i believe must be in .bmp format, before updating the grf, first make a safe copy then modify one of the copies so you won't have any errors
it must be .bmp format because that's the format that it reads
hehe to be honest, my sister know a lot of photoshop, i don't like her pretty often, but when i do she tells me some basic things lol i just used premade pic for it, not the big deal, thank you anyway hehe
there are a lot of videos in you tube to know how to use photoshop for a basic level like mine, you can try google too
eathena.ws is kinda abandoned (pretty inactive) and 3CeAM huh dunno about them
but since we are similar projects i don't see why you can't ask here
of course the only problem that may appear is that some modifications to the source and script can be kinda different, so let' just take care of them
rAthena can be renewall and pre-renewall (eathena like) so you can always choose lol no need to worry about it
every emulator and project has it's own errors/bugs, and that's ok so they can be fixed by the staff and that will make the emulator better
plus, there's always the forum, where you can ask anytime, even if you are not a merely a rAthena emulator user lol
allright i'll see them well i already saw them, see you there
since i already gave you what you asked for, i guess this topic can be closed, if you need more assistance only for the pictures there send me a pm and i'll answer as fast as i can
see you (:
don't hesitate to ask here lol