Calibrate Macbeth: a Nuke tool to calibrate an image containing a Macbeth ColorChecker chart by calculating a ColorMatrix node that conforms it to a specified colorspace gamut.

README.md

CalibrateMacbeth

A Nuke tool to calibrate an image containing a Macbeth ColorChecker chart by calculating a ColorMatrix node that conforms it to a specified colorspace gamut.

About

Calibrate an image containing a macbeth colorchecker chart to match the gamut of the given colorspace. Requires the numpy python module. Make sure it is importable in nuke. You can enable "use system python path" if you have it installed in a system directory (currently linux only).

Usage

• Align cornerpin to match patches to macbeth chart
• Set sample size to get a good sample on source macbeth chart.
• Choose target colorspace.
• Disable calibrate chromaticities only if you want to adjust exposure as well.
• Click calculate
• Evaluate results: Output in compare mode to get a better view.
• Toggle bypass matrix to compare before/after.
• Click Create MTX to create a new colormatrix node
• Or click Set Selected to set an existing colormatrix node.

Information

Based on Marco Meyer's mmColorTarget tool. www.marcomeyer-vfx.de

Changes

• Rebuild and simplify.
• Add option for ColorChecker2014 in addition to ColorChecker2005.
• calibrate to known gamuts only.
• Add option to not change exposure when calculating calibration.
• Created by Jed Smith - gist.github.com/jedypod

