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>HDR doesn't imply you can represent smaller differences in illumination level within the representable range of levels. It doesn't? Dynamic range and resoluti

>HDR doesn't imply you can represent smaller differences in illumination level within the representable range of levels. It doesn't? Dynamic range and resolution are directly related. Dynamic range isn't "range." This is why an HDR image has greater bit depth (more bits). Greater bit depth implies more resolution. All things being equal, a system with higher dynamic range can convey smaller signals. More accurate information is able to be conveyed, which requires greater bit depth. There are even formulas for calculating the theoretical dynamic range of a digital system given its bit depth.

dragonwriter 9y ago
> Dynamic range isn't "range." In the application under discussion, it's the ratio between the highest and lowest representable illumination level. This is, I think, very clearly “range” in the usual sense. > Greater bit depth implies more resolution. But it doesn't, in the same way that frame rate (temporal resolution) differs from run time (temporal range). Now, the difference is in the what the output device does with the data (since data intended to support one use could be interpreted and used for the other, with a 120fps stream played at 24fps with 5 times the runtime, or vice versa), not the representation format, but the whole point of HDR is representing wider differences in illumination, not resolving smaller differences between the same minimum and maximum.