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I'm creating a login form like the following. enter image description here

Now I have the color versions of the images but I don't know how to make them black and white. Can you help me?

enter image description here

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

  1. Adjust Colors > Hue-Saturation to Saturation -100

    enter image description here

  2. 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):

    enter image description here

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

    enter image description here

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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