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Thread started 28 Jun 2008 (Saturday) 19:05
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Color Temp. Problems

 
Sharlene
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Jun 28, 2008 19:05 |  #1

I wanted to see if anyone has had this problem or knows how to fix it. I am using a Canon 5d and AB lights in my studio. For some reason, my skin tones look ok to me, but colors of clothing or props are altered, and don't look the same. For example, with this picture below, me and my daughter playing around in the studio, my shirt looks dark pinkish-purple, but in person, the color of my shirt is light grape purple! Any ideas???

(picture straight out of camera)

IMAGE: http://i82.photobucket.com/albums/j274/bitybabynurse/Test-IMG_9943.jpg

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cdifoto
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Jun 28, 2008 19:10 |  #2

Is your screen calibrated? Your shirt looks more magenta-reddish to me, and the skin has a pinkish hue.

Either way, the best thing you can do is shoot a grey card under the lights as a reference shot either for RAW eyedropper use or to set a custom white balance. Grey cards are cheap as chips at your local camera shop.


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Sharlene
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Jun 28, 2008 19:15 |  #3

Yep, I've tried doing a custom wb, and still have the same problem, i've calibrated my monitor, and still have the problem. I've tried ps and just end up screwing everying else up with skin tones and stuff. when i look through my screen on camera it looks off too.


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cdifoto
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Jun 28, 2008 19:17 |  #4

Hmm. Odd. Have you tried shooting RAW and then using the eyedropper on the grey card? It could be your RAW converter not reading the CWB properly (assuming you do shoot RAW).

List out your exact workflow...maybe we can spot problems.


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Sharlene
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Jun 28, 2008 19:20 |  #5

ok, here i go, #1. I'm RAW challenged.
2. I don't have a gray card, but I do CB to a white foam core board, (gray card is on the ups truck!) (maybe this is my problem?) sometimes I just AWB if I'm being lazy.
3. Then they go to CS2 for editing.


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Titus213
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Jun 28, 2008 21:14 |  #6

Interesting challenge. I pulled your image into ACR and did a white balance off your eye. The color looked better. The temperature was -3 but tint was -28. Now I'm not sure how those numbers relate to actual temp in Kelvin but it looks better. I also bumped the exposure by .25.


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AndreaBFS
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Jun 29, 2008 00:12 |  #7

Do you keep any other room lights on at the same time? I really botched my white balance, even using custom, just from having different light temps going on in the room. It was an easy fix in curves, so probably not.... but worth asking. :)




  
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cdifoto
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Jun 29, 2008 00:54 |  #8

Sharlene wrote in post #5811131 (external link)
ok, here i go, #1. I'm RAW challenged.
2. I don't have a gray card, but I do CB to a white foam core board, (gray card is on the ups truck!) (maybe this is my problem?) sometimes I just AWB if I'm being lazy.
3. Then they go to CS2 for editing.

Not all whites are created equal, & that's why it's best to use a grey card that was manufactured specifically for the purposes of white balance and exposure.

Titus213 wrote in post #5811620 (external link)
Interesting challenge. I pulled your image into ACR and did a white balance off your eye. The color looked better. The temperature was -3 but tint was -28. Now I'm not sure how those numbers relate to actual temp in Kelvin but it looks better. I also bumped the exposure by .25.

It doesn't mean anything on the Kelvin scale, since Kelvin is absolute but the + and - of the JPEG sliders are relative.


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Sharlene
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Jun 29, 2008 12:35 |  #9

Thanks guys! I do have these awful can lights in the ceiling scattered across the room, I can't remember if I had them off or on. I think I had them off ?? I'm getting my gray card on Wednesday, so I'll see if that helps!


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Bill ­ Boehme
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Jun 29, 2008 14:23 as a reply to  @ Sharlene's post |  #10

My eyeball estimate says that the WB is not correct because the skin tones look too blue.
When all of the various colors do not seem to be quite right and you do have a proper WB, it means that you should profile your camera sensor in ACR. Equipment needed is a Gretagmacbeth color card and a true reference digital version of the chart. Real World Adobe Photoshop ACR has instructions for doing this, but there are probably many sources on the web that have plagiarized this information.


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Titus213
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Jun 29, 2008 16:29 |  #11

Sharlene wrote in post #5814959 (external link)
Thanks guys! I do have these awful can lights in the ceiling scattered across the room, I can't remember if I had them off or on. I think I had them off ?? I'm getting my gray card on Wednesday, so I'll see if that helps!

I'd bet that it does help. Just use it to set a custom WB in the camera rather than as a reference for correction in ACR. Both work but custom in the camera works better I think.


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fenceiner01
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Jul 03, 2008 20:55 |  #12

this look any better?


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Titus213
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Jul 03, 2008 21:03 |  #13

fenceiner01 wrote in post #5845103 (external link)
this look any better?

Not at all.


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LeuceDeuce
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Jul 03, 2008 21:46 as a reply to  @ Titus213's post |  #14

Is this close to what you're looking for? Your shirt isn't what I would consider "grape" but it's definately a more burgundy colour here. The skin tones and neutrals are realistic as well. Curves in conjuction with color picker, Channel blending.
_


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LeuceDeuce
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Jul 03, 2008 22:11 as a reply to  @ LeuceDeuce's post |  #15

We can also do grape purple, but that's not something I can achieve with a simple colour balance. Hue shift, and masking.
_


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