by LordHavoc » Tue Sep 06, 2011 3:57 am
Actually the size must be a multiple of 16, this is due to how software quake does lightmaps and mipmaps.
So 16x16 is the smallest acceptable texture, and other valid dimensions include 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 and so on... There is no need for a texture to be square, but both dimensions must individually be a multiple of 16.
Also you generally want to avoid use of the fullbright colors unless you mean them to be fullbright, so be careful when remapping textures to the quake palette, some tools will avoid use of fullbright colors and some will not (which may look okay in glquake but won't look right in software quake or darkplaces or fitzquake, etc).