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How do I change the color of a png image in GIMP?

If you mean one solid color over a transparent background then it is easy:
  • Set the alpha lock for the layer (checkerboard icon in the "Lock" line at the top of the layers list)




  • Bucket-fill the layer (without any selection) with the required color, the alpha lock will ensure the opacity of pixels isn't changed.

METHOD 2

You can adjust hue, saturation and lightness. The image must be in RGB color mode. If it happens to be an indexed color or a greyscale image, you must convert it to RGB (Image > Mode > RGB)
Indexed colors can be changed also by editing the color palette.
If you have a white background, it will not be affected if you define a color range.
It's in Color-menu.
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About Prof Krishan Kant Lavania

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