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Using the Channel Mixer Adjustment Layer

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  #1  
Old 08-02-2009, 07:46 PM
Jessie711 Jessie711 is offline
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Using the Channel Mixer Adjustment Layer

When using the Chanel Mixer adjustment layer are there any guidelines on how much to adjust each Chanel?

One example given in Katrin Eismann’s book restoration and retouching she gives an example of, Red +110 %, Green +140 %, Blue -170 %.

I think I understand how you can increase more than 100% but how do you remove more than 100%. Or am I missing something.

Thanks
Jessie
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Old 08-03-2009, 09:39 PM
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Craig Walters Craig Walters is offline
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Re: Using the Channel Mixer Adjustment Layer

hi jessie and welcome to RP.

if you look at the channel mixer, you'll notice all settings start out at 0 (except the channel you start in and that is at 100). however, the 0 is in the middle of the scale. minus is to the left and plus to the right. 'percent' may be a bit misleading there. think saturation of that color. plus is more saturated of that color and minus, = less saturation of that color. that's all. dont get caught up too much in the terms. it's what's being done that's important.

as for how much to adjust any channel depends on what you're using the channel mixer with. a badly colored image might require quite a bit of change, where a slightly mis-colored image would require only a tiny bit of adjustment. so, it just depends.
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Old 08-04-2009, 11:14 AM
Jessie711 Jessie711 is offline
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Re: Using the Channel Mixer Adjustment Layer

Thanks for the reply Craig it sounds as if I need to do a little experimenting and see what happens.

Jessie
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Old 08-04-2009, 11:33 AM
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Markzebra Markzebra is offline
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Re: Using the Channel Mixer Adjustment Layer

May seem like an obvious point, but look at your CHANNELS while using the channel mixer, to see what percentage is doing. 100% is full light intensity of each channel. 'constant' is a kind of composite luminosity.

Great tool for image analysis,masking, and many other things. Technical point - all RGB hue/saturation changes can be simulated precisely with channel mixes PLUS some. Shifting overall COLOR with channel mixer is powerful but dangerous territory.
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