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Am 02.12.2010 23:14, schrieb Stephen Klebs:
> clipka<ano### [at] anonymous org> wrote:
>
>> On most displays, image "gammachecker_3.6.png" will show a chrome sphere
>> on a checkered plane, but there's something wrong here: The checkering
>> shouldn't be there - the plain grey tiles have a brightness of 0.5,
>> while the striped tiles have alternating lines of 0.0 black and 1.0
>> white, so should appear just as bright as the grey if you squint your
>> eyes; and in indeed both tiles appear to have the same brightness in the
>> reflection, where anti-aliasing computes the correct result.
>
> Your gammachecker_3.6 is fascinating. Is the scene file floating around
> somewhere. I assume from the title it's done in 3.6 -- if that makes any
> difference.
It's not floating around yet, but maybe it's worth adding it to the
sample scenes, if only for demonstration purposes.
> I don't really understand how this tests gamma, though, which in practical
> terms, for how I use it, has to do with the relative relation of highlight and
> midtones and shade and shadow, or in Photoshop terms, "curves."
It doesn't test the "curves" ("tone mapping"?) "gamma" thing - what it
does check is whether the purely technical thing called "gamma
correction" is set up correctly (in which case you shouldn't see any
checkered plane anywhere); however, I originally designed it as a
demonstrator for why you should do proper gamma handling; as for the
name, I just couldn't resist the pun.
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