CalibrateMacbeth.nk

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version 14.0 v2
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Group {
 name CalibrateMacbeth
 tile_color 0x87aee7ff
 selected true
 xpos 197
 ypos -199
 addUserKnob {20 CalibrateMacbeth}
 addUserKnob {26 macbeth_position_label l "@b;Macbeth Position" T ""}
 addUserKnob {7 sample_size l "sample size" R 5 100}
 sample_size 50
 addUserKnob {12 TL}
 TL {820 1070}
 addUserKnob {12 TR -STARTLINE}
 TR {1155 1105}
 addUserKnob {12 BL}
 BL {828 756}
 addUserKnob {12 BR -STARTLINE}
 BR {1174 782}
 addUserKnob {6 output_compare l "output in compare mode" t "inverts the cornerpin for a good view of the macbeth chart for comparing src and dst" +STARTLINE}
 addUserKnob {6 disable_overlay l "disable overlay" t "Removes the destination colorchecker values overlayed over the source." +STARTLINE}
 addUserKnob {26 ""}
 addUserKnob {41 gamut T MacbethColorChecker.gamut}
 addUserKnob {6 chroma_only l "calibrate chromaticities only" t "Do not change the brightness of the input image after calibration." +STARTLINE}
 chroma_only true
 addUserKnob {22 calculate l Calculate T "from __future__ import print_function\nimport nuke\n\ndef colorsample(node, pos, size):\n    # sample rgb pixel value\n    # :param: node - node object to sample\n    # :param: pos - list containing x and y position as float values\n    # :param: size - box size to average in sample\n    return \[node.sample(chan, pos\[0], pos\[1], size, size) for chan in \['red', 'green', 'blue']]\n\n\ndef calc_mtx():\n    # calculate colormatrix to match src macbeth chart to dst macbeth chart\n    node = nuke.thisNode()\n\n    # make sure numpy is importable\n    if node\['specify_python_path'].getValue():\n        import sys\n        sys.path.insert(0, node\['python_path'].getValue())\n    try:\n        import numpy as np\n    except ImportError as e:\n        nuke.message('numpy required. make sure it is installed correctly and importable.\\n\{0\}'.format(e))\n        return\n\n    size = node\['sample_size'].getValue()\n    chroma_only = node\['chroma_only'].getValue()\n    \n    node.begin()\n    src = nuke.toNode('Normalize')\n    dst = nuke.toNode('macbeth_points')\n    norm_node = nuke.toNode('Normalize')\n\n    node\['reset'].execute()\n\n    # If chroma_only, normalize colorchecker to dst grey before sampling\n    if chroma_only:\n        src_grey = colorsample(src, dst\['p44'].getValue(), size)\n        dst_grey = colorsample(dst, dst\['p44'].getValue(), size)\n        \n        # with rec709 luminance weighting\n        src_lum = (src_grey\[0]*0.2126 + src_grey\[1]*0.7152 + src_grey\[2]*0.0722)\n        dst_lum = (dst_grey\[0]*0.2126 + dst_grey\[1]*0.7152 + dst_grey\[2]*0.0722)\n        norm_node\['src'].setValue(src_lum)\n        norm_node\['dst'].setValue(dst_lum)\n\n        print('source grey: \{0\} | \{1\}\\ndst grey: \{2\} | lum: \{3\}'.format(src_grey, src_lum, dst_grey, dst_lum))\n    \n    src_patches = list()\n    dst_patches = list()\n    points = \['p11', 'p12', 'p13', 'p14', 'p15', 'p16', 'p21', 'p22', 'p23', 'p24', 'p25', \n        'p26', 'p31', 'p32', 'p33', 'p34', 'p35', 'p36', 'p41', 'p42', 'p43', 'p44', 'p45', 'p46']\n\n    for point in points:\n        src_value = colorsample(src, dst\[point].getValue(), size)\n        dst_value = colorsample(dst, dst\[point].getValue(), size)\n\n        src_patches.append(src_value)\n        dst_patches.append(dst_value)\n\n        print('source: \{0\}'.format(src_value))\n        print('destination: \{0\}'.format(dst_value))\n\n    # Calculate multivariate Rinear Regression to fit source matrix to target matrix\n    # https://en.wikipedia.org/wiki/General_linear_model\n    # https://docs.scipy.org/doc/numpy/reference/generated/numpy.linalg.lstsq.html\n    # \n    # https://github.com/colour-science/colour-nuke/blob/master/colour_nuke/notebooks/mmColorTarget_dependencies.ipynb\n    # Source chromaticities are based on XRite ColorChecker 2005 values as described here: \n    # https://github.com/colour-science/colour/blob/cdbffd063b0c44bb32d752b01647137871434851/colour/characterisation/dataset/colour_checkers/chromaticity_coordinates.py#L114-L114\n    # http://www.babelcolor.com/colorchecker.htm\n    # http://www.babelcolor.com/colorchecker-2.htm#CCP2_beforeVSafter\n    # https://github.com/colour-science/colour-nuke/blob/master/colour_nuke/scripts/colour_rendition_chart.nk\n\n    np_matrix = np.transpose(np.linalg.lstsq(np.array(src_patches), np.array(dst_patches))\[0])\n    matrix = np.ravel(np_matrix).tolist()\n    node\['matrix'].setValue(matrix)\n    nuke.root().begin()\n\nif __name__=='__main__':\n    calc_mtx()" +STARTLINE}
 addUserKnob {26 ""}
 addUserKnob {26 output_matrix_label l "@b;Output Matrix" T ""}
 addUserKnob {41 matrix T ColorMatrix.matrix}
 addUserKnob {6 bypass_mtx l "bypass matrix" t "disable the matrix - for comparing before/after" +STARTLINE}
 addUserKnob {22 reset l Reset -STARTLINE T "n = nuke.thisNode()\nn\['matrix'].setValue(\[1,0,0,0,1,0,0,0,1])\nn.begin()\nnorm = nuke.toNode('Normalize')\nnorm\['src'].setValue(0.18)\nnorm\['dst'].setValue(0.18)"}
