On Feb 11, 2008 1:22 PM, Roger Breton <graxx@xxxxxxxxxxxx> wrote: > Hello Lars, > > I'd be interested in looking at your adaptation of TC9.18. But before I do, > I'd like to understand why it is presumably superior to a an > Argyll-generated ti1 RGB target using a similar number of patches. > > Perhaps we could start by a VRML of TC9.18? If such thing is available. And > then a VRML of some Argyll chart? That way, we would have some "logical" way > to compare both targets. > > I always believed that the spacing of the patches within an Argyll target > was superior and therefore, could result in superior profiling. But if you > think that the Atkinson target knows something that Argyll does not know > about characterizing a printer RGB space then I say we all try to learn from > it. > > Best regards, > > Roger Breton Sorry for not clearing that up that. I'm sure Gill's targen command is quite superior. But I don't think the rest of the world knows this. Let say someone in the local photo club asks me, if I can profile their printer. And I ask them, should I use a world class self made printer target or one that rest of the world use. I guess most of them will prefer the "rest of the world" version, especially when they know my world class operating system. :-) I would continue to use targen myself and recommend it to others. My starting point was more it nice to have the possibility to read those "standard" targets. It is also a part of my learning process. The creation of the target was quite simple. I downloaded the colorlab utility. It runs on my linux box with wine. I read in the reference file and created a custom layout for it. ****** And back to the target, something is terrible wrong. :-) I have created a reference file for the freely available profilemaker measurements tool. I have installed this on one of the computers at my work. It only works in left right direction with my ref file, but I get a deltaE about 0.05 better than argyll. I guess this confirm that my file is not so bad created, but maybe I can tweak the ti2 file a little more. I have added the files to the above address. profile –v read_by_chartread (sample-luster.ti3) profile check complete, peak err = 4.363661, avg err = 0.938499 profile –v read_by_profilmaker (sample-profilemaker.txt ) profile check complete, peak err = 3.614479, avg err = 0.882414 Regards Lars Tore Gustavsen