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How to dye all elements of an image (besides the transparent background) White?

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I have a transparent-backgrounded colorful raster-image (.png).

I want everything in the image to just become White (besides the background, which should stay transparent).

Is there any single action to do that?

In "single action" I mean that I don't want to check elements with a "magic wand" and dye them White, rather, everything which isn't the background would just become White in one go.

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How about copying the alpha channel / transparency mask? (2 comments)

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In the menu bar, select Colors.

  1. Enter Hue-Chroma and maximize lightness; or
  2. Enter Colorize and maximize lightness.
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