Does a tool exist for generating map data (metatile definitions, map data, CHR data) from a "big" image file?
I have been previously using Mappy for that but my current method (LUA scripts) requires indexed images with the color indices matching the NES background palette indices. I'd rather supply a separate palette image as organizing the palette is sometimes hard. For example, in some cases there's no way to (EDIT: automatically) properly convert RGB images to paletted in Photoshop so that the color indices match the NES palette indices.
I have been previously using Mappy for that but my current method (LUA scripts) requires indexed images with the color indices matching the NES background palette indices. I'd rather supply a separate palette image as organizing the palette is sometimes hard. For example, in some cases there's no way to (EDIT: automatically) properly convert RGB images to paletted in Photoshop so that the color indices match the NES palette indices.