![]() Use the wand to select the background.So if you apply the technique above these parts become transparent (or partially transparent). In the general case, the subject may have parts that are close to the color of the background. Gimp 2.10 works in "linear light" and has no such problems. You will notice that in the 2.8 results, there are darker pixels that are due to Gimp 2.8 working on gamma-corrected values (the result is still vastly better than the jagged edges you get with simpler methods). If you remove white from gray, you get a very transparent black pixel and not a not-so-transparent dark gray pixel, because among several solution Gimp picks the most transparent one.įor instance, using Color-to-alpha to remove the red gives this: If you remove red from purple, you get a semi transparent blue, because semi-transparent blue over red produces purple. They both replace the pixel by the most transparent pixel, which, put over the removed color, re-produces the initial color. Color erase mode, as a paint tool mode, or since Gimp 2.10 as a layer blend mode.In Gimp there are two ways to achieve this: The good solution is to replace the background color by transparency, in proportion of its contribution to the color mix. If you then bluntly Delete, you either get a halo with the color of the removed background (Threshold 15) or a jagged edge (Threshold 100) or both: When you use the color selector or the fuzzy selector, these pixels are either selected fully (if they are close enough) or not at all, depending on threshold. These pixels have a color which is a mix of the background color and the subject color. On CGI (logos, text), the smooth edges are produced with anti-aliasing pixels. ![]()
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