if (REALLockPictureDescription(pic, &desc, pictureCGBitmapContext))

then the desc.depth is returning 0. Not sure what to say, but if you want to 
copy the desc.pictureData, you would want to have some idea of the size of the 
data. So we have to assume that the bytesPerRow is always 4*desc.width, which 
in the cocoa runtime is not necessarily the case.. inspect the 
TIFFRepresentation docs....

Alfred
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