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Applying Gimp Auto White Balance to Video NLE

Feb 3, 2012, 23:27
Post: #1
Applying Gimp Auto White Balance to Video NLE
I find that if I have some video that has poor colour, if I grab a still from it and bring it into GIMP, GIMP does a good job on correcting it.

Now, I'd like to know what colour correction settings were applied by that filter so that I can go back to my video editing package and apply similar colour corrections across the entire video clip, not just the still.

Any idea how to find this out?
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Feb 3, 2012, 23:38
Post: #2
RE: Applying Gimp Auto White Balance to Video NLE
Insert a small gray chart somewhere in the picture and see into what it gets changed.

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Feb 3, 2012, 23:47
Post: #3
RE: Applying Gimp Auto White Balance to Video NLE
(Feb 3, 2012 23:38)ofnuts Wrote:  Insert a small gray chart somewhere in the picture and see into what it gets changed.

Interesting idea, then the difference in the RGB values can be applied, not sure if my video editing package will allow that kind of adjustment, but worth a shot. Thanks
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Feb 6, 2012, 10:25 (This post was last modified: Feb 6, 2012 10:57 by rich2005.)
Post: #4
RE: Applying Gimp Auto White Balance to Video NLE
Quote: Interesting idea, then the difference in the RGB values can be applied, not sure if my video editing package will allow that kind of adjustment, but worth a shot. Thanks

Interesting, as you say, all depends on your video editor.

A test using my preferred mpeg editor, Womble.

Some screen shots http://i.imgur.com/NMJZv.jpg

The first in Gimp is
left side original, right side auto white balance and the center is a stab at recreating that using the colour controls.

The second is applying those values in Womble, making allowances for different value scales. (ie 100 vs 200 for RGB)

Result is horrible. I did render this and try on a TV. Still Horrible.

I would say, if possible, dive straight into your video editor and do the corrections there.

edit: Just had another try.
Ignoring the different RGB scale and putting the Gimp values in gave a reasonable result.
For the brightnes/contrast, even though the Womble scale is the same as Gimp, I had to reduce the values by 50%, still looks a little washed-out but close to the Gimp Auto-white.
FWIW my advice. Do a few small trials and see what works.

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