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Replacing a Color Channel

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  #11  
Old 06-06-2002, 11:39 AM
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Jakaleena Jakaleena is offline
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If you are aware of any sort of translation lists or anything, I'd really be interested in having that.

Kind of like the PC-Mac version of an English/Spanish dictionary...
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  #12  
Old 06-06-2002, 11:46 AM
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fugitive fugitive is offline
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I've had an idea for a while, bringing PCs to people in Retirement Homes. It seems they spend so much time doing nothing, not using there minds, and I'm sure some of them still have one.
People of a certain age or mind set have had no exposure to puters and don't know what lies in wait in that funny looking box. The graphics instruction Jak mentions would be perfect for these folks, after all, who has more old photos. just an idea, perhaps one could get a grant to empliment such a program. People are living longer and bordom is worse than death, to me at least.
greg
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  #13  
Old 06-06-2002, 11:56 AM
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winwintoo winwintoo is offline
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Hi Jak and Doug - I don't have much to offer in the way of tutorials (I'm still fumbling around) but I will go through the tips and tuts that are already posted and work on a list of "translations".

I'm off to take Grandma for her day at the casino, but I'll work on it when I get back.

Take care,
Margaret
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  #14  
Old 06-06-2002, 12:13 PM
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Jakaleena Jakaleena is offline
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Greg,

That is an EXCELLENT suggestion!

We've got a discussion about that idea going over HERE in the Work/Jobs section.

Maybe, you could post that idea over there and join in with us...
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  #15  
Old 06-06-2002, 01:41 PM
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Doriedee Doriedee is offline
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Another one of those novice questions for you..
This tutorial was very easy to follow, but my question is, how do you determine that you need to replace the channel in the first place... Just cause it looks the worst or is there a rule ??


Thanks
Donna S
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  #16  
Old 06-06-2002, 02:17 PM
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Jakaleena Jakaleena is offline
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I usually look at the channels first thing.

If I see that most (or a lot) of the damage I'm going to try and repair resides mainly in one channel instead of being spread throuought all three of them, then I replace the channel.

A good example is in retouching challenge #3 - lost weekend. If you download that one and look at each channel, the red channel contains a huge amount of damage that isn't apparent in the green and blue ones.

In less than 2 minutes, by replacing the channel and making a curves adjustment, I came up with this difference - a much better starting point for the job...
Attached Images
File Type: jpg lost weekend.jpg (66.8 KB, 91 views)
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  #17  
Old 06-07-2002, 04:40 AM
Stephen M Stephen M is offline
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Some related PDF links of interest:

http://www.ledet.com/margulis/Poetry.pdf

http://www.ledet.com/margulis/Numbers.pdf

Aimed at colour correction - but the mechanics of channel blends/swaps using channel mixer/calculations/apply image are similar.

There is a whole book devoted to these types of Channel Operations (CHOPs) - which I first found in Kai's Power Tips all those years ago...do a search for Photoshop Channel CHOPS if you would like to find out more.

Another eye opener is LAB based retouching for severe restoration - splitting colour from tone can be CRITICAL and LAB does this while RGB/CMYK do not.

http://www.ledet.com/margulis/LABCorrection.pdf

Regards,

Stephen Marsh.
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  #18  
Old 03-13-2003, 12:20 PM
rosieb rosieb is offline
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I can't figure out what I'm doing wrong, but on the picture I'm working on, the blue channel is the problem, too. I thought I could just follow all your directions (which are very clearly written and easy to follow), but there doesn't seem to be any change once I've finished. It still looks as bad as it did before.
What do you think I'm doing wrong?
I really have learned a lot from reading the tuts here, by the way.
Thanks!
Rosie B.
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  #19  
Old 03-14-2003, 06:18 AM
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Jakaleena Jakaleena is offline
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It's really difficult to know why it's not working for you without actually seeing what you're doing. Most of the time, when replacing the channels doesn't work, there's a small part of the procedure that's getting missed.

If you'll post a sample of the image you're working on, I can try switching the channels here and see if I have any sort of problem with it.
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  #20  
Old 06-11-2003, 04:47 PM
EdwardA EdwardA is offline
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Replacing Channel

Hi,

I'm glad I found this place. I have had Katrin's book for several months and this is one of a couple of examples I keep messing up on.

Using PS7 when I move the lighness layer to the blue channel I end up with an Alpha 1 and not a replaced blue channel. I noticed in the example here that (select all ) is added. I used that and when I move the layer I get a red cast onthe photo with an additional lightness layer.

The way I read both examples I should end up with only 3 channels red,green and blue.

Any ideas what I'm doing wrong?

More mess ups to follow.

thanks
Edward A
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