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Old 21-05-2009, 21:13   #1 (permalink)
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Red Flowers

Can anyone please explain to me what I'm doing wrong ?

Whenever I photograph a red flower I finish up with an unsightly blob, with no apparent definition and certainly no appeal; [unless it is to be thrown in the bin]

Help !!!!!!!!!!!!!!!

Any other colour flower comes out just fine, by the way.
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Old 21-05-2009, 21:15   #2 (permalink)
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Re: Red Flowers

try posting an image of what you get, so we can see exactly what's going on.
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Old 21-05-2009, 21:37   #3 (permalink)
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Re: Red Flowers

Sounds like you may be clipping the red (like burning to white but only one colour, red, overpowering the sensor), not helped by sRGB being notoriously bad at displaying red detail. The histogram will show if clipping is occuring - use exposure compensation to control when taking the shot and take care in processing not to introduce further clipping
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Old 22-05-2009, 13:53   #4 (permalink)
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Re: Red Flowers

Almost certainly clipping. It may be difficult to avoid if you are using JPEG files and sRGB. If you use Raw files you should be able to avoid these problems.

I remember having colour clipping years ago when I was scanning slides taken of Autumn leaves in bright sunlight. I had to reduce the analogue gain in the scanner to prevent clipping and used Adobe RGB (1998) colour space.

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Old 22-05-2009, 14:00   #5 (permalink)
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Re: Red Flowers

Nothing showing here.
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Old 22-05-2009, 14:03   #6 (permalink)
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Re: Red Flowers

Quote:
Originally Posted by simpbow View Post
Nothing showing here.
I don't think an image has been posted - just the question.
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Old 22-05-2009, 21:18   #7 (permalink)
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Re: Red Flowers

Hello all.
sotelo - this is what I regularly finish up with.


I'll have to research 'clipping', Markulous. It's anew one on me
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Old 22-05-2009, 21:53   #8 (permalink)
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Re: Red Flowers

Quote:
Originally Posted by Markulous View Post
The histogram will show if clipping is occuring -
use exposure compensation to control when taking the shot and take care in processing not to introduce further clipping
Markulous:
1. What will the histogram display? An over-concentration of RED ?
2. Which direction do you suggest I compensate (+ or -) ?
(won't the compensation apply to all factors of the exposure - not just the red?)
3. In what sense do I need to "take care when processing" ?
and finally
4. Why is it [whatever 'it' is] termed "clipping" ?
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Old 23-05-2009, 09:40   #9 (permalink)
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Re: Red Flowers

Quote:
Originally Posted by strokebloke View Post
1. What will the histogram display? An over-concentration of RED ?
As per:


Histogram (of your image) showing just the red channel distinctly shows the data making up the image well over to the RHS, indicating clipping

The luminosity shows the clipping and burning so, again, data over to the RHS

The colors is a much more typical in-camera view and is not quite so obvious - but you can still see data over to RHS indicating burning and/or clipping

Quote:
Originally Posted by strokebloke View Post
2. Which direction do you suggest I compensate (+ or -) ?
(won't the compensation apply to all factors of the exposure - not just the red?)
A bit of -ve compensation - yes, will affect all colours/image

Quote:
Originally Posted by strokebloke View Post
3. In what sense do I need to "take care when processing" ?
It is possible to introduce clipping/burning in PP (by making it brighter) just as it's possible to reduce/eliminate clipping/burning (especially if RAW used)

Quote:
Originally Posted by strokebloke View Post
4. Why is it [whatever 'it' is] termed "clipping" ?
Dunno! Maybe because the "peak" of data is chopped off and so clipped!
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Old 23-05-2009, 17:28   #10 (permalink)
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Re: Red Flowers

Mark, thank you for all of that - your time and explanation, presentation etc
Very much appreciated.
As you imply, and sotelo suggests, i will do some experiments using RAW rather than jpeg.

Many thanks
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Old 23-05-2009, 20:05   #11 (permalink)
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Re: Red Flowers

~CanonCreativity + SigmaSurReality~
by ΜΛЯΚ

It works for Nikon too !!!!! Mark.
You're a star.
I've just aken 4 quick shots of some of the wife's small red begonias, in RAW.
The first at a -0.3
The second at -0.7
The third at -1.0
The fourth at -2.0 compensation.
For the conditions that the shots were taken in,
[the back garden with the sun presently setting on the front garden]
-0.3 seemed about the best. Defineably red petals, no less. By the time it was at -2.0 the whole image was so glum, I almost felt sorry for it. But it has at least identified the cure.
I haven't yet looked at the histograms & haven't done any processing either, so have still some more to do to fully understand the solution [& inversely, the problem]

But thanks for the direction.
("clipping" - another thing I've learned )
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Old 23-05-2009, 22:16   #12 (permalink)
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Re: Red Flowers

This is what I now get, shooting RAW [NEF]
-0.3 comp AP Page Ranking f8 - 1/10s ISO 200 AutoWB 70-210/85mm


This will never be a prize-winning photo, nor is it likely to set Pixalo alight, but it is much more acceptable, in my view. I have done nothing to it except convert to jpeg file format.
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Old 23-05-2009, 22:18   #13 (permalink)
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Re: Red Flowers

AP Page Ranking, was supposed to be Aperture Priority, by the way.
The progr thought it would "do-its-clever-assumption-stuff"

I've also found some articles on RAW & 'clipping' in recent mags. So will be reading well into the early hours

Last edited by strokebloke; 23-05-2009 at 22:20. Reason: added info
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