ImageMagick CMYK to RGB

1. Nicolas BUI October 28, 2007

   Hi Jonh,

   Thanx for this cool post… I’ve encounter the same problems .. and thanx to you this succesfully solve the problem !
2. JK November 22, 2007

   Thanks man, your post fulfilled its mission!
3. Todd Dellagio March 10, 2008

   Thanks a lot man. That really helped me a lot .
4. anthony Thyssen March 15, 2008

   You don’t have to mody an existing delegate in the system delegates file. You can create your own delegate.xml file in a “.magick” sub-directory of your home. You will need to name the delegate something new however.

   If you do this you can create say a “pscmyk:” delegate to handle CMYK postscript files while leaving the normal postscript handling of IM alone.

   This also means you don’t need ‘root’ previlages to make the change needed.

   See IM Examples, Delegates
   http://www.cit.gu.edu.au/~anthony/files/#delegates
   (section still under construction) for more details.
   If you do develop a “delegate” please contribute.
5. Anil Sharma April 16, 2008

   Thanks John. It was very useful.
6. Chris May 23, 2008

   Need a bit more help here… I have already installed ImageMagick on a windows machine. I can find the delegates.xml file but don’t see any block of code similar to above. I have not yet installed GS. Can I just run the GS exe and will modify the IM delegates file to include the GS stuff? I don’t want to mess anything up in the IM setup at this point.

   Thanks.
7. Tyler Thorsted June 6, 2008

   This is exactly the information I need to get the color under control during conversion. The only question I have is if the patch is still needed with the latest version. If it is how do I go about getting GS patched? I get terrible color conversion from CMYK PDF to RGB image. Even with profiles it has no effect.

   Thanks!
8. kanwar September 1, 2008

   Hi guys,
   i have a problem very related to the one discussed above:–
   when i convert eps file to jpg from ghostscript using
   “gswin32.exe -sDEVICE=jpeg -dJPEGQ=100 -dNOPAUSE -dBATCH -dSAFER -r300 -sOutputFile=myfile.jpg myfile.eps”
   the output file “myfile.jpg” is in a proper jpg format, but when i convert it using Jmagick (ImageMagick 6) , the file created is not readable by java , whenever i try to read it using this code

   MagickImage image = new MagickImage(new ImageInfo(”C:\\idp_IMAGES\\52DGB 010.ai”));
   //MagickImage image = new MagickImage(new ImageInfo(”C:\\logo.jpg”));
   MagickImage[] pages = image.breakFrames();
   System.out.println(pages.length);
   System.out.println(image.getImageFormat() + ” - ” +image.getImageType());
   ImageInfo info1 = new ImageInfo(”c:\\idp_IMAGES\\dummy.ai”);

   image = image.scaleImage(1000, 1000);
   image.setXResolution(330);
   image.setYResolution(330);

   image.setFileName(”c:\\idp_IMAGES\\harleen.jpg”);
   image.writeImage(info1);

   try{
   BufferedImage bufImage = ImageIO.read(new File(”c:\\idp_IMAGES\\harleen.jpg”));
   }catch (Exception e) {
   e.printStackTrace();
   }
   }

   i am getting
   javax.imageio.IIOException: Unsupported Image Type
   at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(Unknown Source)
   at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(Unknown Source)
   at javax.imageio.ImageIO.read(Unknown So

   But the thing is when i manually convert the file using ghostscript, the same code works like a proche

   Please help.
9. kanwar September 1, 2008

   Noticed one thing , if i do this to
   image.transformRgbImage(ColorspaceType.CMYKColorspace);

   then ImageIO.read(..) is able to read, but the colors are awefull
   i desperately need my original colors and still need ImageIO.read(..) to pick it
10. Mike Duguid September 22, 2008

    @ Tyler - it would seem the latest ghostscript file gs_init.ps is patched (around line 1892), the patch additional lines are there. Still haven’t been able to get a sensible conversion though..

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