![]() 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. Step 1: Launch GIMP and open the image whose background you want to change from File > Open. If the image is dirty (JPEG artifacts), growing the selection by two or three pixels can be necessary. Method 1: Use the Eraser Tool to Change Image Background. 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. However, one can also use the eyedropper tool to pick a colour from anywhere on the desktop.On CGI (logos, text), the smooth edges are produced with anti-aliasing pixels. Here, I used f3f3e9 as a background colour for plain colour filling. Click on the background colour rectangle in the upper half of the Tool Options toolbox window to change the background colour. We can create transparent images in sophisticated programs such as GIMP. (In this respect, Adobe Photoshop is no different.) Hence, choose a colour which is compatible with the background on which the resulting picture will eventually be used. There is a lot we can do with image processing software and we will cover some. ![]() Once selected, click the portion of the image you want to be transparent. Select the 'Selects regions by color' tool or press Shift + O. Some colour mixing will be inevitable and even desired. GIMP Open GIMP and create a new file or open an existing one. Do select BG colour fill and Sample merged and run a few tries while adjusting Threshold for best results. Within the Bucket Fill toolbox options, select Fill transparent areas only when necessary. Select the bucket fill tool or hit Shift+ B. The next step is optional and consists in filling the area that should become transparent with a plain colour first. This is done by selecting Layer → Tranparency → Add Alpha Channel. If this is the case, add an alpha transparency channel. Some image types lack a transparency channel JPG for example. La trahison des images by fellow countryman René Magritte partly vandalised for the purpose of this tutorial.
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