Dear all, I'll don't like to disturb, but I've now the problem from another view angle : I test this situation now on PC. Converting just sRGB to Proof RGB. And get the same results. I send one of the profiles with this mai (I know, not a very common thing). This conversion with this profile results in a bright, high saturated image, if I use perceptual, rel/abs colormetric or saturated. This does not happen with ColorSync nor ICM2.0 nor AdobeCMS. What I saw is, that the dark of the profile is very small, looks like a tree. But this are the givin profiles by the manufactor. How comes, that lcms generates so wrong images with this conversion ?
I hope this someone could answer this, I donno what I should do, to get the BPC easely now. kind regards, Kristian Kratzenstein PS : This is the second mail, without the Profilefile, cause I don't know, if this will be sort out. It was a zip file with the Profile in. Profile was the : Pro4000 Archival Matte.icc givin by the Epson driver for the Epson Pro 4000 printer, available in the Epson package SPro4000.plugin in the (Apple) Library/Printers/Epson folder. "Kristian Kratzenstein" <[EMAIL PROTECTED]> on Montag, 7. November 2005 at 14:47 +0100 wrote: >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 > -------------------------------------------- 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
