On 1/28/2014 6:53 AM, Ken Norton wrote:
> ETTR is ONLY valid if you shoot RAW, unless you are photographing a
> subject where placement of the highlight at Zone IX is critical.
On 1/28/2014 7:08 AM, Chuck Norcutt wrote:
> ...
>
> Umm, no. If I have to "recover" highlights I haven't done the ETTR
> thing correctly.
On 1/28/2014 7:24 AM, Ken Norton wrote:
>> No, I'm not. I make it a practice to assure that none of my colors are
>> clipping.
> Impossible. The in-camera histogram is generated off of an in-camera
> JPEG and also shows only the primary (RGB) colors, not the derived
> colors (CMY). You can have the yellows clip and never know it. The
> only thing you can do it ETTR and then back off one stop to be safe.
Is it possible you guys are arguing about definition, not substance? It's seems
to me you may be arguing past each other
about different ideas about what ETTR is, rather than about real differences?
Reading this thread, it sounds to me like AG is using ETTR as an absolute,
perhaps defined by some of those (possibly
imaginary) unnamed web folks with whom hs is always arguing. He is arguing with
a dogma, dogETTR. He assumes it must
involve highlight recovery, else why would he harp so much on the perils of
highlight recovery, and why would ETTR be
invalid for JPEGs?
OTOH, Chuck seems to be attempting to practically shoot as high up the
histogram as possible without clipping
highlights. No dogma, just pragmatic experience, pettr.
I'm closer to Chuck's idea. I'd like to have a Raw histogram that just barely
falls short of touching the top on any
channel. In practice, this is very difficult to achieve outside a controlled
environment. So I try to pay reasonable
attention to doing that. Highlight recovery is then a fallback when I miss.
This is, or should be, about practical technique to optimize digital exposure
to minimize highlight clipping while
retaining the best shadow possible, not absolute definitions.
It's also far less of a problem with contemporary cameras with wider DR. One
need worry less about nailing just that
one, highest pixel to the very top of the flagpole.
--- Side note ---
Some JPEG engines do quite a good job of compressing highlights, rather than
clipping them. It often looks like clipping
when viewed as a web image. But if one selects highlights and looks at the
histogram, little or nothing is clipped.
Knowing this is one of the side effects of messing with a lot of other peoples'
images, as I shoot Raw.
When it's the case, it's generally possible to 'recover', make visible,
highlight detail that was there, but not
visible. I've posted quite a number of examples over the years.
Definitional Moose
--
What if the Hokey Pokey *IS* what it's all about?
--
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