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ImageMagick is an open source image editing software suite for displaying, converting, and editing raster image files. It supports read/write for more than 100 image file formats.

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I have a 24-bit RGB (not RGBA) grayscale image representing a barcode, which I need to process as follows from the command line: Add alpha channel Convert any of the color channels to alpha (doesn't …
asked Oct 11 '15 by Bogdan Stăncescu
1
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Ok, after a few good hours of fiddling with this I ended up with a solution: convert template.tif ( barcode.png barcode.png -negate -alpha off -compose copy_opacity -composite -colorspace CMYK +leve …
answered Oct 12 '15 by Bogdan Stăncescu