display image with embedded CMYK profile

• Subject: display image with embedded CMYK profile
• From: "padmanaban gandhi" <email@hidden>
• Date: 31 Jan 2005 15:41:03 -0000
• Delivered-to: email@hidden
• Delivered-to: email@hidden

  Dear All,
            I have an imageViewing application, in which i can display images with
embedded RGB profiles. But in my application, it shows blank page when i try to open
an image with embedded CMYK Profile.


I am getting an NSBitmapImage representation of the image to be displayed.
I am adding the above NSBitmapImage representaion for one of the NSImage instance.

I have used this below code to get the NSBitmapImage representation for RGB color
space and it works fine.

  bitsPerSample      = 8;
         samplesPerPixel = 4;
        hasAlpha          = YES;
        isPlanar           = NO;
        destRowBytes      = portWidth * samplesPerPixel;
        imageRep           = [[NSBitmapImageRep alloc]     initWithBitmapDataPlanes:NULL
                                                                pixelsWide:portWidth
                                                                pixelsHigh:portHeight
                                                              bitsPerSample:bitsPerSample
                                                              samplesPerPixel:samplesPerPixel
                                                                hasAlpha:hasAlpha
                                                                isPlanar:NO                         
                                                              colorSpaceName:NSDeviceRGBColorSpace
                                                  bytesPerRow:destRowBytes
                                                              bitsPerPixel:0];


But for CMYK colorspace, i used the below code,

bitsPerSample      = 8;
         samplesPerPixel = 5;
        hasAlpha          = YES;
        isPlanar           = NO;
        destRowBytes      = portWidth * samplesPerPixel;
        imageRep           = [[NSBitmapImageRep alloc]     initWithBitmapDataPlanes:NULL
                                                                pixelsWide:portWidth
                                                                pixelsHigh:portHeight
                                                              bitsPerSample:bitsPerSample
                                                              samplesPerPixel:samplesPerPixel
                                                                hasAlpha:hasAlpha
                                                                isPlanar:NO                         
                                                              colorSpaceName:NSDeviceCMYKColorSpace
                                                  bytesPerRow:destRowBytes
                                                              bitsPerPixel:0];


And i  get only blank page.( and the error log shows that it is an invalid 
representation).


Can  any one please help me out, where i am wrong.

thanks in advance.
pathu.

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