My problem is so general, and there are version-dependent plug-ins for the problem not working with my version. I also found workarounds that are not the correct solutions.
I would to convert my image’s white to transparency, i.e. decompose gray to black and transparent. It would be correct if I could use the saturation value of the pixel from the HSB (de)composition, make every pixel’s saturation to 100% from it’s original s(x,y) value, and add a 100% – s(x,y) transparency to the pixel.
As the mentioned and many other workaround suggest, using the image itself as an alpha channel is not a solution. E.g. if the pixel is 20% white and 80% gray, and you apply a 20% transparency, then the pixel will look look like 80% – 0.8*0.2 = 56% black instead of 80%.
Another stackexchange question on turning white to transparent is similar to my problem but as I understand, it does not cover my problem. In case if I’m wrong I’d appriciate if someone enlight me how to apply that for my scenario.
Answer
I know you asked how to do this in Photoshop, but this may be one of the few cases (now that Photoshop has content-aware fill too) where GIMP does the job better. So my suggested solution would be:
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Download and install GIMP. (Scroll down for the Windows installer.)
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Open your image in GIMP.
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Use the Color to Alpha tool to convert white to transparent (masking and tweaking as needed, if you want to retain some non-transparent white in the result).
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Save the resulting image and reopen it in Photoshop.
Note: GIMP can import and export Photoshop .psd files, but some information may be lost during the back-and-forth conversion. It may be safer to only edit your PSD files in Photoshop, and to use the PNG format for transferring images between Photoshop and GIMP instead.
Attribution
Source : Link , Question Author : DanielTuzes , Answer Author : Community
