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Thread started 22 Apr 2010 (Thursday) 14:00
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Why is the red in this shot smeared?

 
anthony11
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Apr 22, 2010 14:00 |  #1
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I know this is arguably slightly overexposed, but the histogram doesn't appear to show clipping. So why is his red shirt smeared? I can reduce exposure or the saturation / luminance of the red channel to get texture in the shirt, but that horques his face.

Shown is a screen capture of Lightroom with defaults. The CR2 is here:

http://www.beak.org …-14_17.05.04+IMG_7097.C​R2 (external link)

Advice on how to best process this shot, and how to avoid smearing in the future would be much appreciated.


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kirkt
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Apr 22, 2010 14:09 |  #2

Try using a different camera profile from the "Adobe Standard" (try Camera Faithful or Camera Neutral) and see if that tones the reds down a bit (try some Recovery, as well). You can also dial the reds back a little with the HSL slider for red. This is apparently becoming epidemic, as this is something like the third post this week about reds getting frazzled in LR.

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tonylong
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Apr 22, 2010 14:26 |  #3

In essence, the red channel looks good on the histogram because the histogram reflects the wide-gamut color space that Lightroom uses internally, whereas your monitor can't display that wide space -- your monitor is closer to displaying the sRGB color space. You will find if you look at an sRGB histogram that the red channel will be clipped.

The camera captures a larger gamut still, but for practical purposes you either want an sRGB-compatible image or you need to know that stuff like this can happen. How it will print is another matter entirely -- some printers could handle this, others not.

Here is a recent thread about this:

https://photography-on-the.net/forum/showthre​ad.php?t=859118

If you want to get a visual look at how they relate, you can use either ACR (Adobe Camera Raw) that comes with Photoshop if you have it, or DPP (Digital Photo Professional) that is the Canon Raw software. Both of these tools have a switchable color space that is reflected in the RGB histogram (with DP it is in the RGB tab). You can watch the sRGB-tuned histogram as you tweak the Red channel brightness and saturation to tone things down (you may want to tone the whole image down a bit to start with -- it just needs playing around).

You can get the same results in Lightroom, but the histogram will be no help. The HSL panel will enable you to tone down both the Saturation and the Luminance of the Red channel. Like I say, you may need to work with some of the global controls to balance things out as well.

Hope this helps some!


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TTk
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Apr 22, 2010 14:48 as a reply to  @ tonylong's post |  #4

This image looks better using Neutral in Lightroom 3B2 and ACR 5.7 and it dose show in ACR that the red's are clipped, with a few tweaks the red in the jumper should recover ok.;)


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René ­ Damkot
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Apr 24, 2010 07:30 |  #5

tonylong wrote in post #10046030 (external link)
In essence, the red channel looks good on the histogram because the histogram reflects the wide-gamut color space that Lightroom uses internally, whereas your monitor can't display that wide space -- your monitor is closer to displaying the sRGB color space. You will find if you look at an sRGB histogram that the red channel will be clipped.

Bingo.

http://www.getcolorman​aged.com …management/clip​warninglr/ (external link)


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Why is the red in this shot smeared?
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