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Question regarding colour correction

Daniel Salazar
Hi all, I moved recently from Aperture to C1, I've already take some lessons, and I think that I understand how the software works in the general aspects, however the small ones, are still sometimes unknown to me.
I am not confronted to a situation regarding a picture that in some parts have a green cast due to the reflection of the vegetation, and I would like to know, what is the best way to correct the colour cast?, I was trying to do it using general colour adjustments but it not work (I might have done it in the incorrect was), and also tried using the local adjustments selecting the green colour and moving the hue slider, also could not said, it was correct. Any ideas?
Cheers,
Daniel
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Comments

5 comments

Date Votes
  • Ian Wilson
    Moderator
    Top Commenter
    I find that getting the colour right when the light is affected by green vegetation (for instance among trees) can be one of the hardest things. My current approach to that is to (1) try to set the colour temperature about right first (but not worry if it still looks a bit green) and then (2) move the tint slider to the right (that is to a positive value, away from green towards magenta). If you are fortunate enough to have something in the same lighting that is of a fairly neutral colour, and use it to pick a white balance from, then you'll probably see the tint gets set some way into the positive end of the scale.

    With C1 version 8 you now have the extra possibility of applying white balance as a local adjustment, so you could apply a tint correction to just some parts of the image if not all of it is equally affected by the green cast from the vegetation.

    Others may have more suggestions.

    Ian
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  • Ian Wilson
    Moderator
    Top Commenter
    Prompted by this query I have been having a go at a picture I took yesterday. It was taken in the space underneath a road flyover. The roof, or underside of the road, looked quite green because of the green light reflected from grass and trees in the surroundings. In the screen shot, the variant on the left shows the image after making adjustments such as exposure, WB, crop, levels and so on. In the variant on the right, I have also tried to do something about the green colour of the roof. To do that (1) I made an adjustment layer called "Ceiling green cast" using the brush to cover the roof and the near pillars. (2) I moved the tint to the right to make it less green and more magenta. As it made it look a bit too warm I also reduced the WB temperature for the selection a bit. (3) As parts of the roof and the tops of the pillars still looked a bit greenish, I then used the advanced tab of the colour editor, picked a green colour from the top of a pillar, and reduced the saturation of that colour. I think it works reasonably well.

    (Also I didn't quite like the colour of the ground - it was a bit too magenta for my liking, so I made another layer for the ground and reduced the tint slider for that.)

    https://dl.dropboxusercontent.com/u/30547544/Underpass.png

    Ian
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  • Paul Steunebrink
    You can also use a channel correction in Levels or Curve tool. I have used it in several occasions like landscape (green cast).

    I wrote a blog on this last year for the Image Professor blogs based on CO7. I reposted it on my own site and reworked it to match CO8:
    http://imagealchemist.net/the-secret-ye ... ting-tool/
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  • Ian Wilson
    Moderator
    Top Commenter
    [quote="Paul_Steunebrink" wrote:
    You can also use a channel correction in Levels or Curve tool. I have used it in several occasions like landscape (green cast).

    I wrote a blog on this last year for the Image Professor blogs based on CO7. I reposted it on my own site and reworked it to match CO8:
    http://imagealchemist.net/the-secret-ye ... ting-tool/

    Interesting blog, Paul. Thanks.

    Ian
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  • Daniel Salazar
    hi Ian and Paul, thank you, I will try it. I already tried creating a layer and and reducing the tint. This worked pretty well and was able to change the RGB values to be closer to the correct colour values, however, until now I cannot make radical colour changes using the colour wheel.
    I will continue trying some of Paul's tips.
    Cheers,
    Daniel
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