- Nov 13, 2014
- Reaction score
- Melbourne Australia
- Printer Model
- Epson R1800
According to the targen verbose output, there should be heaps of contrast between the patches and colored spacers (nearly 60 Delta E), so it's strange that you had problems. You could try increasing the space width slightly, using the printtarg -A option, i.e. "-A 1.5".I tried to read the black, white and grey patch chart with the ColorMunki Photo as usual. But it produced "too many patches" error almost every time and could only be coaxed into the occasional successful column read.
Another thing to try is to use just grey spacers (printtarg -b), although in theory they will have a worse contrast for the patch recognition.
By default the patch order is optimized to maximize the worst case contrast between patch and spacer color, to maximize reading reliability. Since at the end the paper is white, this will influence what patches are at the ends. The patch/spacer contrast should be fine though.Looking at the typical A4 colour patch chart it became immediately clear that ArgyllCMS never places light colour patches in the top and bottom rows (i.e. the start and stop points) on the A4 sheet.