[2k3] Invalid color depth isn't nice

I have the NES palette. When I try to import it, invalid color depth is reported. I could just save the palette as a 256-color BMP and completely ruin it. Easy.

However, I didn't like the damage done to it and decided to remake it as best I can using vanilla sprites for color reference. That means that I am using a palette made completely from things that were made for 2k3. When I try to upload the updated palette, it still reports to having invalid color depth.

Is there a way to actually get around this? The same way that the vanilla sprites got in?

Get gimp or photoshop or download graphics gale or idraw or something.  copy the picture into there and save it as a 256 color png or something.  Usually the issue with images, even if it has 256 colors or less, it still tries to register the full spectrum allowed by the file (the specifics I am unsure about) so you need to make sure the file really is a 256 color file.  Usually it's just ms paint that screws the colors up.  Photoshop, gimp and whatnot will just dither the image if it needs to. 

Hope that helps.

Can I do such a thing on Paint.net?

Can I do such a thing on Paint.net?

Maybe but I'm not positive as I've never used it.  Most people suggest gimp as the free alternative to photoshop though so it might be a safer bet to use that or graphicsgale free edition.