![]() ![]() However, one can also use the eyedropper tool to pick a colour from anywhere on the desktop. Here, I used f3f3e9 as a background colour for plain colour filling. The Color to Alpha command makes transparent all pixels of the active layer that have a selected color. Click on the background colour rectangle in the upper half of the Tool Options toolbox window to change the background colour. Be sure to set threshold 0.0 Now that you have the selection, use the Color to alpha tool, and use the eyedropper (after double clicking the 'from' color) to select your color. Kevin Cozens 19:35:56 UTC (about 15 years ago) batch mode in gimp, add alpha, change color Choi, JiHui wrote: I want to do some doing on my many images, about 1,000 at first, add alpha channel at each image, and change color fff to transparent. Use the Select by Color tool to isolate the color. This powerful tool is particularly useful for creating logos, icons, and other graphics with transparent. One of its notable features is 'Color to Alpha,' which allows users to remove a specific color from an image and replace it with transparency. ![]() (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. Create a new, transparent layer at the bottom of the layer stack. GIMP (GNU Image Manipulation Program) is a powerful open-source image editing software widely used by professionals and enthusiasts alike. Some colour mixing will be inevitable and even desired. 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 reason why I want to know how to use this function from a command line is to apply the function to many images in a single click without having to open each image one by one in gimp. The next step is optional and consists in filling the area that should become transparent with a plain colour first. I am trying to reproduce the color-to-alpha function gimp offer, which adds a level of transparency depending on the amount of color in a pixel. 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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