On Friday 14 December 2007 12:12:46 Cory Papenfuss wrote: > Thanks for the response. I gathered that the file format was a > bit different, but from the googling around (and the "user-supplied > measurement sheet in lprof"), it appeared that this sort of stuff was done > before. I thought maybe it was a spec2cie kinda function.
No these display meters to not produce spectral data only XYZ and/or lab data. spec2cie is for converting spectral data to XYZ and Lab format (IE. CIE formats). > > I did grab the CVS for lprof awhile back (and just now see a > 'spec2cielprof' function in it?). spec2cielprof is exactly the same as argyll's spec2cie utility. We gave it a different name so that if a user should happen to install both and then remove one of them the remaining applications would continue to work without the user having to install them to different prefixes. It is used internally to convert Logo (IE. GretagMacbeth) reference files, which only have spectral data, so that LProf can use them in it's camera/scanner profiler. LProf CVS now supports EyeOne Scanner 1.4, ColorChecker DC, GS and 24 patch targets as well as the HCT targets in addition to the IT8 targets it has supported since day one. Much of this work was part of the Google Summer of Code 2007 project. > It does see my instrument and appears > to work. I found the initial adjustments (black level, white level, etc) > for the seemed out of whack (contrast had to be brought way down, etc). I > guess in retrospect, much of this was my own ignorance at the time... > setting the maximum brightness down from 80 cd/m^2, turning off the > ambient lights in the room, etc. Since I first played with that and > temporarily gave up, I figured out how to do it from argyll. I was just > thinking that using a set of measurements from argyll with the nice gui > (and ability to store the raw data in the generated profile for viewing > the sampled gamut with iccexamin) might be convenient. > > > I guess one should probably stick with one or the other at this > point. The only reasons to have both is for testing or to do totally different things in each. For example the scanner or camera profiling functionality in LProf is comparable to ArgyllCMS but much easier to use. So I could see users who use ArgyllCMS for display calibration and profiling since it is currently more mature than the same functionality in LProf but who use the camera/scanner profiler in LProf because of the ease of use without a significant reduction in functionality. > I'm glad to see that lprof hasn't died... just gone into > publicly-apparent slumber in the CVS. Actually LProf is undergoing major enhancements at this point and has been since the last release. The new functionality is still somewhere between Alpha and Beta in maturity. When this gets a little more stable we will start releasing CVS snap shots. But we are currently seeing 600 to 700 downloads a month and with the code in it's current state a release would result in a huge number of support requests much of it because the new features have not been documented at this point. At the same time we would like to see more people testing and providing feedback. So it is a judgment call as to when is the correct time to start making CVS releases available. Also while we are on this subject; like all open source projects LProf is more than wiling to accept help from anyone who would like to contribute. There are a whole range of skills needed from programmers to graphic artists. If anyone would like to help please contact me. > > Cheers, > -Cory > > On Fri, 14 Dec 2007, Hal V. Engel wrote: > > On Thursday 13 December 2007 06:36:28 Cory Papenfuss wrote: > >> Hey all. I've recently purchased a DTP-92Q and gotten it to work > >> on my Centos5 box. I've successfully adjusted, calibrated, and profiled > >> my monitor using Argyll. I'd like to try to use the measurement sheet > >> created by Argyll (a .ti3 file) in lprof, but when I try to load it > >> lprof barfs on it. Is there a conversion that's necessary to an it8 > >> file to load it? > >> > >> Thanks, > >> -Cory > > > > Cory, > > > > Although both LProf and ArgyllCMS create and use CGATS files there are > > differences between the ArgyllCMS and LProf measurement sheets in terms > > of how the data is represented. Also the CGATS code in ArgyllCMS and > > LProf is different and ArgyllCMS does put some things in some of it's > > CGATS files that LProf does not handle very well. > > > > Actually LProf CVS should work fine with the DTP-92Q to generate it's own > > measurement and calibration sheets as well as creating profiles with a > > VCGT. I have tested it with a serial DTP-92 as well as a Huey, EyeOne > > Display 2/Lt and a Spyder 2. It should also work with the DTP-94, EyeOne > > Display, EyeOne Pro and SpectroLino meters as well. But as far as I > > know these are untested at this point. > > > > However the algorithms used to create the video card LUT calibration > > curves and to do the display profiles in LProf are currently on the > > simplistic side compared to ArgyllCMS. But these will still result in > > significant improvements to the display calibration for most users as > > well as useful display profiles. > > > > As a side note for those interested in getting a measurement device my > > current recommendation for those who want to do this but also want to > > minimize the cost is to get a Huey (around $50 plus shipping on ebay). > > This device works nicely with both LProf and ArgyllCMS and only has a few > > minor issues. The most significant of these is that it can give false > > readings of dark patches when there are high levels of ambient light. > > The solution is to calibrate and profile in a dim or dark room. The > > other issue is that the ambient light sensor does not correctly report > > the color temperature and always reports 5001K no matter what kind of > > light you are sampling. Of the meters I have tested I like the EyeOne > > 2/Lt the best but it is more expensive than the Huey. Since ColorVision > > has a very bad attitude toward the open source community you should stay > > away from their products. > > > > Hal > > LProf Project Lead > > > > ------------------------------------------------------------------------- > > SF.Net email is sponsored by: > > Check out the new SourceForge.net Marketplace. > > It's the best place to buy or sell services > > for just about anything Open Source. > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketpl > >ace _______________________________________________ > > Lcms-user mailing list > > Lcms-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/lcms-user ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
