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dymio/Gradient map with ImageMagick

Created June 3, 2014 14:31
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Gradient map with ImageMagick
#!/bin/sh
# Imagemagick analogue of Adobe Photoshop Gradient map with 75% opacity on it
# you will need the input.jpg file with original color image
# and gradient_line.png file with 256 x 1 px image of gradient
# make image grayscale
convert input.jpg -colorspace gray draft.jpg
# apply the gradient lut
convert draft.jpg gradient_line.png -clut draft.jpg
# set 75% opacity
convert draft.jpg -alpha on -channel a -evaluate set 75% draft.png
# impose result image on original image
convert the_in.jpg temp.png -gravity center -composite -format jpg -quality 90 output.jpg
# remove temporary files
rm draft.jpg && rm draft.png
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