Moose wrote:
> Sue Pearce wrote:
>> I don't understand how details obscured by haze ...
>>
>
> The concept is pretty simple.
Replying to myself - Brian was kind enough to provide some lovely
landscapes, and excellent examples for practical answers to your
question. <http://www.moosemystic.net/Gallery/Others/BSwale/PA160519.htm>
and <http://www.moosemystic.net/Gallery/Others/BSwale/PA270640.htm>
Not quite finished products. There is a halo on the dark land lower left
and sloppy land/water transition in one and a little around the jet in
the other. There wouldn't be those issues working with original size images.
And they may be a bit over done to prove the point. But I think you will
see more clearly what I was talking about.
Moose
>
> Suppose I shoot a nice, black and white Holstein cow with a long lens
> through hazy air. The black part becomes a bluish dark gray and the
> white part becomes a bluish light gray. The effect may even be so bad
> that I can't really distinguish the markings at all.
>
> However, in a digital/digitized image, as long as most all of the once
> white part pixels are tonally higher than all of the other part, it's
> relatively easy to restore the contrast and compensate for the blueish
> cast.
>
> In fact, if I shot a painting of a cow done only in pure white and
> black, it can be completely restored as long as the tonal values of
> the two parts are at least one step apart. Lower everything below that
> value to black and everything else to white and you have recreated the
> subject.
>
> In the real world, of course, it's not quite as straightforward. For
> one thing, aside from haze, there is usually loss of detail from air
> movement. And little in our typical images is pure black and white.
>
> Nevertheless, it is often possible to recover a great deal of the
> original color and contrast. If you have followed my adventures in
> creating alternate versions of images posted here, you have seen many
> examples. Much more can be recovered in the digital darkroom than
> through use of a haze filter.
--
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