Hi :) Jon Zeeff wrote: > targen + dispcal didn't work (probably operator error) for this: > > $targen -v9 -d3 -D7 -D8 x Try this: targen -d3 -f0 -s256 x You'll get a 256 step testchart for each of the three channels - if you *really* don't want G and B you can remove them in a text editor. All the best -- Alastair M. Robinson