05-19-2011, 08:03 PM
Sheets are preferred. I don't even think that the site accepts ZIPs.
When making the sheet, be sure to keep the transparency there if you have some partially transparent pixels; otherwise, you'll lose quality in the convert. If it's just a single colour, though, you can just add a shade of white or some other colour that isn't used anywhere else on the sheet.
When making the sheet, be sure to keep the transparency there if you have some partially transparent pixels; otherwise, you'll lose quality in the convert. If it's just a single colour, though, you can just add a shade of white or some other colour that isn't used anywhere else on the sheet.