On the dynamic range of RAW...

Started Nov 30, 2004 | Discussions thread
OP Brian G. Veteran Member • Posts: 6,531
Re: Seems to work very well.

Hi Eric,

Eric_17 wrote:

I agree on all Typeaux wrote. The color version looks very good.
Also the color in this particular case does not add anything to the
artistic vision.

I agree. Frankly, I don't much care for this shot at all (it was just a test shot), but if I had to pick, I'd pick the B&W.

As far as color quality, I think the color works in this case
because Brian hand-blended the two versions together which tends to
keep the two exposures separated. Another method is using a mask
based on the highlight-map or shadow-map which more accurately
(mathematically) blends the two exposures together at the loss of
saturation. I'd post what I mean if I had PS in front of me
I'm actually for hand-painting myself.

There seems to be some visible noise in the wall. Is it my
imagination?

No, it's real, but not too surprising to me as it was an ISO1600 shot pushed 4EV.

At any rate, thanks Brian for your time and trying the color version.

No problem at all, Eric. Happy to help.

Kind Regards,
Brian

Typeaux wrote:

I understand Eric_17's assertion about increased dynamic range (DR)
decreasing contrast since doing so increases the range of greyscale
available and thus makes the transitions smoother and less
"contrasty."

I also know that color becomes desaturated with more dyanmic range.

Knowing all of that does not change the fact that increased DR
makes more highlight and shadow detail available. Once those
details have been brought out, further post processing can
selectively increase contrast and color saturation as desired,
while retaining all or most of the detail recovered by increased DR.

I'm impressed with the color version, and don't think more
saturation would work with this image. Sometimes more contrast and
saturation is desired, and sometimes it is superfluous (as is even
color itself, for some images).

To be honest, I am not sure anything has been added to this
particular photograph by the introduction of color to the image,
other than to illustrate that your demonstration does work for both
monochrome and color shots under these extreme conditions.

Thanks again for your time and for making this subject more
accessible for so many of us.

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Typeaux

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