: How can I change the color of images in GIMP? I'm creating a login form like the following. Now I have the color versions of the images but I don't know how to make them black and white.

@Tiffany317

To make a colored bitmap black and white in Gimp follow these steps:


Adjust Colors > Hue-Saturation to Saturation -100


Make grey tones black using the Colors > Levels tool by dragging the black point to the right until happy (here I used 150 for black):


Make the white background transparent with Layer > Transparency > Color to Alpha choosing (default) white as alpha color:




Only in case there was no antialiasing from the originals we may also transfrom a colored image to black and white whithout any grey tones using the Colors > Threshold tool but this usually will lead to considerable aliasing artifacts.

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