Converting a color stamp (picture) to grayscale heightmap?

These are tga stamps (see below). How do I convert these to grayscale heightmap (for use in another program)?

You can export them as tga, then convert in app like photoshop or GIMP.

I think unreal cannot export color texture as greyscale, it cannot convert that data on export, it can only export to some other compatible format. Like color TGA to color PNG.

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