Burckhart Seifert wrote:
After analyzing the result I have decided to profile the new measure file again with Argyll CMS 0.53 before delivering the profile. The reasons are: The preview of 0.60 looks very misshaped in ProfileEditor, in VRML it looks very different to the preview of the same file calculated with 0.53 and I have some results out of tolerance in some patches of the MediaWedge.
The resulting profiles from the data you provided don't look that different in VRML. They are a little different in behaviour, but not grossly so. Here's the results I get putting 10000 random device values through the two profiles A2B tables, between V53 and V60: Verify results: Total errors (CIEDE2000): peak = 5.193954, avg = 1.144390 Worst 10% errors (CIEDE2000): peak = 5.193954, avg = 2.585372 Best 90% errors (CIEDE2000): peak = 2.057085, avg = 0.984281 The v53 result is a bit suspect in any case, because the smoothing level was grossly low, and the profile fitting was stopping prematurely. It did mean that it better accommodated strange behaviour from a device, at the cost of poorer smoothness. Given that, the results with V60 do have quite a large self fit error (peak 10.5, average 1.93 delta E). Most of the profile fit errors seem to be near cyan == 100%. Something funny seems to be going on in that channel at least, as it approaches 100%. Is there a calibration system on the RIP ? How are the calibration curves targeted ? The chart is very regularly arranged, which is often not very efficient (that's why Argyll generate charts are different). Although it's a bit of a pain with a strip instrument, more patches may help accuracy, particularly if proofing is the aim. I generally like about 3000 for a CMYK device. Graeme Gill.