Kai-Uwe Behrmann wrote: Hi, > A proofing transform is a combination of at least two transforms. The Not according to my definition it doesn't ! > first transform converts into the to be simulated colour space. The But that transform is something that shouldn't be simulated at all - it should be the actual rendering system. It's unlikely you know exactly what it's doing in order to be able to emulate it, so it's best not to try to. > second converts into the actual proofing device space. The image > processing happens in one go, hence the desire for one single device link. And then you only need one simulation/transform - from the device space being simulated into the device space of the printer being used for proofing. Of course if you really think you know what your rendering system is doing (say you are assuming that it is just "dumb" linking two ICC profiles), then you could create a simulation workflow using cctiff, either : input space -> simulated space -> simulated space -> printing device or you could use collink to pre link the two transforms, and then using cctiff to apply the two device links in succession. Graeme Gill.