Dear Jan-Peter, I don't use any of this linked profile irectly to show on screen. This is done with Quartz, and this get the device profile of the output device for drawing. The calculation are done in memory. Before I did use Colorsync for (Input -> Printer) and (Printer -> Input) for proofing, that works well. Now I try to use LCMS for creating device linked profiles out of both calculations. The drawing on screen is not touched, the screen profile / rendering not changed. When I use both calculations at once (needed for proofing), the Image get real bright. when using only one (lucky, the printer profile is also rgb) the Image got also brighter, but not that hard. It looks like there is a gamma in every linked profile, which is added in each step. In addition : when I use absolute colormetric, the Image become also bright.
kind regards, Kristian Kratzenstein [EMAIL PROTECTED] on Sonntag, 30. Oktober 2005 at 21:52 +0100 wrote: >Hello Kristian >Please make a test by using the devicelink-profile with the applescript >from >http://www.colorremedies.com/realworldcolor/downloads.html > >Than compare the result with the same source-image and standard >source-destination ICC-transformation in a program like e.g. photoshop, >where you can use a pipette for measuring the color-values. > >After a devicelink-transformation, colorsync has no info, which profile >should be used to show on screen. So it taggs the image normaly with the >standard profiles "Generic-RGB or generic-CMYK to show it on the screen. > >May be this is the problem. > >:-) Jan-Peter > >Kristian Kratzenstein wrote: >> Dear all, >> >> I've a problem with the device link profiles created by lcms, when using >> under ColorSync. It looks like by using the device linked profile (8 or >16 >> Bit) adds a gamma on the Bitmap (8Bit). I use the way discribed in the >> "icclink.c" file, just saving the profile to mem. >> >> I open the Profile with CMOpenProfile and use CWConcatColorWorld to >create >> the ColorWorld (Transformation). When this ColorWorld is used on the >> Bitmap, the Image is brighten. Cause I do this two time on the Image >(kind >> of Softproof), the Image looks very bright. >> If I use a ColorWorld (two in this case) fully gernerated out of the >> source Profiles, no additional gamma is calculated on the Images, so it >> looks like the devicelink Profile has something like it in itself. >> >> Is there a way to limit this gamma to 1.0 (so no gamma is done) ? >> >> Thanks, >> >> Kristian Kratzenstein >> Gettorf >> >> [EMAIL PROTECTED] >> -------------------------------------------- >> >> >> >> >> ------------------------------------------------------- >> This SF.Net email is sponsored by the JBoss Inc. >> Get Certified Today * Register for a JBoss Training Course >> Free Certification Exam for All Training Attendees Through End of 2005 >> Visit http://www.jboss.com/services/certification for more information >> _______________________________________________ >> Lcms-user mailing list >> Lcms-user@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/lcms-user >> > > >-- >-- > >homann colormanagement ------ fon/fax +49 30 611 075 18 >Jan-Peter Homann ------------- mobile +49 171 54 70 358 >Kastanienallee 71 ------- http://www.colormanagement.de >10435 Berlin --------- mailto:[EMAIL PROTECTED] > -------------------------------------------- Kristian Kratzenstein Gettorf [EMAIL PROTECTED] -------------------------------------------- ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today * Register for a JBoss Training Course Free Certification Exam for All Training Attendees Through End of 2005 Visit http://www.jboss.com/services/certification for more information _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
