On Friday 19 October 2007 07:47:10 Cory Papenfuss wrote: > On Fri, 19 Oct 2007, Greg Troxel wrote: > > How feasible would it be to use an IT8 target to calibrate a > > decent camera (i.e. manual exposure, RAW capture), and then turn around > > and use that to calibrate a computer monitor? I tried awhile back, but > > got bogged down trying to do the necessary table flipping. > > > > The big problem in the approach you describe isn't inverting the tables > > - that's certianly confusing but can be figured out. It's accounting > > for the lighting on the IT8 - you need a controlled light source to make > > a meaningful profile. When you did this, what light source did you use > > to illuminate the IT8, and what you were thining about how that related > > to the white point of the display? > > > > I have found that when I take pictures of displays they often come out > > badly. But I haven't tried with a tripod and a longish exposure, to get > > well past the refresh rate. > > > > But, I think that what you suggest is doable, and you may want to check > > out http://lprof.sourceforge.net/ as a starting point or a framework for > > your efforts. > > Oh yeah.... I think that was where I'd discussed it in the past. > Whoops. > > -Cory
There is an entry on the Scribus Wiki that details how to do this. But even though they got it to "work" the results were not so good for the darker tones. So this appears to be of limited utility. One other thing to consider. LProf and ArgyllCMS now support a wide range of measurement devices. So your assertion that measurement devices under linux are tough to come by and expensive is no longer true. Currently supported less expensive devices include the EyeOne Display series (original, 2, Lt and other variants) and the DTP-94. There will soon be support for the Spyder 2 and the Huey (although there are some issues with the HID interface on Linux that may cause Huey support to be delayed). In other words you can now use a number of available and inexpensive meters on *nix platforms and soon almost every available device available will be supported. In fact I have an OEM agreement with X-Rite for EyeOne devices and if there is interest I can get these and sell them at a discount. But I have to order these in larger quanities and I would need to have enough committed buyers to do a large enough order to do this. EyeOne Display Lt's are going for about $130 to $140 plus shipping on the net. I think I could sell EyeOne Display 2's for $110 plus shipping if there was enough interest. Hal ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
