Need Help Displaying a Floating-Point Image

FROM : Robert Murley
DATE : Fri Aug 04 18:52:58 2006

I have an NSBitmapImageRep with floating-point data samples. When I 
attempt to display it, I get all white. Using the same code with 8-bit 
integer samples works fine. The FP samples are all between zero and 
one, and the alpha channel is all ones.

Could anyone enlighten me as to what I am doing wrong?

Code to create the image rep:

NSBitmapFormat format = NSAlphaFirstBitmapFormat | 
NSFloatingPointSamplesBitmapFormat;

imageRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: data
pixelsWide: width
pixelsHigh: height
bitsPerSample: 32
samplesPerPixel: 4
hasAlpha: YES
isPlanar: YES
colorSpaceName: NSCalibratedRGBColorSpace
bitmapFormat: format
bytesPerRow: rowBytes
bitsPerPixel: 32];

Code to display it:

    IBOutlet NSImageView *imageView;
    NSImage        *image;

- (void) displayView: (NSBitmapImageRep *) imageRep
{
   image = [[NSImage alloc] init];
   [image addRepresentation: imageRep];
   [imageView setImage: image];
   [imageView display];
}