Some apps might only display 8bpc but they might dither the image so it looks like 10bpc. You might get a different result using Quick Look in Finder.app versus Preview.app. The next problem is how to display the image. It might be impossible to notice banding in the 10bpc row which is above the 8bpc row. For each band of 6bpc you should be able to see 4 bands of 8bpc. For 8bpc you may be able to see the banding by zooming in. With the image generated by the above code, you should be able to see gradients of 12bpc, 10bpc, 8bpc, 6bpc of each color (grey, red, green, blue, yellow, cyan, magenta).
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