More patches... My most notable Argyll epiphany was figuring out how to use Argyll's multi-sheet targets for profiling my camera by simply concatenating the data blocks from multiple scanin ti3 files into a combined ti3 file before running colprof. This let me use my widest gamut paper and Epson HDR inks to generate a perceptually uniform 3000 patch target set for profiling not just the printer, but also my camera! And I can use that same concatenation technique to combine my custom target camera data with data from shooting my ColorChecker DC target, custom PTFE white patch, specific art colors, etc. The results have been outstanding. - Brad From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Kamil Tresnak Sent: Wednesday, October 08, 2014 5:03 AM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Very poor results with 1000+ patch target. Hello Michael, congrats! So problem was in measuring procedure? As a next step, if you wish experimenting a make some progress, i would recommend chart with little bit more patches, you probably do not need thousands of patches, but somewhere around 1500 can give you more satisfied results (see Argyll doc, you can experiment with power parameter and cover colors which are important for you). Regards, Kamil On Wed, Oct 8, 2014 at 6:18 AM, Michael Gallagher <gallaghermikey@xxxxxxxxx> wrote: Success! I made a 524 patch sheet, and using the ruler and slit I was able to get this on running colprof: Peak err = 1.633284, avg err = 0.377664, RMS = 0.441556 Here's the IT3 for anyone interested: https://www.dropbox.com/s/yjdn3a8lxyls2h8/Arches_524_i1.ti3?dl=0 I'm assuming this is pretty good, right? Either way, the resulting test print was, by far, the best that we've seen. My wife and I are very happy with it. Thank you all for the help. The next step will be to figure out the scanner's accuracy, since that does seem to be off slightly. Kamil and Alan: It turns out the ColorSync app DOES correctly print out targets (of course, when "Print as color target" is selected). To test this I cropped a strip of patches from a target, and printed two of them side by side. One with ColorSync and the other with Adobe CPU. When comparing the two rows, there is no difference between them at all. Matthew: we're in northern Utah. The processes you mentioned sound very interesting, and I would love to see that PDF. My understanding of color matching is quite limited (my wife is the artist, but I'm a CS student and I'm comfortable on a command line so figuring out ArgyllCMS became my thing), but I am interested in seeing how others do manage to do stuff like this. Do you coat your papers, or use inkjet watercolor paper, or anything of the sort? One thing I'm noticing is that the thin lines don't seem to be quite as sharp when printed. It's not that bad though. I'm assuming this is just because I'm printing on a paper not meant for printing. Graeme: Thank you very much for your suggestions. A couple questions: is there much to be gained from optimizing the profile I have? e.g. running targen -c with my new ICC profile. Also, after running colprof -v, the ICC file shrinks in size. It went from 1.2 MB to 279 KB. Is that profile still usable? Thanks again, Mike On Mon, Oct 6, 2014 at 1:11 AM, Kamil Tresnak <kamil.tresnak@xxxxxxxxx> wrote: Hello Michael, maybe, the problem is in the printed charts, maybe there is a difference between printed chart and ColorSync PDF export. Your printed chart - seems like OK? Maybe you can find some colors which are exactly same (CMYK source valueas) on both charts (maybe full c/m/y) and make spot color measuring to ensure that you dont have problem with printing output. Regards, Kamil Tresnak On Sun, Oct 5, 2014 at 4:01 AM, Michael Gallagher <gallaghermikey@xxxxxxxxx> wrote: > Hmm... here's something I just noticed. In ColorSync, when I select "Print > as color target", the colors in the little preview window end up changing > drastically. Is this normal? I saved the preview as a PDF on the bottom of > the Print window to show you guys. Here they are: > > Original Argyll generated TIF target: > https://www.dropbox.com/s/kfp78d7oytepynh/1050_Arches%20Original.tif?dl=0 > > ColorSync Target saved as PDF: > https://www.dropbox.com/s/b6pvvsgniw9misz/Arches%20ColorSync%20Target.pdf?dl=0 > > I'm going to try using Adobe's Color Print Utility to see if the same thing > happens during the print. > > On Sat, Oct 4, 2014 at 7:39 PM, Ben Goren <ben@xxxxxxxxxxxxxxxx> wrote: >> >> On Oct 4, 2014, at 6:23 PM, Michael Gallagher <gallaghermikey@xxxxxxxxx> >> wrote: >> >> > Forgot to ask again: After I make this new target, is there any way to >> > generate targets/patches from a JPEG to optimize the profile? >> >> That sort of thing is much more useful for input (camera or scanner) >> profiles. In your case, what you'll want to do is use the "basic" profile >> you're about to create to "pre-condition" the patch generation algorithm in >> targen; see the "-c" option. >> >> b& > >