Colour Space For printing we need sRGB or Adobe 1998 colour spaces. None of our equipment uses the CMYK colour space.   Our preference is sRGB as this has the closest gamut to photographic paper. Adobe RGB and ProPhoto have a colour gamut that is larger than photographic paper. Format JPEG or TIFF (TIFF files should be 8-bit, flattened and saved as IBM PC with no LZW compression)