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Thread started 26 Jan 2010 (Tuesday) 05:40
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Color correcting your flash

 
Canonboi
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Jan 26, 2010 05:40 |  #1

I spend my vacation in the Philippines during Christmas season and New Year's, so needless to say that I have TONS of family pictures with me. But it only occurred to me just now that all my shots, especially under fluorescent lighting, my pictures have this ugly green tint in them. When I took those photos, I gelled my flash with a green gel under fluorescent lights, and 1/2 CTO on tungsten lights, then set my WB accordingly (Bulb icon for Tungsten, fluorescent for fluorescent). But why, oh why, are my photos looking like that!

Here's a sample:

IMAGE: http://img.photobucket.com/albums/v318/kailpogi/_MG_1018.jpg

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richierich1212
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Jan 26, 2010 06:17 |  #2

How do they adjust with software correction?


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egordon99
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Jan 26, 2010 06:24 as a reply to  @ richierich1212's post |  #3

In a shot like that you should have been able to use the flash for 100% of the shot. You really only need to balance the flash with the ambient when you are dragging the shutter a bit to get some ambient light in the background.

Quick way to see the contribution of flash vs. ambient light is to take two quick shots with the SAME manual settings (f-stop, ISO, shutter speed), one with the flash and one without it. If the no-flash shot is more or less black, you know that there is no ambient light contributing to the scene.

Anyway, for that shot, if you shot raw, just adjust the white balance in your raw converter.




  
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PaulB
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Jan 26, 2010 08:29 as a reply to  @ egordon99's post |  #4

The correct colour correction filter for fluorescents is an FL-D which is 30M (magenta) - which could account for the green cast...............




  
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Canonboi
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Jan 26, 2010 08:35 |  #5

PaulB wrote in post #9473539 (external link)
The correct colour correction filter for fluorescents is an FL-D which is 30M (magenta) - which could account for the green cast...............

You mean I used the wrong filter/gel?


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SnlpeR
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Jan 26, 2010 08:48 as a reply to  @ Canonboi's post |  #6

try putting both green and cto over each other and set the WB to flouresctent




  
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-=nighthawk=-
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Jan 26, 2010 09:00 |  #7

do you have photoshop? you can create an 'action' to do a color correction on all of your photos. its quite simple.

if you dont have photoshop, im sure GIMP would work too. idk if you can create 'actions' like you can in photoshop though

a quick 30 second attempt at adjusting the color balance:

IMAGE: http://i9.photobucket.com/albums/a99/Night-Hawk/agfdgfdgfdgfggsdrgr.jpg

50D 28-135mm IS USM Kit || 50mm 1.8II | Tristar UV and CPL Filters | Lowepro CompuDayPack | G6:roll:

  
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PaulB
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Jan 26, 2010 09:03 |  #8

Canonboi wrote in post #9473567 (external link)
You mean I used the wrong filter/gel?

Looks like it I'm afraid.

Where did you get the information about using a green filter to balance fluorescents?




  
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Canonboi
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Jan 26, 2010 09:10 |  #9

-nighthawk- wrote in post #9473679 (external link)
=-=nighthawk=-;9473679]do you have photoshop? you can create an 'action' to do a color correction on all of your photos. its quite simple.

if you dont have photoshop, im sure GIMP would work too. idk if you can create 'actions' like you can in photoshop though

a quick 30 second attempt at adjusting the color balance:
QUOTED IMAGE

Yes I do PS. I'm trying to correct the color balance problems in Lightroom first then PS if I have something special to do with the picture further.

PaulB wrote in post #9473698 (external link)
Looks like it I'm afraid.

Where did you get the information about using a green filter to balance fluorescents?

Here: http://blog.nikonians.​org …lash-filters-or-gels.html (external link)

They always say that fluorescent is actually green and not white, so there's that.


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richierich1212
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Jan 26, 2010 09:20 |  #10

Here's a quick correction from my laptop (non-calibrated screen):

IMAGE NOT FOUND
HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO


I just adjusted color balance under Image>Adjustments>Color Balance...hopefully you can set up an automated process to fix more than one photo at a time.

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blackhawk
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Jan 26, 2010 09:22 |  #11

Did you shot them as RAWs?


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egordon99
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Jan 26, 2010 09:28 as a reply to  @ blackhawk's post |  #12

Did you read my post above? https://photography-on-the.net …php?p=9473099&p​ostcount=3

Maybe other shots have a lot of ambient light mixed in, but in the shot you posted I would think you'd want the flash to provide ALL the illumination. And thus no need for gels.




  
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PaulB
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Jan 26, 2010 09:32 |  #13

Canonboi wrote in post #9473738 (external link)
They always say that fluorescent is actually green and not white, so there's that.

The rule for colour compensation is to use the complimentary colour to that which is causing the cast.
Fluorescents tend to give a green cast as you say but to counter that the complimentary colour needed is magenta.
To counter the warm yellow cast of a tungsten bulb the filter would be blue.

Don't know where that guy in your URL got his ideas from but in this instance he is plain wrong!

What's wrong with AWB on the camera, usually does a good job? And then use Photoshop to correct any small imbalance.




  
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richierich1212
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Jan 26, 2010 09:33 |  #14

That blogger is a Nikon user, 'nuff said....j/p :lol:


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Canonboi
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Jan 26, 2010 09:35 |  #15

richierich1212 wrote in post #9473082 (external link)
How do they adjust with software correction?

They do just fine. Of course I adjust it depending on how I remember the scene was like. Fluorescent, I like with a little bluish tint. Tungsten shots are fine. Only F is headache.


Gear: Canon EOS 7D, Canon 24-105mm f/4L IS USM, Canon 18-135mm f/3.5-5.6 IS, 430EXII, Kata 3N1-20

  
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Color correcting your flash
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