For the color-based selection methods, I will demonstrate with this Imagy.app logo that I want to remove the blue background from.įor the more complex selection options, I have opened this Focus photography of grey dog image from Unsplash. To remove the background, you must open the image you want to work on in GIMP. There are also two ways to remove the background, one is destructive, and you can’t retrieve the background later on, while the other is non-destructive and hides the background, so you can bring it back later if needed. You can try out the different selection options to see which works best for your image or graphic. When it comes to removing a background and making it transparent in GIMP, there are a few ways to go about it, and the method you choose depends on how simple or complex the image you are working with is. Step-by-Step of How to Remove a Background in GIMP Delete the background or add a layer mask.Select the areas to remove using a selection tool.Overview of How to Make a Background Transparent Delete the Background or Add a Layer Mask.Select the Areas to Remove Using a Selection Tool.Step-by-Step of How to Remove a Background in GIMP.Overview of How to Make a Background Transparent.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. The pixels inside the subject, bieng excluded from the selection, won't be altered. 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. On CGI (logos, text), the smooth edges are produced with anti-aliasing pixels.
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