The ARGB value displayed is the color value mapped from 8-bit or 16-bit color to [0, 255] instead of clipping into [0, 255]. Therefore, 255 actually means the maximum color value which is 255 in 8-bit color, 1024 in 10-bit color or 65535 in 16-bit color.

There are 2 more issues based-on your question:

1. We may design an alternative way to display color value instead of mapping it into [0, 255].
2. Currently we don't support displaying HDR image. It is still a technical limitation that we need to take more time to investigate.

Ah, yes, it does run the range rather than clip. However, not very useful for checking encoding quality as the number's are not accurate. Addressing #1 would be helpful.

#2 is no small task! Certainly would be nice.

+1 for No. 1, I think reading the code value at full bit depth is important for an app like this.