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CIColorMap filter usage

Does anyone have any experience with using the core image CIColorMap filter? I have tried looking at the example in the FunHouse example, but I still can't get it to work, even using the same example image and color map from the FunHouse project. I end up with a greyscale image. Here's my code...

// color map
NSURL *url = [NSURL fileURLWithPath: [[NSBundle mainBundle] pathForResource: @"colormap" ofType: @"tiff"]];
colorMap = [CIImage imageWithContentsOfURL: url];

// test image
NSURL *url = [NSURL fileURLWithPath: [[NSBundle mainBundle] pathForResource: @"Copenhagen" ofType: @"jpg"]];
CIImage *testImage = [CIImage imageWithContentsOfURL: url];

// filter
colorMapFilter = [CIFilter filterWithName:@"CIColorMap"];
[colorMapFilter setValue:testImage forKey:@"inputImage"];
[colorMapFilter setValue:colorMap forKey:@"inputGradientImage"];
resultImg = [colorMapFilter valueForKey: @"outputImage"];

// draw the result
[context drawImage:resultImg atPoint:cg.origin fromRect:cg];

Thanks!
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