Editing pictures results in Unsupported Color type?

[Greatpriceman]

Every time I edit a picture/sprite or resize it and then do the Make command, I get this:
"$ make
"graphics/title_screen/rubyversion.png" has an unsupported color type.
make: *** [graphics/title_screen/rubyversion.8bpp] Error 1"

Does anyone know why this is? and what fixes can be taken so that this error doesn't appear again?

[RevoSucks]

Use a proper image editing tool such as Graphics Gale. Color depth must be 4 or 8 in order to compress to the correct file.

[Greatpriceman]

I'll try that, now Do I edit the PNG files or the .bpp files?
it'll also show the error if the png has been edited, but not had the dimensions changed.
EDIT: ok, so I tried Graphics Gale, and it looks like when Edited in Microsoft Paint, the Edited files take on a 24Bpp instead of 8bpp color depth. Is there anyway for the code to downconvert the edited pngs to *bpp? ( being 1,2,4 or 8)

I guess I'll use Graphics Gale for the Time being, thanks for some of the help. :)

EDIT, New Problem: I've tried editing the Title Logo, and When I fill it all black, it messes up the title screen, and when I replace it with with a different piece of art, it breaks. it seems the only way to fix it is to leave the title logo and graphics as is. and Yes, I did try Graphics Gale for this.

[ghost]

The problem is that the title screen logo is compressed so when you change it, the size changes. This causes subsequent data to have different addresses, which is a problem since the disassembly is not 100% done. You will need to find free space, put the new graphic there, and then repoint the logo for the time being, unfortunately.

[ghost]

You should be able to modify compressed graphics without the game breaking now.