I was wondering, when you mark seams or do a project from view to mark and island. do you keep it as it is? or do you scale the uv isalnd up to use the complete image by using snap to pixels and constraint to image bounds along with average island scale?
or should I create a new uv and enter image height and size? this of course if its a seamless texture of wood or cement, metal etc.
All depends on your shot -> close shot means more details so big image , memory usage -> how many gig your computer is take, is for movie or game. The uv is just a way Blender will map your model you are basically telling blender to use a part of your image and map it into your model with a given color so scaling your uv map is depends on the stuff i mentioned above.
Hope i was clear enough if not please ask.