![]() Gimp 2.10 supports it, but you have to ensure that it is supported where you want to use it (it won't be supported in older browsers, for instance). WEBP is a new Google-sponsored format that can be lossy or lossless, and supports partial transparency.PNG has full support for partial transparency and is currently the preferred format.You can use `Layer>Transparency>Semi-flatten to fill the transparency of these edge pixels with a new color (the color of the background on which the GIF will be used). GIF supports binary transparency (all opaque or all transparent) so your semi-transparent edge pixels are going to be altered.Color to alpha will be applied to the background and the edge pixels, where it matters. You can do this by clicking its icon (which looks like a magic wand) in the toolbar. Click on Add Alpha Channel here this will allow you to keep the background transparent after removing the unwanted background. The pixels inside the subject, bieng excluded from the selection, won't be altered. Begin by right-clicking on the image layer to open its menu. If the image is dirty (JPEG artifacts), growing the selection by two or three pixels can be necessary. On a clean image (PNG, with no JPG history) you don't need to grow by more than one pixel. Select>Grow the selection so that it covers the anti-aliasing pixels.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. by 1 or 2px, and then use the color to alpha filter with White on this selection.On CGI (logos, text), the smooth edges are produced with anti-aliasing pixels. ![]() If you get aliased borders, then, after edit>cut, but prior to dismissing your selection, you can do Select->Border. (It won't work if your image layer does not have transparency to start with - if that is the case, prior to edit->cut do Layer->Transparency->Add Alpha Channel). To simply remove the white, you have to cick on the Select By Color tool (by default th 5th icon on the toolbox), click on the white background to have it selected, and then just edit->cut. Thus, in your case, it removed the "whiteness" of your chair, transforming all pixels to different opaque shades of black - so that when placed over white, you get the original image. Second, it is trivial enough just to answer: the color to alpha plug-in is not there to turn a single color, as seem on the image, to transparency: it is a sophisticated plug-in that will remove one color of your image in a way that, if you lace the new image over a background of the same color the color you removed, you get the original image back. ![]() First, this question is offtopic here, and should be on. ![]()
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