Re: [Gimp-user] white balance question

[Ofnuts <ofnuts gmx com>]

On 18/03/15 21:25, Boisdesdames wrote:
> Hi,
>
> I have a question about the automatic white balance tool applied to a 
> portion of a picture (in my case, scans of negative pictures). The 
> tool "Colors -> Auto -> White Balance" gives good results most of the 
> time. But when the image has strong contrast (for example winter 
> pictures in the snow), the result is not that good.
> If I select a portion of the picture (rectangular selection tool for 
> example) and apply the automatic white balance, the result is better 
> but is only applied to the selected region of the picture. Is there a 
> way to apply these settings to the whole picture ?

If you are scanning negatives, there are more accurate techniques. This 
one works quite well:

http://old.macedition.com/feat/film/feat_film_20030626.php

In Gimp you have to use Levels instead of Curves to get the color 
pickers. And you can save the settings to reuse them on other scans from 
the same film.