Just in the way of general observation, with both the A1 and the 5D if
there is a color channel that's clipped it's most likely the red
channel. I don't know why.
Chuck Norcutt
Moose wrote:
> Chuck Norcutt wrote:
>> Thanks to Dr. Exposition.
> That the fellow always going to Expos, meeting and conferences?
>> If he hits me over the head a few more times with "look at the histogram" it
>> may finally sink in.
>>
> Would that it were so easy. If you look at the histogram for the whole
> image, there are clipped highlights in all three channels. There are
> more in the red channel, but not an apparently troubling amount. The
> histograms in the sample I posted are for the smallish area outlined on
> the image. In that limited area, what is happening to the red color is
> obvious.
>
> I'm not sure why the problem seems to be particularly apparent with red,
> but it is so from experience. As Wayne H. proposed: "It may be a digital
> thing, some flowers reflect strongly outside the visible spectrum and
> digital often behaves differently to film there (e.g. if there is a
> strong IR response)."
>
> I know this was a film image, but there is no reason a particularly
> bright, strongly red flower with lots of IR might not have the same
> effect on film. I don't believe the chemical composition of film has
> such narrow frequency cut-offs that some IR sensitivity is not necessary
> to capture all visible reds. I do think the effect is more common with
> digital, though.
>
> Chris Barker wrote:
>> I'm sure that that's a beautiful shot, Graham, but colour looks wrong on my
>> monitor. It seems always to be the case with poppies when I take photos:
>> digital does not like that colour.
>>
> One thing to try is taking intentionally underexposed back-up shots of
> such flowers. As long as the reds aren't blown, you should be able to
> get brightness and tonal distribution correct in post.
>
> I suppose a UV or 1A filter wouldn't hurt for the poppies. Perhaps even
> an 80A and a neutral colour reference card in a shot to give proper
> correction for the cast it will give normal colours.
>
> Moose - on behalf of the elusive (illusive? illustrative? illustrious?
> illuminating? alliterative? allusive?...) Dr. Exposition
>
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