The first layer in any JPG image you open in GIMP does not support transparency, because JPG’s themselves do not support transparency. That’s why GIMP’s eraser sometimes paints with black, white, or another color depending on the background color you set in the Toolbox. The color used to replace pixels is kind of arbitrary, so GIMP will use the “background color” to replace your image pixels as a default. Without transparency, the only way to “erase” using just R, G, and B channels is to replace the image pixels with a solid color. So you have a huge amount of colors to work with, but transparent pixels aren’t possible yet. A set of basic colors can be mixed together to make other colors. There are other color models like CMYK, but they work similarly. Combining channels in different ways basically gives you every color of the rainbow. Pixels can use combinations of these channels, basically mixing colors to make other colors like you did in elementary school. In RGB mode, those channels are red (R) green (G), and blue (B). Saving With Transparency Why GIMP’s Eraser is Painting Instead of ErasingĮach pixel in your image has color information stored in a color channel. Why GIMP’s Eraser is Painting Instead of Erasing If the eraser tool is painting instead of erasing, here’s what’s going on and how you can fix it.
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