: Reverse engineering a semi-transparent image I want to match the appearance of an image that is partly transparent. The problem is that I cannot obtain the original image. I can only obtain
I want to match the appearance of an image that is partly transparent. The problem is that I cannot obtain the original image. I can only obtain screenshots of it against different backgrounds.
Using images of it against black and white backgrounds, is there a way to derive the original image? Ideally, I'd like to derive the non-transparent version of it, along with its transparency level. I want to edit it, then re-apply the transparency.
I'm working with GIMP 2.6 on Linux, but I could obtain other software as needed.
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Colors>Color to alpha and remove the white (if you think the original background is white). Don't forget to add an alpha channel if necessary
The "contract" of color-to-alpha is that stacking the final image over a layer filled with the removed color will give the starting image. And C2A will always shoot for maximum transparency: over a white background, a grey could be a totally opaque grey or a partially opaque black: Gimp will produce the partially opaque black.
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