You should be able to "type in " any res you want opening that. So even if it says open in 10800x10800, you can simply type in "21600x10800". Ofcourse you must resize it to the original "10800x10800" when saving.
To get the color you should follow the steps as described in the link I posted previously.
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You can open it with PS, you have to select open as and choose photoshop raw, in the dialog change width and height to match the file you're opening (4320x2160 or 21600x10800), change channels count to 1, depth must be 8 bits.
The image is a grayscale one, to see it in colour you need to change the format to indexed (menu->Image->mode->indexed color), then goto menu->Image->mode->color table, hit load and select terrain.act from the terrain/pal folder, in order to give it more contrast you need to work with the palette, not the image as it could have undesirable results, once you're done save the palette overwriting the original one.
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Now i found that you cant save it correctly once you have gone from "Multichanel" - "Grayscale" - "Indexed Color", it will save it in LIGHTER! colors. So this you can only use to test.
You have to sort of figure what kind of "GRAY" does what you want in the "Multichanel" and save it directly from there, but this "GRAY" can be tested and checked using the "Index Color" mode (but only for testing purposes as I said)
But the more I think about this the more unlikely it is that this actually changes the real 3D world, it will show up on the map SURE! but...give it a go and tell us...
Ahhhh also...this will be a hell of a heavy mod if you get it going as you need BOTH! Map files for this...