Hi, With those measurement you could obtain a matrix-shaper profile. For some authours, these works on monitor even better that CLUT-based profiles. This is not unusual, but pretty normal indeed. The profiler is happy with these patches, just take the "MonitorTemplate.it8" file, in "pics" folder as a example. On more grays, better the profile.
lcms has a function to build "virtual" profiles based on these settings. cmsCreateRGBProfile(). You can save the resulting profile to disk by using _cmsSaveProfile() too. Regards, Marti. ----- Original Message ----- From: "James Burgess" <[EMAIL PROTECTED]> To: "Mart� Maria" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Monday, July 22, 2002 2:33 PM Subject: Re: [Lcms-user] Re: Thank You > 33^4 should be enough! > > I have a slightly unusual situation - I have a proprietry monitor > calibration scheme that I'm trying to emulate with ICC. The scheme I > have gives me the primaries of the monitor, the white point and very > precise brightness values for every step of r, g and b separately (3 > * 256). My first thought was to pretend to have an IT8 chart with 768 > patches on it which seems like it would work from your comments below. > > > > >Hi, > >Well, first you have to take in account that profiles does not contain > >sample points but a model for the colorspace translation. > >One particular implementation of this model, could be a 3D grid containing > >samples at fixed slices. If these are what you are referring, there is > >AFAIK no limit in ICC spec, but a cube side of 33 - 48 points is the > >practical limit. Note that, in RGB, a side of 33 points does represent > >33 * 33 * 33 * 3 = 107811 samples!! On CMYK, the numbers > >grow to enormous: 33 * 33* 33* 33 * 4 = 4743684!!!!! > >On 6-inks profiles, anything higher that 6 points is a little monster. > > > >Photoshop does work fine with this type of profiles, in fact, all > >profiles pre-revision 4 can be only of two different flavors: LUT-based > >(this ones) and matrix-shaper. Rev 4 will introduce a lot more variants. > > > >If you are referring to IT8 files, well, I've checked up to 1000 samples, > >I assume this would be enough for most applications ;-) > > > >Regards, > >Marti. > > ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
