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
