SCUMWIZARD'S PROFILE

This may be more of a problem with GIMP because that's what I'm using to make and covert the image to 256 colours, but I really don't know. The more I look into this, the more I realise I really don't know how to use GIMP. But I'm fairly new to this so there might be some obvious thing I'm missing.

Basically, RPG maker 2003 won't let me import a character sprite (the one for moving around outside of combat). I convert the image to 256 colors and try to import it and it gives me the standard "Unsupported PNG Image! Make sure you are using a color depth of 8 bit (256 colors)." I'm sure I did the same thing with a photo to use as a title screen and that worked fine.

Update: fixed the problem by converting the image to 256 colors while it was next to a bunch of the standard RPG maker sprites. I assume it has something to do with RPG maker only accepting specific kinds of colors but I'd still like someone to explain it to me.