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Here is the image I want to make into a normal map:

Texture containing lighting data for LEGO-like studs

I've tried multiple tools for converting this image into a normal map, but they all seem to interpret the image wrong. The normal map is always rendered with weird ridges rather than studs with proper lighting. How do I turn this image into a normal map with the same lighting as seen in the greyscale version? (I have access to Photoshop if that helps, but I'm willing to use online tools as well.)

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  • what does "normal map" mean? Without the pseudo lighting, it would be just a solid grey rectangle.
    – Scott
    Nov 20 at 3:36
  • Normal map, instead of bump map, for 3D rendering.
    – Rafael
    Nov 20 at 3:52
  • But this is not a bump map either. It is a shaded image.
    – Rafael
    Nov 20 at 3:52
  • @Rafael yes, but how do I turn the shading into normal information for the 3D renderer?
    – AcinonX
    Nov 20 at 4:07
  • Actually, I think I figured it out: I should make 4 different versions of this image with different lighting and feed them into the normal map generator.
    – AcinonX
    Nov 20 at 4:08

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