HDR standards - DR vs DRR (dynamic range resolution)

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quadrox Senior Member • Posts: 1,373
HDR standards - DR vs DRR (dynamic range resolution)

DR - dynamic range - number of stops between darkest and brightes value
DRR - dynamic range resolution - smallest possible difference between values

Topic: It makes sense to say e.g. that a given sensor has 13 stops of dynamic range and we know both the DR and DRR - this works well for raw images (at least theoretically).

I have always assumed that e.g. an sRGB JPEG image also has a well defined DR and DRR, meaning an ideal monitor that is capable of displaying 8bit sRGB images faithfully should always have the same number of stops between pure black and pure white, even if I may increase the overall brightness of the image.

Now we are finally getting some image standards with more bit-depths, e.g. HDR10 and whatever else they are called. These sport 10 bits instead of only 8 bits, but where do these extra bits go? Do they extend the DR, and the DRR stays the same? Do they affect both? Is this even well defined?

I know that even before HDR standards we have had 10bit monitors, but as far as I know these did not feature expanded DR as such, but instead offered more DRR and expanded range for colors. Now, if we want to combine this approach of expanded color spaces with the idea of expanding the DR, don't we need more than 10bits? Why is this not a thing? Indeed, why is the industry (monitors and image standards) lagging so far behind our ability to capture images with high fidelity?

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