Thanks Marti. I'm just playing with the free GretagMacbeth Measure Tool - it's *almost* working with my Eye One Display puck, but it's returning colour values which are wrong. :( (e.g, strong cyan cast for a white which is close to D65) Maybe it only works with some older versions of the puck? (I see that it lists an Eye One Display (CRT) and an Eye One Display (LCD) in the list of devices - there is no entry for just "Eye One Display")
Now, regarding the Eye One Match profiles, I certainly need absolute intent, and I imagine most folks doing printing would too. The reason is simple: a soft proof does an *absolute* intent conversion from the printer profile, to the monitor profile. (after first converting the image to the printer space, using whatever intent the user selects). Thus, if I'm to do soft proofing, it appears that I will need to calibrate my display to D50. Perhaps most folks who do soft proofing already calibrate their displays to D50, but we shouldn't be *forced* to. In my opinion, Eye One/GretagMacbeth should warn the user about this problem, if what you are saying is true. Greg. ----- Original Message ----- From: "Marti Maria" <[EMAIL PROTECTED]> To: "Greg" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Wednesday, January 21, 2004 8:30 PM Subject: Re: [Lcms-user] Using Eye One Display for colour measurements? > Hi, > > Ok, here are some notes about EyeOne and the monitor profiler. > > Right now, beta 3 does ONLY support EyeOne display. > > I have also a patch for the "normal" EyeOne, which is a spectrophotometer > and a lot more expensive. Images of both devices in the profiler page > here: http://www.littlecms.com/profiler_qs.htm. So, if anybody is interested > on using this device (EyeOne) please contact me or wait until beta 4. > > The monitor profiler does work reasonably well on CRT. For TFT is not > working, still needs a few debugging. I will try to add support for TFT in > my (rare) spare time. > > For CRT and EyeOne display, is working quite well. I made a profile for a > LaCie electron22blueIV and then checked about 400 additional patches. > Mean dE is still about 1, and the maximum does not exceed 6, which > seem reasonable. Again, if anybody is interested on doing similar testing > please contact me. > > There are, however, differences in the profiles created by lcms profiler and > those created by EyeOne software. Perhaps the most important is the white > point. Yes, I also noticed Gretag software is using D50 always. This is not > important unless you plan to use absolute colorimetric intent. In such case > the profile does need the white point to recover absolute values. > > Another difference is the use by Gretag profile of a special tag called > 'vcgt' (which stands for 'video card gamma tag' ) Profiles using > that does need a loader, and modifies the hardware gamma ramps. > I am trying to avoid this entirely on all lcms library and tools, since > that affects ALL applications, and not only those explicitly color-managed. > > Please note this is NOT in any way a criticism to Gretag profiles, they > does work and are accurate. I'm just offering an alternative from a different > point of view. > > Finally, the lcms profiler does NOT set the profile as default nor touch > anything of your windows configuration. It only saves a profile in the > color folder and then uses this profile for its own business. If you want > to use the profile in any other application (Photoshop, for example) you > must associate the profile to your display manually. This is done by right-clicking > the desktop and selecting "Properties-settings-advanced-Color management". > To know the name of the profile, in the profiler, select Imaging options-Monitor > advanced. Sounds a bit complex, sorry, beta 4 will make things a bit easier. > > > Regards, > Marti Maria > The little cms project > http://www.littlecms.com > [EMAIL PROTECTED] > > > > > ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
