Color correction by using color temperature

Corsairbuff wrote on 2/1/2013, 8:57 AM
If this has been talked about on the forum elsewhere sorry to bother.

A while ago we did a multi camera shoot. Each camera has multiple white balance presets. One of the cameras was accidently set to 56K instead of 32K for part the shoot before it was noticed. Nothing was said at the time so now in post the problem must be solved. I’ve done small corrections using Vegas’s color wheels with reasonable success. This is my first attempt at 'drastic' color correction. I've tried everything I know using Vegas's color wheels and cannot get the images close enough to be acceptable. Is there a way that I can tell Vegas or some other program what the color temperature was and either pick the temp it should have been or a slider bar to move it closer to where it should have been since color temperature is a constant? Thank-you for any advice you can give in helping me with my dilemma.

Comments

Corsairbuff wrote on 2/1/2013, 8:58 AM
I forgot to mention I'm using Vegas 8 for this project.
rs170a wrote on 2/1/2013, 9:02 AM
Post a full res screen shot or, even better, a short video clip (preferably with some white and black in it) and I'm sure we can come up some values for you to try.

Mike
AlanADale wrote on 2/1/2013, 9:21 AM
Alternatively you could download this plug in http://www.fbmn-software.com/en/color-match.html which by things that I've read on here is very very good. It has a free trial so you can try it and see whether or not it's an easy fix for your current problems. There's also an instructional video on the same page so you can watch that first if you like.
Enerjex wrote on 2/1/2013, 9:52 AM
I'd usually use a combination of white balance and color correct to fix that, but from memory v8 doesn't have white balance. Maybe give AAV colorlab a go, it's free and has white balance, albeit a very basic one. It could get you out of trouble though.
musicvid10 wrote on 2/1/2013, 10:21 AM
That big a white balance error is not going to go away easily. Posting a good screenshot will let others here work on it and offer different solutions. Also a screenshot of the good WB you're trying to match.
Corsairbuff wrote on 2/1/2013, 11:18 AM
Thank-you very very much for the quick answers. Will post pics shortly.

Do you think there will every be an app or plug-in that will allow color changes by color temperature? What problems would there be in that?
musicvid10 wrote on 2/1/2013, 11:25 AM
Every lighting is different.
Every camera is different.
Color temperature doesn't take photometric differences into account.

Auto-balance, then lock is one stable method. Camera presets would be used only when you have no neutral white reference.
Grazie wrote on 2/1/2013, 11:43 AM
MV is correct. I've found the Canon WB presets are magnificent, and use them when I can't get anything nearby - "White Vans" are good!

Grazie

larry-peter wrote on 2/1/2013, 11:58 AM
In a lot of cases 5600/3200 WB correction isn't hard to achieve with the mentioned plugins. The real problem can be when one color channel clips prior to others in the highlights - then you'll find that the brightest part of your new "white" will be a color. I've had to use several instances of Secondary Color Correction at times to correct the color banding in highlights that some of the WB plugins can leave behind in extremely bright areas.
musicvid10 wrote on 2/1/2013, 12:18 PM
""White Vans" are good!"

"White T-Shirts" are not!
Corsairbuff wrote on 2/1/2013, 2:47 PM
I've posted some pics at

http://www.tld-productions.com/vegas/index.htm

Let me know if there is any thing else I need to upload.

Thank-you very much.
JasonATL wrote on 2/1/2013, 6:53 PM
I'm an amateur here, but thought I'd give this a shot.

In P4, is the light behind the woman changing color? The reason I ask is that I can match the painting and the woman, but the fabric behind is doesn't seem right.

By the way, to match the woman in P4, I used Sony's Color Corrector as follows:
Low: Angle: 0, Magnitude: 0
Mid: Angle: 310, Magnitude: 0.43
High: Angle: 300, Magnitude 0.60

Edit: Might also try:
Low: Angle: 0, Magnitude: 0
Mid: Angle: 305, Magnitude: 0.43
High: Angle: 310, Magnitude 0.65
This seems to work better on P6 and seems about as good as the above for P4.

These are a start and what I came up with in 10 minutes. Others can probably pull it in better.
Corsairbuff wrote on 2/1/2013, 8:00 PM
JasonATL, yes the colors are different. We set up a rainbow effect in lighting behind her on the curtain. Red on left and purple on right with most of the colors in between. It was really a cool effect. I'll plug them in the editor. Thank-you very much.
JasonATL wrote on 2/1/2013, 8:02 PM
In coming back to this after a break, I think the settings above should be a good starting point.

Some tips that might make this easier. I masked the woman in each shot and put the reference and yellow on the same screen (the reference on a track above, shifted over a bit) and tried to match with the Sony Color Corrector.

Here's a link to the matched shots:
https://picasaweb.google.com/lh/photo/fgeWR0K4nojh4qKes4wWf9MTjNZETYmyPJy0liipFm0?feat=directlink

Skin tone in the yellow shot (on the right) looks a bit pink, but trying to correct that too much seemed to throw the shirt color off.
musicvid10 wrote on 2/1/2013, 8:43 PM
Really nice skin tone match. Jason!
And that's the key "memory" color the OP needs to stick with.
As you've seen, once you've got a match there, the hair and shirt are off a little.
I'm surprised you got it as close as you did.
Corsairbuff wrote on 2/1/2013, 8:43 PM
That looks pretty good compaired to what I was getting before. I'll try the settings in the morning. My brain has had a long day and my eyes are tired. Thank-you very much for your help.