 addUserKnob {22 create_mtx l "Create MTX" t "Create a ColorMatrix node." T "import os\nnode = nuke.thisNode()\nnode.begin()\nnorm = nuke.toNode('Normalize')\n\nnuke.root().begin()\n_ = \[n.setSelected(False) for n in nuke.allNodes(recurseGroups=True)]\n\ncolormatrix = nuke.createNode('ColorMatrix')\ncolormatrix.setXYpos(node.xpos()-120, node.ypos())\ncolormatrix\['matrix'].setValue(node\['matrix'].getValue())\ntopnode = nuke.toNode(nuke.tcl('full_name \[topnode \{0\}]'.format(node.fullName())))\nif 'file' in topnode.knobs():\n\tfilename = os.path.basename(topnode\['file'].getValue())\nelse:\n\tfilename = topnode.name()\nif node\['chroma_only'].getValue():\n    colormatrix\['label'].setValue('\{0\} \\ncalibrate: \{1\}'.format(filename, node\['colorspace'].value()))\n    # Create mult as well for optional exposure adjustment\n    exp = nuke.createNode('Multiply')\n    exp\['channels'].setValue('rgb')\n    exp.setXYpos(colormatrix.xpos(), colormatrix.ypos() + 60)\n    exp\['value'].setValue(norm\['value'].getValue())\n    colormatrix.setSelected(True)\nelse:\n    colormatrix\['label'].setValue('\{0\} \\ncalibrate w/ exposure: \{1\}'.format(filename, node\['colorspace'].value()))" +STARTLINE}
 addUserKnob {22 set_selected l "Set Selected" t "Set matrix knob on selected node." -STARTLINE T "node = nuke.thisNode()\nnuke.root().begin()\n\ncolormatrix = nuke.selectedNode()\nif 'matrix' in colormatrix.knobs():\n    colormatrix\['matrix'].setValue(node\['matrix'].getValue())\n"}
 addUserKnob {20 info l Info}
 addUserKnob {26 info_label l "" +STARTLINE T "<b>About</b><br/>\nCalibrate an image containing a macbeth colorchecker chart<br/>\nto match the gamut of the given colorspace.<br/>\nRequires the numpy python module. Make sure it is importable<br/>\nin nuke. You can enter a custom python path to search for numpy.<br/>\nThis is the directory to the site-packages folder that contains the numpy module.<br/><br/>\nNote that this technique is not a magic solution. <br/>\nIn order for the calibration to be accurate, the illuminant in the scene<br/>\nneeds to be CIE Illuminant D65. The more the spectral power distribution <br/>\nof the light varies from this, the more error will be in the result.\n<br/><br/><b>Usage</b><br/>\n- Align cornerpin to match patches to macbeth chart <br/>\n- Set sample size to get a good sample on source macbeth chart. <br/>\n- Choose target colorspace. <br/>\n- Disable calibrate chromaticities only if you want to adjust exposure as well.<br/>\n- Click calculate<br/>\n- Evaluate results: Output in compare mode to get a better view.<br/>\n- Toggle bypass matrix to compare before/after.<br/>\n- Click Create MTX to create a new colormatrix node<br/>\n- Or click Set Selected to set an existing colormatrix node.<br/>\n\n<br/><br/><b>Information</b><br/>\nBased on Marco Meyer's mmColorTarget tool.<br/>\nwww.marcomeyer-vfx.de<br/>\n<br/>\nRebuild and simplify. <br/>Calibrate to known gamuts only. <br/>\nAdd option to not change exposure.<br/>\nCreated by Jed Smith - <a href=\"gist.github.com/jedypod\">gist.github.com/jedypod</a>"}
 addUserKnob {26 ""}
 addUserKnob {6 specify_python_path l "" t "search specified python path for numpy module" -STARTLINE}
 specify_python_path true
 addUserKnob {1 python_path l "python path" t "enter the directory of the site-packages folder that contains the numpy module" -STARTLINE}
 python_path /opt/sidefx/hfs19.0.455/python/lib/python3.7/site-packages
}
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 Reformat {
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  box_fixed true
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  label "\[value gamut]"
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  addUserKnob {20 MacbethColorChecker_tab l MacbethColorChecker}
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  gap 10
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    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name moderate_red
    xpos 290
    ypos -201
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.2915036416 0.188999956 0.09736350318 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "moderate red"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 9
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name purplish_blue
    xpos 180
    ypos -201
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.1200518326 0.1091090233 0.2874447494 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "purplish blue"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 8
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name orange
    xpos 74
    ypos -201
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.4073691399 0.3126416159 0.05130591012 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob orange
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 7
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name cyan
    xpos 622
    ypos -81
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.1247966941 0.180609913 0.2913392383 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob cyan
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 18
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name magenta
