|Wednesday, March 26, 2014||(Comment)|
How to invert colors in a selected region with GIMP
Twice in recent days, I needed to invert the colors in a rectangular region of a graphic (changing the region from white-on-black to black-on-white). The difficulty was that GIMP's color-inversion commands seem to work on the whole canvas even if a region is selected. Here's how I got around it.
First select your region. Then click the menus as follows:
Edit → Cut
File → New → OK.
In the new window, click:
Edit → Paste
Colors → Invert
Select → All
Edit → Cut or Copy.
Re-activate the first window. Then click
Edit → Paste.
That pastes the new color-inverted image right back in the hole that was cut out of the old image. It also creates an extra layer, which you might want to eliminate by (e.g.)
Image → Flatten Image.
This worked for me. If you have a better solution, you're welcome to comment.
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