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In standard gimp this functionality is available in Colors - Color to Alpha. Maybe I'm misunderstanding what you're looking for.
by morsch 13y ago
In standard gimp this functionality is available in Colors - Color to Alpha. Maybe I'm misunderstanding what you're looking for.
- tombrossman 13y agoYes white (the default, or any color you set) to transparent is definitely 'Colour to alpha'. Works great and you can repeat for multiple colours in the same image.
- mxfh 13y agoThanks for the hint, just tried it and it not behaving as I need to. Expected behavior in HSL color space would be anything with the same Hue and Saturation value (with optional adjustable thresholds) of a selected color gets assigned an alpha value of 1 - lightness. Where lightness of 1 being white and alpha of 1 being opaque. KillWhite seems to do exactly this: http://mikes3d.com/extra/wp-content/uploads/2010/07/apple.png http://mikes3d.com/extra/wp-content/uploads/2010/07/apple.pn... I guess by now, it's easiest for me to re-implement this as a filter for HTML5 2DCanvas.