Hello. At frist I want to say thanks for lcms. I planned to add color correction to xsane since a long time but never started it until some weeks ago I took a look at lcms again and thought that now is the right time to try it.
Adding preview and viewer support for RGB images to xsane was much more easy than I expected. The most work was to think about the changes in the user interface of xsane. Doing the color correction while saving the image (instead of embedding a profile) also does work for RGB images. (I still have problems with grayscale images but this has to wait in the moment). Now I am trying to find out how to create color corrected RGB postscript files. I looked through the lcms mailing list and found some information in the message http://sourceforge.net/mailarchive/message.php?msg_id=5763412 In the moment I try to create color corrected postscript files by hand at first: 1) I create a CSA with icc2ps -i scanner.ICM > scanner.CSA 2) I create the CRD with icc2ps -o printer.ICM > printer.CRD 3) I have a scanned image that is saved as (non color corrected) RGB postscript: image.ps now I try to create a color corrected postscript by concatening: file "printer.CRD" line "<< /UseCIEColor true >> setpagedevice" file "scanner.CSA" file "image.ps" line "/DefaultRGB exch /ColorSpace defineresource setcolorspace" (this is IMAGE A) but the message above explains it a bit different (but may be there has changed something in lcms since then): file "printer.CRD" remove "/Current exch /ColorRendering defineresource pop" (or create CRD with icc2ps -u) add "setcolorrendering" line "<< /UseCIEColor true >> setpagedevice" file "scanner.CSA" file "image.ps" line "/DefaultRGB exch /ColorSpace defineresource setcolorspace" (this is IMAGE B) I do not have a color printer to test the result, so I tried to display the results on my screen: - display (imagemagick) does not show any color corrections at all - kghostview shows the original (untouched) image but does not produce any output for the files with CSA+CRD included - gimp and "gs -sDEVICE=x11" show changes in the colors with CSA+CRD included, but the images A and B look different and I can not decide on the screen which one is the correct one. Question 1: What is the correct way to create a postscript file with CSA+CRD? Question 2: How Do I produce a device independent postscipt file with an included CSA but without a CRD? Is it done this way:? line "<< /UseCIEColor true >> setpagedevice" file "scanner.CSA" file "image.ps" line "/DefaultRGB exch /ColorSpace defineresource setcolorspace" The postscript headers have to be moved to the top of the file I think. Question 3: (a bit OT, but may be you know): When I want xsane to transfer the postscript directly to the printer should I always prepend the CRD to the postscript file or does a real postscript printer know his CRD and the CRD should only be prepended for ghostscript? (or should the ghostscript/printer deamon prepend the CRD?) Question 4: Is it good to store the image in RGB or should I convert it to CMYK before saving it as postscript? Question 5: When I want to put images that are scanned with different scanners into one postscript file how do I apply different CSA to the different images? This way?: "<< /UseCIEColor true >> setpagedevice" CSA1 line "/DefaultRGB exch /ColorSpace defineresource setcolorspace" image1 CSA2 line "/DefaultRGB exch /ColorSpace defineresource setcolorspace" image2 Thanks for your help. Best regards Oliver ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
