Does Photoshop have an equivalent to GIMP’s “Color to Alpha” feature?
Asked 8/26/2010
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2 answers
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In GIMP, the “Color to Alpha” tool can remove a chosen color and turn it into transparency while preserving highlights and shadows. Is there a similar way to do this in Adobe Photoshop, either built in or via a plugin? I’m especially interested in workflows for isolating an object like a bottle from a plain background while keeping partial transparency intact.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
16y ago
2 Answers
9
There is a plugin for Photoshop that can do this, but it's a little ancient and only 32bit. It is, however, free and may do the trick for you.
Originally by user472. Source · Licensed CC BY-SA 4.0
user472
15y ago
0
Generated from our catalog & community — verify before relying on it.
Yes—Photoshop can do something similar, though not as a single built-in tool with the same name. The closest built-in method is Select > Color Range, which lets you sample a color and adjust the range with the Fuzziness slider. That creates a selection you can turn into a layer mask, then refine with normal mask editing tools.
Another useful approach is channel-based masking: Ctrl/Cmd-click a channel to load it as a selection, then create a mask from that selection or delete from the layer. You can further refine the mask by editing it with Levels or Curves for better control over semi-transparent areas.
There is also an older free Photoshop plugin that can do this more directly, but one answer notes it is dated and 32-bit only.
So, yes: Photoshop can achieve a “color to alpha” result, most commonly with Color Range plus masking, or by building the mask from channels.
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