On 9/8/2011 11:01 AM, Jim Nichols wrote:
> In continuing to get a better understanding of proper exposure as it applies
> to the E-1 and its CCD sensor, I finally got a brief period of sunshine, and
> took a few more images. I should mention that articles I have read report
> that ETTR will be helpful IF the range of brightness of the subjects does not
> exceed the range that the sensor can capture.
>
> An extreme range of brightness showed me that I could not find a setting
> capable of capturing the full image without blowing the highlights. This
> example was about as good as I could do, and it used EV +1.3.
> http://gallery.leica-users.org/v/OldNick/P9081077edit.jpg.html
>
> Using this same setting worked very well in capturing an image containing a
> lot of shadow area.
> http://gallery.leica-users.org/v/OldNick/P9081079edit.jpg.html
OK, I'll admit to some confusion. The subject is ETTR (Expose To The Right).
That means, in common usage, pulling
exposure down (usually negative EV compensation) in order to avoid highlight
clipping. In ideal ETTR of typical
subjects, just a few pixels may reach a value of 255 in one or more channels,
but no pixels, in any channel, would have
required a higher value, if it were available, but were clipped to 255.
This is done where the camera/film can't capture the whole DR of the subject
and the photographer decides to sacrifice
shadow detail to avoid blowing highlights.
What you have done in these two examples is the opposite, exposing to retain
shadow detail at the expense of highlights,
i.e. ETTL(eft). There are huge areas of the first example where the image has
gone pure white, all tonal and textural
detail in the highlights just gone. Tonal detail in the shadows is nicely
retained, but it's strictly OOF background, of
no importance I can see to the image. Personally, I think it looks awful, but
tastes vary.
The second one isn't as bad. Although there are still areas badly clipped, they
are much smaller. Again I don't see
where the deep shadow tonal detail contributes to the overall image, whereas
the blown highlights detract from it.
The next image in your gallery has a close to perfect ETTR histogram, with just
a small amount of clipping. In fact,it's
a pretty good exposure, with only a small amount of shadow clipping that will
never be visible. Taken in flat light,
+1/3 EV was good; +1 1/3 would have ruined it. As is usual with properly
designed cameras in proper adjustment in flat
light, 0 EV, no adjustment, would have been a perfect.
Exposed Moose
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