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NiuHaka said:
Well, you can achieve this by using a source port. I'm not sure about any of the others but Doomsday Engine allows you to do this quite easily. That port is not very popular in the Doomworld community but it is the most downloaded source port out there.

If you use doomsday engine you can just create a pk3 or zip containing your HD image replacements and then add that to the appropriate folder. Simplified of course but not by much.

I suggest you look around at the available source ports and do a little bit of reading. Once you get an idea of which source port you want to use you can ask this question again either here or in a dedicated forum. If you don't want to use a source port then I suspect your life is going to be much more difficult.

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Gez said:
With ZDoom, the best way to go is to indicate the scale in TEXTURES or to have a placeholder of the proper dimension with the same name in the normal sprite namespace, and your high-res version in the hires namespace.

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