Blender: Set Image Scale

image_set_scale.py

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# ##### END GPL LICENSE BLOCK #####

import bpy

bl_info = {
    "name": "Set Image Scale",
    "category": "Image",
    "author": "lucasvinbr (lucasvinbr@gmail.com)",
    "version": "0.1",
    "location": "Image Editor > Tools > Misc > Set Image Scale",
    "description": "It's an interface to the 'image.scale(x,y)' command: it sets the current Image's width and height. The change is lost if the image is reloaded from the source.",
}


from bpy.props import (IntProperty)

from bpy.types import (Operator,
                       Panel,
                       Scene
                       )


class ScaleImageOp(Operator):
    bl_idname = "image.set_scale_image_operator"
    bl_label = "Set Scale"
    
    @classmethod
    def poll(cls, context):
        sima = context.space_data
        
        return (sima and sima.image)
    
    def execute(self, context):
        sima = context.space_data
        curScene = context.scene
        sima.image.scale(curScene.resizeImgWidth, curScene.resizeImgHeight)
        
        
        return {'FINISHED'}


class ScaleImagePanel(Panel):
    """Panel in the Image Tools Tab"""
    bl_space_type = 'IMAGE_EDITOR'
    bl_region_type = 'TOOLS'
    bl_label = "Set Image Dimensions"
    
    
    @classmethod
    def poll(cls, context):
        sima = context.space_data

        return (sima and sima.image)

    def draw(self, context):
        layout = self.layout
        curScene = context.scene
        
        row = layout.row()
        row.label(text="(Save the scaled file to keep the changes!)")
        
        layout.separator()
        
        row = layout.row()
        row.prop(curScene, "resizeImgWidth")
        
        row = layout.row()
        row.prop(curScene, "resizeImgHeight")
        
        row = layout.row()
        row.operator("image.set_scale_image_operator")

#--------------
#REGISTER\UNREGISTER
#--------------

classes = (
    ScaleImagePanel,
    ScaleImageOp
)

def register():
    from bpy.utils import register_class
    for cls in classes:
        register_class(cls)
        
    Scene.resizeImgWidth = IntProperty(name="Scaled Image Width", description="The width the image will have after the scaling process.", default=256, min=1, soft_min=1)
    Scene.resizeImgHeight = IntProperty(name="Scaled Image Height", description="The height the image will have after the scaling process.", default=256, min=1, soft_min=1)


def unregister():
    from bpy.utils import unregister_class
    for cls in reversed(classes):
        unregister_class(cls)
        
    del Scene.resizeImgWidth
    del Scene.resizeImgHeight

if __name__ == "__main__":
    register()