Anthony Farr wrote: > You need to click the "DETAILS" tab under the image to show the caption. > PhotoNet would rather show you an advertisement when the page first loads. > > What the scales show is that an unmanipulated linear greyscale produced by a > digital camera has considerably darker shadows than a non-linear greyscale > produced by film. Correcting the difference in levels leads to nasty > posterisation bands in the shadow tones. > > These are 8bit scales and each step is as near to true as I could get (one > or less levels error) so 12 or more bits will be better, but the correction > of the linear greyscales to anything like the evenly spaced tonal rendition > of the non-linear greyscales will always be an inferior option unless > considerably greater bit depth is offered. It would be much better if > digital cameras could output files with a non-linear characteristic curve. > Except that the sensor is linear- if it's a CCD anyway. It's a photo (okay, electron) counter. If you digitize the output in a non-linear space, you're not getting as much (good) information as if it was a linear digitization.
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