oky, maybe this could help anyone to help me : I'm using RGB printer profiles for proof (in this case Epson). Now I did try other Monitorprofiles (like sRGB) and this works. So there seem to be a problem with the Printerprofiles. One is selfdone, the other one is givin by the manufactor. Both lighten the Image, but only with lcms, not with ColorSync. Could anyone say, where my mistake is ?
kind regards "Kristian Kratzenstein" <[EMAIL PROTECTED]> on Samstag, 5. November 2005 at 21:13 +0100 wrote: >Dear Steve, > >As I told before : >I do a conversion (internRGB -> Proof) >and (Proof -> internRGB) >Both RGB in this case >Switched BPC on and off (I understood this as a "perseptual" in only L >direction) >If I use one conversion, image brighter >If I both, Image much more bighter (black the same, so I do think this is >a gamma related problem) >If I convert intern -> proof -> intern in one step, image get darker. >Could anyone check, if maybe the Proof profile brings up the problem >(intern is Adobe RGB 1998) ? Or do anyone known, if CFM on MacOS X don't >work with in lcms (CFM and Mach-O are two different binaries (different >Pointer), Photoshop CS and before require CFM for Plug-ins). > >kind regards, > >Kristian Kratzenstein > >Steve Upton <[EMAIL PROTECTED]> on Freitag, 4. November 2005 at 23:17 >+0100 wrote: >>At 10:45 AM +0100 11/2/05, Kristian Kratzenstein wrote: >>>Dear Jan-Peter, >>>Dear others, >>> >>>maybe you help with this additional information: I tried to use lcms >>>transformation directly on the image (GWorld). I did so, and get the >same >>>bright image. Then I tried to use all three profiles in once >>>(intern->proof->intern) instead of two time changes (intern->proof, >>>proof->intern) and the image get much darker!!! than the orginal Image. >> >>I think the clue lies here: "need blackpointcompensation" >> >>Blackpoint compensation requires the knowledge of the source space's >>darkest black and the destination space's darkest black. If you split the >>transformation into two conversions then they both use Lab as the >>comparison point rather than the other profile... does this make sense? >> >>Regards, >> >>Steve Upton >> >>________________________________________________________________________ >>o Steve Upton CHROMiX www.chromix.com >>o (hueman) 866.CHROMiX >>________________________________________________________________________ >>-- >> >> >> >>------------------------------------------------------- >>SF.Net email is sponsored by: >>Tame your development challenges with Apache's Geronimo App Server. >>Download >>it for free - -and be entered to win a 42" plasma tv or your very own >>Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php >>_______________________________________________ >>Lcms-user mailing list >>Lcms-user@lists.sourceforge.net >>https://lists.sourceforge.net/lists/listinfo/lcms-user >> > > > >-------------------------------------------- >Kristian Kratzenstein >Gettorf > >[EMAIL PROTECTED] >-------------------------------------------- > > > > >------------------------------------------------------- >SF.Net email is sponsored by: >Tame your development challenges with Apache's Geronimo App Server. >Download >it for free - -and be entered to win a 42" plasma tv or your very own >Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php >_______________________________________________ >Lcms-user mailing list >Lcms-user@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/lcms-user > -------------------------------------------- Kristian Kratzenstein Gettorf [EMAIL PROTECTED] -------------------------------------------- ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
