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Displaying an image with floating point samples

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

Code to create the image rep:

NSBitmapFormat format = NSAlphaFirstBitmapFormat | NSFloatingPointSamplesBitmapFormat;
bitsPerSample = 32;

imageRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: data
pixelsWide: width
pixelsHigh: height
bitsPerSample: bitsPerSample
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];
}
:

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