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Re: [OM] IMG: Friday Flower - Jim N.

Subject: Re: [OM] IMG: Friday Flower - Jim N.
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Sat, 11 Jun 2011 00:42:29 -0500
Thanks, Moose.  You are right, the red channel was clipped slightly.  I 
should have pulled it back more in RAW processing, but, when I did, I didn't 
like what I got.  Will try harder next time.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Moose" <olymoose@xxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Friday, June 10, 2011 11:43 PM
Subject: Re: [OM] IMG: Friday Flower - Jim N.


> On 6/10/2011 5:45 PM, Jim Nichols wrote:
>> The combination of late afternoon sun and the camera's color rendition
>> changed the color slightly.  She is probably correct.
>
> Jim, you've been doing a great job lately of avoiding blown highlights in 
> red and yellow flowers.
>
> What's happened here to make the color go wrong isn't the sun, at least 
> not primarily so, nor the camera's inherent
> rendition. Actually, this is a great example for teaching. :-)
>
> It's obvious at first glance that there is something 'off', esp. in the 
> flowers. Seems like the colors are lacking snap,
> contrast is low, 'something'. If you look closer at the flowers, esp. at 
> the larger size, there are large areas that are
> all just one color, very unnatural for flowers. Then I hear apparently the 
> color is off.
>
> That's all from clipping in one channel, in this case, the most common one 
> for flowers, red. Take a look at the
> histogram. 
> <http://www.moosemystic.net/Gallery/Others/Nichols/Mothers_Day_Basket_5_Wks_Later.htm>
>
> The overall histogram doesn't look too bad, and that can fool you. The red 
> channel is heavily clipped. That means many
> pixels have the same value, 255, for red, while green and blue are normal. 
> What that does is make the red highlights
> less red than they should be, both relative to less bright reds and 
> relative to the rest of the image.
>
> It also loses tonal differences in the red highlights, so that the natural 
> variations can turn, as here, into one,
> undifferentiated color.
>
> As a side note, the same thing can affect shadows, giving them a color 
> cast that isn't in the subject. Here, the shadows
> may be a little less blue than is accurate. But most people don't notice 
> that; can you imagine Siddiq suggesting that
> the shadows are off in this image? It looks fine to me, too. We're looking 
> at the flowers, anyway.
>
> Moose
> -- 
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