    xpos 512
    ypos -81
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.299122798 0.1895114577 0.2213469194 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob magenta
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 17
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name yellow
    xpos 399
    ypos -81
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.5888922356 0.5992976803 0.07077420003 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob yellow
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 16
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
     xpos 262
     ypos 125
    }
    Output {
     name Output
     xpos 262
     ypos 182
    }
   end_group
   Group {
    inputs 0
    name red
    xpos 292
    ypos -81
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.2143728424 0.127800835 0.03868150726 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob red
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 15
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name green
    xpos 182
    ypos -81
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.1413517689 0.2233437582 0.07287461742 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob green
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 14
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name blue
    xpos 72
    ypos -81
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.06809095613 0.05596214063 0.2077405936 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob blue
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 13
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name black_2
    xpos 623
    ypos 39
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.03042544265 0.03151319431 0.02656724434 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "black 2 (1.5 D)"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 24
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
     xpos 262
     ypos 125
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name neutral_3
    xpos 512
    ypos 39
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.08448968042 0.08817234828 0.07391630753 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "neutral 3.5 (1.05 D)"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 23
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name neutral_5
    xpos 403
    ypos 39
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.1835495863 0.1906228754 0.1566717383 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "neutral 5 (.70 D)"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 22
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name neutral_6
    xpos 292
    ypos 39
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.3495921991 0.3648652066 0.3013565492 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "neutral 6.5 (.44 D)"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 21
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name neutral_8
    xpos 179
    ypos 39
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.5665335579 0.5899709702 0.4828473821 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "neutral 8 (.23 D)"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 20
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   Group {
    inputs 0
    name white_9
    xpos 70
    ypos 39
    postage_stamp true
    addUserKnob {20 sample_Tab l Sample}
    addUserKnob {19 colour_RGBA_Color_Knob l Colour}
    colour_RGBA_Color_Knob {0.8436985288 0.8806903203 0.6936778752 1}
    addUserKnob {6 colour_RGBA_Color_Knob_panelDropped l "panel dropped state" -STARTLINE +HIDDEN}
    addUserKnob {1 name_Text_Knob l Name}
    name_Text_Knob "white 9.5 (.05 D)"
    addUserKnob {1 index_Text_Knob l Index}
    index_Text_Knob 19
    addUserKnob {3 resolution}
    resolution {{parent.patch_resolution}}
   }
    Constant {
     inputs 0
     color {{parent.colour_RGBA_Color_Knob.r} {parent.colour_RGBA_Color_Knob.g} {parent.colour_RGBA_Color_Knob.b} {parent.colour_RGBA_Color_Knob.a}}
     format "512 512 0 0 512 512 1 square_512"
     name Constant
     xpos 262
     ypos 53
    }
    Reformat {
     type "to box"
     box_width {{parent.resolution}}
     box_height {{parent.resolution}}
     box_fixed true
     filter impulse
     black_outside true
     name Reformat1
     xpos 262
     ypos 134
    }
    Output {
     name Output
     xpos 262
     ypos 173
    }
   end_group
   ContactSheet {
    inputs 24
    width {{"rint(parent.patch_resolution * 6 + gap * 7)"}}
    height {{"rint(parent.patch_resolution * 4 + gap * 5)"}}
    rows 4
    columns 6
    startframe 1
    endframe 1
    name ContactSheet
    xpos 620
    ypos 206
   }
   Output {
    name Output
    xpos 620
    ypos 326
   }
  end_group
  ColorMatrix {
   matrix {
       {0.9598786831 -0.0293238461 0.06578332186}
       {-0.02120095305 0.9988456964 0.02618063986}
       {0.001372883562 0.004445131868 1.313236713}
     }
   name ColorMatrix
   label "D50 to D65 - CAT02"
   note_font Helvetica
   xpos 1170
   ypos -327
  }
  Group {
   name XYZD65ToGamut
   tile_color 0x429940ff
   xpos 1170
   ypos -274
