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t-mat/image-magick-color-separation-and-compose.md

Last active January 12, 2025 21:39
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ImageMagick basics: color component separation and compose
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image-magick-color-separation-and-compose.md

Separate each color component, save them as a PNG32 (R8G8B8A8).

magick input.png -channel R -separate PNG32:component_r.png
magick input.png -channel G -separate PNG32:component_g.png
magick input.png -channel B -separate PNG32:component_b.png
magick input.png -channel A -separate PNG32:component_a.png

Reconstruct a image from separated components, save it as a PNG32.

magick component_r.png \
       component_g.png -compose CopyGreen -composite \
       component_b.png -compose CopyBlue  -composite \
       component_a.png -alpha off -compose CopyAlpha -composite \
       PNG32:reconstruct.png
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