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Thread started 05 Mar 2011 (Saturday) 23:40
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Is there pink in this sky?

 
ncjohn
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Mar 05, 2011 23:40 |  #1

I took this picture on my first outing after getting my DSLR, last March. I took about a dozen similar shots and I've looked at them many times since then. Tonight as I was looking for a particular shot, I happened to notice that there is a lot of pink in the sky. I've never seen that before, and because I've been playing with new calibration software, I wonder if the pink is really there in the image or if my screen is a little out of whack now.
So, is the pink really there? (By the way, this is a straight convert-to-jpg from RAW with no PP.)
Thanks.

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Mar 06, 2011 00:06 |  #2

I don't see any pink.


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AtSea
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Mar 06, 2011 01:17 |  #3

Hmm, not sure I see what you mean exactly either


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Mar 06, 2011 01:19 as a reply to  @ AtSea's post |  #4

In extreme overexposures (total blow out) you will sometimes see pink patches appear.

Your sky here is a good candidate for such an occurrence.


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kjonnnn
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Mar 06, 2011 01:20 |  #5

Yea I see pastel pink in parts.




  
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tdodd
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Mar 06, 2011 02:04 |  #6

Your sky is not pink. Most of it is completely blown in all three channels. The rest of it is pretty much bang on white or very, very light grey. Odd bits do have a blue bias. Some areas may have a slight red bias, but I think this is perhaps due to picking up twigs that are barely visible and yet which taint the image, or maybe there is a little CA around the twigs and branches. Lastly there could be a bit of an optical illusion where the eye is inventing complementary colours.

One way to check - use the colour sampler/dropper and look at pixel values. Another way - drop the exposure and boost saturation and see what pops out. Here's how it looks with exposure at -2, recovery at 74 and saturation at 100. I would say that you do not have a pink sky. If it looks pink to you then your monitor is off or your eyes are deceiving you.


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tzalman
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Mar 06, 2011 04:44 |  #7

The sky is blown out. You should see it as pure white.


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Levina ­ de ­ Ruijter
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Mar 06, 2011 07:34 |  #8

This is just a blown out sky and tons of chromatic abberation.


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kirkt
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Mar 06, 2011 07:49 |  #9

Which camera and raw conversion software are you using that is giving you pink blown out areas? This can happen when the raw saturation level in the raw conversion process is incorrect.

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René ­ Damkot
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Mar 06, 2011 08:16 |  #10

Levina de Ruijter wrote in post #11965659 (external link)
This is just a blown out sky and tons of chromatic abberation.

^^^This.


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ncjohn
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Mar 06, 2011 10:53 as a reply to  @ René Damkot's post |  #11

It's not the RAW converter because I see it in the RAW thumbnails. It's the most visible when DPP is in the process of generating a high quality image, when the image is fuzzy. It looks like tdodd's image

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only not quite that extreme. It's strongest around the branches.

Using the info tool, I don't see any color cast at all. Wouldn't chromatic aberration cause an actual color cast?



  
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ChasP505
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Mar 06, 2011 11:56 as a reply to  @ ncjohn's post |  #12

Yeah, you often see chromatic aberration or fringing when you shoot a hard dark edge (tree branches) against a blown out white sky. Better lenses are more able to suppress this phenom. I use a Photoshop plugin filter called PTLens which helps, in many cases, to suppress CA, but I understand that PS cS5 and LR3 can do the job equally well.


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ncjohn
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Mar 06, 2011 12:04 as a reply to  @ ChasP505's post |  #13

Well that makes sense but, again, if it comes from the lens, seems like it would be part of the image, which means that the info tool should show the color, instead of showing 255,255,255.????

Pretty impressive filter!




  
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Levina ­ de ­ Ruijter
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Mar 06, 2011 12:06 |  #14

Chromatic aberration is not a colour cast but are ugly colour fringes (often purple, but also cyan, red, green or yellow) where there is a strong contrast between dark and light. In this image with those thin twigs and that totally blown out sky, the CA is so thick that it is not limited to the edges of the branches and twigs but many of the twigs and branches coming in contact with that sky have turned purple and cyan altogether.

PS: Good glass helps reduce CA, but you still get it...


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ChasP505
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Mar 06, 2011 14:17 as a reply to  @ Levina de Ruijter's post |  #15

If you want to experiment with it, a good way to induce CA is to shoot from within a dim parking garage structure out to an exceedingly bright and overcast sky.


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Is there pink in this sky?
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