   cached true
   addUserKnob {20 InputGamut_to_XYZ_tab l InputGamut_to_XYZ}
   addUserKnob {4 gamut M {ACES ACEScg P3D65 Rec.2020 Rec.709 "Arri WideGamut 3" "Arri WideGamut 4" "Red WideGamut RGB" "Sony SGamut3" "Sony SGamut3.Cine" "Panasonic V-Gamut" "Blackmagic Wide Gamut" "Filmlight E-Gamut" "DaVinci Wide Gamut"}}
   gamut ACEScg
   addUserKnob {41 matrix T ColorMatrix.matrix}
   addUserKnob {41 invert -STARTLINE T ColorMatrix.invert}
  }
   Input {
    inputs 0
    name Input
    xpos 290
    ypos -610
   }
   Dot {
    name Dot1
    xpos 324
    ypos -546
   }
set N1421d3c0 [stack 0]
   ColorMatrix {
    matrix {
        {{"SwitchGamut.input\[value SwitchGamut.which].matrix"} {"SwitchGamut.input\[value SwitchGamut.which].matrix"} {"SwitchGamut.input\[value SwitchGamut.which].matrix"}}
        {{"SwitchGamut.input\[value SwitchGamut.which].matrix"} {"SwitchGamut.input\[value SwitchGamut.which].matrix"} {"SwitchGamut.input\[value SwitchGamut.which].matrix"}}
        {{"SwitchGamut.input\[value SwitchGamut.which].matrix"} {"SwitchGamut.input\[value SwitchGamut.which].matrix"} {"SwitchGamut.input\[value SwitchGamut.which].matrix"}}
      }
    name ColorMatrix
    xpos 290
    ypos -370
   }
   Output {
    name Output
    xpos 290
    ypos -250
   }
push $N1421d3c0
   Dot {
    name Dot391
    label " XYZ D65 to *RGB -- CAT02"
    xpos 434
    ypos -546
   }
set N14235070 [stack 0]
   ColorMatrix {
    matrix {
        {1.516672042 -0.2814780479 -0.1469636332}
        {-0.4649171012 1.251423776 0.1748846089}
        {0.06484904707 0.1091393437 0.7614146215}
      }
    name ColorMatrix4
    label "XYZ D65 to DaVinci Wide Gamut"
    xpos 1830
    ypos -471
   }
push $N14235070
   ColorMatrix {
    matrix {
        {1.52505277 -0.3159135109 -0.1226582646}
        {-0.50915256 1.333327409 0.1382843651}
        {0.09571534531 0.05089744385 0.7879557703}
      }
    name ColorMatrix3
    label "XYZ D65 to Filmlight E-Gamut"
    xpos 1720
    ypos -471
   }
push $N14235070
   ColorMatrix {
    matrix {
        {1.866357736 -0.5183905088 -0.2346067165}
        {-0.6003298545 1.378119951 0.1767281098}
        {0.002451481064 0.08638160934 0.8367677153}
      }
    name ColorMatrix15
    label "XYZ D65 to Blackmagic Wide Gamut"
    xpos 1610
    ypos -471
   }
push $N14235070
   ColorMatrix {
    matrix {
        {1.589011774 -0.3132044845 -0.1809648515}
        {-0.5340529104 1.396011433 0.102457671}
        {0.01117944884 0.003194128241 0.9055353563}
      }
    name ColorMatrix14
    label "XYZ D65 to Panasonic V-Gamut"
    xpos 1500
    ypos -471
   }
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push $N14235070
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push $N14235070
   ColorMatrix {
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push $N14235070
   ColorMatrix {
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push $N14235070
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push $N14235070
   ColorMatrix {
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    which {{gamut}}
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 Dot {
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  name CornerPin2D1
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  box_height {{input.to3.y}}
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 Dot {
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  to4 {{parent.TL} {parent.TL}}
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  from3 {{input.width} {input.height}}
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 Output {
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 Multiply {
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  ypos -1042
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  addUserKnob {7 dst R 0 4}
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  addUserKnob {20 macbeth_points}
  addUserKnob {12 p11}
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  addUserKnob {12 p12}
  p12 {{"(input.width / 6) * 2 - (input.width / 12)"} {"(input.height / 4) * 4 - (input.height / 4 / 2)"}}
  addUserKnob {12 p13}
  p13 {{"(input.width / 6) * 3 - (input.width / 12)"} {"(input.height / 4) * 4 - (input.height / 4 / 2)"}}
  addUserKnob {12 p14}
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  addUserKnob {12 p15}
  p15 {{"(input.width / 6) * 5 - (input.width / 12)"} {"(input.height / 4) * 4 - (input.height / 4 / 2)"}}
  addUserKnob {12 p16}
  p16 {{"(input.width / 6) * 6 - (input.width / 12)"} {"(input.height / 4) * 4 - (input.height / 4 / 2)"}}
  addUserKnob {26 ""}
  addUserKnob {12 p21}
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  addUserKnob {12 p22}
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  addUserKnob {12 p23}
  p23 {{"(input.width / 6) * 3 - (input.width / 12)"} {"(input.height / 4) * 3 - (input.height / 4 / 2)"}}
  addUserKnob {12 p24}
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  addUserKnob {26 ""}
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  addUserKnob {12 p33}
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  addUserKnob {12 p46}
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 }
end_group

