Uncheck Show Layer Mask to see the transparency applied. Rapidly declining to the left, causing most of the bright pixels toīecome completely white (ie. In the Curves dialog, make the curve flat along the top & then.If you omit this, you can see the transparency Optional: right-click "image" and Show Layer Mask (should show you The previous steps are possibly identical to the single command "Color to Alpha".Paste it onto the Alpha channel of "image" (click on the right thumbnail Copy all of "image alpha" (in "image alpha" layer, Select All & Copy).Right-click the "image" layer and Add Alpha (if not already done).Duplicate the "image" layer to a new layer called "image alpha" (with the Duplicate Layer button in the Layers Dialog).Starting with a layer with the original image on it called "image".In a nutshell I copied a grayscale version of the original image into it's Layer Mask/Alpha Channel, and then used Curves on the Alpha Channel to make most of the image opaque while adjusting how translucent the edges should be. Here's a useful GIMP technique I recently used for this - probably similar to "Color To Alpha" (Color To Alpha was greyed out for me, even though I was in RGB mode), but this method gave me some useful customization for how "soft" i wanted the edges to come out (as opposed to magic wand techniques which leave a thin black border around the image, rather than making the edges partially transparent).
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