![]() File -> Export As -> PNG and click through the dialogs.To access this menu, navigate to Colors > Color to Alpha. This tool allows you to move a single color within an image or a range of similar colors to the alpha channel, which will result in transparency. Either way, the transparent layer should look all chequerboard-y: To make a color transparent in GIMP we’ll be using the Color to Alpha feature. It should automagically choose the background, but if not, click on the colour picker (the eye dropper beside the Color window) and click on the background.Choose Layer -> Transparency -> Colour to Alpha.Choose Layer -> Transparency -> Add Alpha Channel.I like ImageJ, especially if I want to make a black-and-white version, because I can readily switch the image to greyscale then threshold to remove any spots in the background. If it needs cleaning up, use your favourite tool for that.In my case, I viewed the PDF at large size, hit Print Screen, pasted the result into MSPAINT and then cropped. In my case, I am using a photocopier that will email me a PDF version. Select Open from the drop-down menu and select the photo with the layers you want to make transparent from your device. Bung it in the scanner and scan it in colour (greyscale if black pen) at good resolution - say 300dpi. Launch your GIMP app and tap File in the top left corner.First, get a nice clean piece of paper and sign it, generously but not huge, so that the ink-to-white ratio is about right. ![]() If you’ve got more than one layer, select the one you want to fade and adjust the Opacity slider at the top of. If your Layers panel is missing, bring it back with the keyboard shortcut Ctrl + L (use Command + L if you’re using GIMP on a Mac). 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. With your image open in GIMP, locate the Layers panel in the bottom right corner of the interface. You don’t have to use the Eraser tool in order to get a transparent background in GIMP. Other Methods for Erasing to Transparency 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. 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. ![]() ![]() There are also a couple of other situations where GIMP might automatically add an alpha channel for you. 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! Step 2: Switch to the Eraser tool using the toolbox or by pressing the keyboard shortcut Shift+ E. The Channels panel now has four channels instead of the standard RGB ![]()
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