CalibrateMacbeth_screenshot.jpg

hi this looks awesome but how do i make numpy importable to nuke? cant find anything on the internet about this at all :( i dont know anything about python at all.

hi this looks awesome but how do i make numpy importable to nuke? cant find anything on the internet about this at all :( i dont know anything about python at all.

Hi Emartin8907
you need to copy the numpy directory into the directory Nuke11\pythonextensions\site-packages
I dont think it works if you copy from the python\lib\site-packages as numpy is compiled in windows with different binaries.
So copy the Houdini's numpy .... Program files\Side Effects Software\Houdini 18.0.348\python27\lib\site-packages\numpy
into Nuke11\pythonextensions\site-packages
(if you dont have Houdini, install the trial version and grab numpy from there)

Hey all,
Sorry for missing your message before @emartin8907.

I've pushed an update to the tool which might help. It's a custom python path knob. If you enter the path to the site-packages folder containing your numpy module, theoretically it will work.

Hope it helps!

Did a small update for python3 compatibility...

This is great! I can use it in Nuke Indie! One bug is that the Create Matrix button gives a NoneType error. I think the variable is being set to nuke.createNode() which is giving a NoneType output for some reason.

Is there a way to also use the color chart to estimate the gamma of a given frame? What's most important to me is matching the color gamma, as that is very important to the integrity of an aces workflow.

Hey @PinPointPing! Good to know about Nuke Indie support / behavior.

As for linearity: It is absolutely critical that the input image data is scene-linear. If it's not all bets are off.

If you are working with gamma-encoded or even worse display-referred footage, I would first take a look at how you can avoid this situation and work with scene-linear images instead. Otherwise your results will most likely be very poor.

Thanks for this great tool, @jedypod! I've just had a show that was using REDWideGamutRGB and noticed that this particular colorspace is missing even though the large stickynote inside makes mention of it. It wasn't a problem to convert everything to a supported gamut but in case you are still developing this tool, REDWideGamutRGB might be a useful addition.

@tiltX Thanks, it's been on my list forever to scrap that massive list of useless colorspaces with something more reasonable and modern. (When's the last time you used Ekta Space PS 5?) I just pushed an update which hopefully improves the situation.

I have nuke 14.0v3 and i am assigning numpy path from Houdini 19.50403-Py3.9 but when i hit calibrate, i get the following error in nuke:

module 'numpy' has no attribute 'transpose'

Can you point me to what i might be doing wrong?