Alastair M. Robinson wrote:
Try with -k0 and see if that fixes your problem - it should result in RGB000 mapping to device black - normally at the expense of grey-ramp neutrality - but it sounds as though the normal behaviour down there is interacting badly with your particular hardware.
Actually it does that automatically for -yl :-) I've been taking closer look at it, and have decided that there are some problems with the current way dispcal is computing the target curve values. I think I might shortly put together a new snapshot to address this issue, since I've got much better looking results after re-working it somewhat. Graeme Gill.