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colorspace for grayscale images

hi,
I have a grayscale image in memory as pixel data...
every pixel is stored on 8 bits.
I created an NSBitmapImageRep to display the image...and inited it with :

initWithBitmapDataPlanes:pixelsWide:pixelsHigh:bitsPerSample:samplesPerP ixel:hasAlpha:isPlanar:colorSpaceName:bytesPerRow:bitsPerPixel:

my problem is : what colorspace should I use ?
I tried all of them but none seem to be able to display my image...

do I have to create a new one and if so, hw do I do this ?

Thanks for any answer

Damien
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