On 6/15/2012 7:00 AM, Chuck Norcutt wrote:
> Very interesting but so far not understood. I'd never heard of a linear
> histogram and I'll obviously have to study it much more.
It's pretty simple. I assume you are familiar with the difference between a
graph with linear vertical axis and one with
a logarithmic axis. Not the same math, but a similar sort of effect.
> So far I have not been able to make sense of this paragraph:
>
> "We must not think that the higher concentration of information due to
> the linear development means we are losing tonal richness. This is not
> like that at all, in fact a gamma corrected histogram starts from a
> linear one to which a gamma correction curve has been applied and that
> is why a lot of holes are created in the low end of gamma corrected
> histograms. The tonal richness is not increased nor reduced for using
> one or the other kind of image."
Maybe it makes sense in the original Spanish?
> The digital representation of the numbers constituting the tonal
> information must be much different than what I would imagine looking at
> figure 6.
It has nothing to with 'digital'. Both figures 5 & 6 are representations of
exactly the same digital data. 6 is the data
as it comes out of the sensor. 5 is the same data redistributed, via the gamma
function, to look correct to human eyes.
You've only ever seen histograms after gamma is applied.
Non Linear Moose
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What if the Hokey Pokey *IS* what it's all about?
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