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strengthen colours picture taken ' 70 movie

Jun 1, 2011, 07:13 (This post was last modified: Jun 1, 2011 07:18 by Merijn.)
Post: #1
strengthen colours picture taken ' 70 movie
Hello,

I was aked to adjust some pictures that were taken from a movie shot in the 70's. I got some lessons from google and certain gimp related sites but I got the feeling that it can be done better, and since I'm a beginning user with gimp I thought I should ask here.

I've got the best result by decomposing and looking wich is the colour with the best contrast en then enhance that colour wich channel mixer. The downside is that the the mountain on de background gets completely white, is it possible to adjust the picture piece by piece?
Or am I doing something wrong in the first place?

http://www.wifocarr.nl/downloads/211213.jpg this is the original
http://www.wifocarr.nl/downloads/211213bewerkt.jpg and this is my best result
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Jun 1, 2011, 08:27
Post: #2
RE: strengthen colours picture taken ' 70 movie
(Jun 1, 2011 07:13)Merijn Wrote:  Hello,

I was aked to adjust some pictures that were taken from a movie shot in the 70's. I got some lessons from google and certain gimp related sites but I got the feeling that it can be done better, and since I'm a beginning user with gimp I thought I should ask here.

I've got the best result by decomposing and looking wich is the colour with the best contrast en then enhance that colour wich channel mixer. The downside is that the the mountain on de background gets completely white, is it possible to adjust the picture piece by piece?
Or am I doing something wrong in the first place?

http://www.wifocarr.nl/downloads/211213.jpg this is the original
http://www.wifocarr.nl/downloads/211213bewerkt.jpg and this is my best result
Your diagnostic isn't correct, so the cure isn't Smile

Look at the picture histogram (Dockables dialogs/Histogram), and you find that a good deal of the picture is in dark tones. So what you want is lighten the dark parts, without blowing out the mountain in the back but you have to do this uniformly on the picture, selecting an area and doing intensive color work on it leads to very unnatural results.

You have two tools for that: Curves and Levels. They do exactly the same thing it's juts the user interface that changes, complex stuff is better done in Curves while Levels is simpler to use. In your case, use Level, and drag the center handle under the histogram to the left. This handle indicates what level in the original should end up as middle gray in the final image, so by dragging it on the left, you indicate that dark tones
should become lighter. Alternatively you can use the Curves tool and create a curve that's above the diagonal for the dark tones (this one is more or less equivalent to changing the "gamma"):

[attachment=420]

Once you are happy with the general tone, you can use a little "sharpening". The best tool in a standad Gimp install is "Filters/Enhance/Unsharp mask" (which despite its name, is really for sharpening). In the picture below, I used 2.0, 1.0, 20.

[attachment=421]

You may want to investigate plugins to remove some of the noise/grain (to be applied before everything else).

Now answering your questions on
https://Gimp-Forum.net
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Jun 1, 2011, 08:46
Post: #3
RE: strengthen colours picture taken ' 70 movie
Thnx for the fast reply!!!!!
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