![]() If you want to have your image background transparent, you need an alpha channel. Create a duplicate layer by selecting the Duplicate Layer button on the bottom-right of the screen. This tool is dedicated to background removal or alteration, asking for little input from the user. Here’s how it works: Open your image on GIMP. ![]() In my example image of my Cephalotus follicularis, also known as the Australian Pitcher Plant, it would take a very long time to get a perfect outline around the entire plant using the Eraser tool to do it all by hand. Now press Delete to remove the background. Another reason why your eraser may not be erasing to transparency is because you have anti erase enabled in the tool settings. You don’t have to use the Eraser tool in order to get a transparent background in GIMP. Other Methods for Erasing to Transparency So in addition to R, G, and B, the alpha channel gives your pixels information about transparency to work with. There are also some filters that can cause GIMP to add an alpha channel, such as the Color to Alpha filter, which automatically turns all the pixels of a specific color into transparent pixels.Īdditionally, some image types like the PNG format, which is most commonly used for transparent images, may automatically include an alpha channel although JPEGs and other common file types may need to have one explicitly added. ![]() You will see transparency after erasing the background of this image or any particular area of this image. Whenever you create a new layer that has been filled with transparency, GIMP will automatically add an alpha channel to your image in order to handle the new transparent layer. Just go to the layer menu and click on it, then go to the Transparency option of the drop-down list and click on the 'Add Alpha Channel' option of the new drop-down list. In the layers panel we can see that the font changes from bold to normal. There are also a couple of other situations where GIMP might automatically add an alpha channel for you. Go to layer, transparency and hit add alpha channel. If you find that you’re working on an image that already has an alpha channel, you won’t need to bother with adding another one, and you can just skip right to Step 2 and start erasing to transparency right away. Click and drag to start erasing, and you’ll automatically be erasing to transparency! You will usually choose the type of background removal after you pick the image. Step 2: Switch to the Eraser tool using the toolbox or by pressing the keyboard shortcut Shift+ E. (To explain, all layers in Gimp, including the background, already have transparency, so you are simply letting that show through by selecting and clearing.The Channels panel now has four channels instead of the standard RGB You can click on the eye in the layers window to flip it on and off. ![]() You may find it helpful to create a new layer, paint it some color that varies from the original paper (paint bucket tool will do), then drag your imported scan layer over that in the layers window, to better see the results (that is, those potential stray marks). click on the white background, then Edit->Clear. You may need to play with the threshold to keep faint pencil lines and such from saying in, but you can always touch up later with the eraser tool. Try the Select By Color tool (the finger pointing at colored buttons). Eraser (SHIFT-E) The Eraser will make pixels transparent, or, if it is used on a layer without alpha channel, the pixels will turn to the current background. ![]()
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