Tried to replace all colors except yellow (with some -fuzz) to transparent without result. Didn't find anything in documentation maybe someone can help me.
Thank you.
As I know in ImageMagic there is +opaque, but I can't use this library
GraphicsMagick replace all colors (except yellow) to transparent
884 Views Asked by Oleksandr Dakal At
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This should do what you want. It makes the yellow pixels transparent and then inverts the alpha channel.
The "+matte" removes any existing transparency that might be in the input.png, then "-matte" adds an opaque alpha channel.
Tested with GraphicsMagick-1.3.20.