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I am using photoshop and I would like to know if there is a way to control the number of shades in a gray in the image? I want to create an image that has 32 shades of gray (i.e. 0, 7, 15, ..., 255).

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  1. Open a grayscale image or convert existing image to grayscale (Ctrl + Shift + U)
  2. File > Save As...
  3. Choose to save the image as a gif
  4. When the Indexed Colors window pops up (see image below)
    • set the palette to 'Uniform'
    • set the number of colors to a power of 2 (32, 64, etc...)
  5. If you want edit the image, close it, then re-open it. Photoshop will only let you use valid colors while editing.

Indexed Color Dialog

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