O Ilusionista said:I can't understand how a big image can consume less resources then just giving new offsets
Basically, OpenBOR trims the images itself on load, so there is no point in you doing it.
Offsets are applied to every image, it's likely not going to make a difference during game play. However, all those offset calls still have to be read in, which increases load-time (alibiet not really enough that anyone could notice) and make your text messy, so it pays to have as few as possible.
To paraphrase, eliminating offset calls is really just micro-optimizing from a performance point of view, but since it also makes your life easier there is no reason not to do it.
DC