If you need more colors than that, you'll have to convert the image to RGB mode anyway. However, note that indexed color mode (in GIMP, and also in the PNG format itself) only supports a maximum of 256 colormap entries. want to replace only some pixels of a particular color with the new color. The Colormap dialog also allows you to add new colors to the color palette, so that you can then draw using those new colors in the image (by first setting the color you want as the foreground color, and then clicking the button in the Colormap dialog).
#GIMP DRAWING NOT WORKING HOW TO#
Just open the dialog ( Windows → Dockable Dialogs → Colormap), double-click on the color you want to replace, and choose the new color you want in the color picker window that opens up. This tutorial shows how to fix the paintbrush tool in Gimp 2.10.20 when the tool won't draw or show any color or when you don't get the desired color. However, if you just want to replace a particular color with another one, everywhere it occurs in the image, then there's another option: you can edit the color palette itself by using the Colormap dialog. In general, as James suggests, you'll need to convert the image to RGB color mode in order to freely edit it. An indexed color image uses a specific limited color palette, and when editing such an image, GIMP will only use the colors available in the palette, mapping any other colors to the closest one in the palette. EDIT (and a correction): I have had to downgrade all the way to 2.10.0 in order for GIMP to work.
Currently a suggested 'solution' is to downgrade to Gimp 2.10.2 which is the most recent version where this issue does not occur. The following articles will help you determine if any of the above issues are causing your pressure.
#GIMP DRAWING NOT WORKING DRIVER#
Incorrect driver settings and pen defects can also cause you to lose pressure sensitivity. Why am I using this program It's that situation Paint and Pencil tool don't work, but I only care about the pencil since it's the only thing that can go down to a single pixel. A loss of pressure sensitivity could also be caused by interference from another device near the tablet, or by the use of a specific software or plugin. As James Henstridge notes, your PNG image is probably in indexed color mode. There seems to be strong evidence that the issue is caused by the interaction with Sophos antivirus. Pencil tool not working FIXED APPARENTLY all I had to do was click the Lock Pixels section of the layer, and then turn it off again.
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