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 Post subject: Cast
PostPosted: Thu May 18, 2017 6:42 am  (#1) 
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I know there must be an easy solution to remove red casts in photos - or any other colour (have only seen red though).
I tried 'turn off red channel' Picture saved the same as it was originally.
So then I tried removing red altogether from the photo which removed red from other areas I would have liked it to remain and the whole photo turned green.
For future reference - what do you do?

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 Post subject: Re: Cast
PostPosted: Thu May 18, 2017 7:59 am  (#2) 
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did you try viewtopic.php?f=9&t=15079&hilit=white+balance ?

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 Post subject: Re: Cast
PostPosted: Thu May 18, 2017 8:10 am  (#3) 
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Thanks for replying dinasset.
Doesn't that filter affect the whole picture? No?
I was just talking about a red cast over an area. Like a strip down the middle.

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 Post subject: Re: Cast
PostPosted: Thu May 18, 2017 9:55 am  (#4) 
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Do you mean something that's described here?

http://retouchpro.com/tutorials/?m=show&id=304

I don't know a gimp tutorial. There is no quick filter for this (not yet). It is a lot of work. Succes.


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 Post subject: Re: Cast
PostPosted: Thu May 18, 2017 10:27 am  (#5) 
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I trick I accidentally concocted a few years back. Dup for a total of three layers, set top layer to Value and center layer to screen. This reduces red cast. :)

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 Post subject: Re: Cast
PostPosted: Thu May 18, 2017 10:52 am  (#6) 
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sallyanne wrote:
Thanks for replying dinasset.
Doesn't that filter affect the whole picture? No?
I was just talking about a red cast over an area. Like a strip down the middle.

nonetheless it's worth a try, then you may judge the result

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 Post subject: Re: Cast
PostPosted: Thu May 18, 2017 11:01 am  (#7) 
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Sallyanne, as long as Gimpchat does not upload images, you can use Gimplearn to post there the image with the red cast and the result of using my filter (with your comments), or -if you do not want to try yourself- just post the source image and someone can try (myself using my filter, other people using other tools and/or a tested procedure, IDK)

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 Post subject: Re: Cast
PostPosted: Thu May 18, 2017 7:01 pm  (#8) 
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You can always make a selection, then use Hue-Saturation filter..

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 Post subject: Re: Cast
PostPosted: Fri May 19, 2017 3:16 am  (#9) 
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This is the photo I am talking about
Imageexample by sallyanne,

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 Post subject: Re: Cast
PostPosted: Fri May 19, 2017 3:59 am  (#10) 
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I see.
Really difficult, outside my possibilities because the area where the red cast appears is also feathered.
Done some tries, but no outcome worth to be posted, sorry.

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