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Export separate video channels R, G, B, etc

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Jim Arco
Export separate video channels R, G, B, etc
on Jun 30, 2013 at 2:53:14 pm

I have been working with some video in Photoshop CS5.5 and I'd like to be able to export/save one channel of the video file. So, for instance, I'd like video (or image sequence) of just the red channel.

Calculations or Apply Image will allow me to modify ONE frame. How do I change all frames or just export a red channel?


Jim


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Bill Stephan
Re: Export separate video channels R, G, B, etc
on Jul 1, 2013 at 4:41:23 pm

I never tried this, but what happens if you turn-off the green & blue channels and then export?

Bill Stephan
Senior Editor/DVD Author
USA Studios
New York City


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Jim Arco
Re: Export separate video channels R, G, B, etc
on Jul 2, 2013 at 2:52:16 am

Thanks for the response, but the world of Photoshop is not that easy. Turning on/off channels does not impact the output.

Jim


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Darby Edelen
Re: Export separate video channels R, G, B, etc
on Jul 10, 2013 at 2:00:02 pm

Multiply the video by a 100% red color layer to get only the red channel.

You could also do that with layer styles.

Darby Edelen


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Darby Edelen
Re: Export separate video channels R, G, B, etc
on Jul 12, 2013 at 3:22:40 pm

Also there's the Channel Mixer adjustment layer. That would give you even more flexibility.

Darby Edelen


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Jim Arco
Re: Export separate video channels R, G, B, etc
on Jul 15, 2013 at 3:25:04 am

Thanks, Darby for several solutions. I guess I wasn't specific enough. I really want to be able to save an image sequence of a given channel in any color space... so maybe a sequence of the K channel from CMYK, for instance.


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Darby Edelen
Re: Export separate video channels R, G, B, etc
on Jul 19, 2013 at 5:00:17 am

[Jim Arco] " Thanks, Darby for several solutions. I guess I wasn't specific enough. I really want to be able to save an image sequence of a given channel in any color space... so maybe a sequence of the K channel from CMYK, for instance."

Did you try the Channel Mixer? That should work in CMYK.

Alternatively you can fill a layer with 100% K and set it to the Linear Dodge (Add) mode.

Darby Edelen


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Jim Arco
Re: Export separate video channels R, G, B, etc
on Jul 19, 2013 at 1:18:01 pm

Channel Mixer seems to only work for the current frame and is grayed out for smart objects.

But the "fill layer with 100% K set to the Linear Dodge" seems to work for CMYK.

How about a brainstorm for Lab color?


Jim


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Darby Edelen
Re: Export separate video channels R, G, B, etc
on Jul 19, 2013 at 8:04:48 pm

[Jim Arco] "Channel Mixer seems to only work for the current frame and is grayed out for smart objects."

Channel Mixer Adjustment Layer?

Darby Edelen


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Darby Edelen
Re: Export separate video channels R, G, B, etc
on Jul 19, 2013 at 8:07:19 pm

[Jim Arco] "How about a brainstorm for Lab color?"

Levels Adjustment Layer, set the Output White to '0' for any channel you don't need. Come to think of it that should work for any of the situations you've mentioned thus far.

Darby Edelen


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Jim Arco
ALLLRIGHT !!! was Re: Export separate video channels R, G, B, etc
on Jul 20, 2013 at 3:01:38 pm

Darby,

A levels adjustment layer with both output boxes set to 126 actually provides the solution in every scenario I've tried. Thanks for all your help.

Jim

BTW - I am working with some client video where they need contrast-enhancement using channels from different color spaces. Very interesting concept that I've used for stills, but never tried with video.


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Darby Edelen
Re: ALLLRIGHT !!! was Re: Export separate video channels R, G, B, etc
on Jul 20, 2013 at 5:49:07 pm

I'm glad you found something that works for you. I'm surprised that 126 does what you want as it's sort of a random number :) Also I wouldn't expect that to turn any channels 'off'

I'd be curious to hear more about the process you're using.

Darby Edelen


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Jim Arco
Re: ALLLRIGHT !!! was Re: Export separate video channels R, G, B, etc
on Jul 21, 2013 at 1:56:58 am

Fat-fingered... actually 128, half of 256. I found it was needed to eliminate any luminance component.

the Background: Several years ago, I attended a seminar by Dan Margulis where he taught a process he called picture postcard workflow, centered around using Photoshop to greatly improve any still photo. Dan is one of the few pre-press experts, wrote the Professional Photoshop series of books and also a weighty tome on Lab color, considered by many to be the definitive work on Lab. Since that time, I've attended Dan's other seminars and worked my way through his training series on the NAPP website.

One of the techniques he developed uses blending of channels from other color spaces to improve photo contrast and color. Using that technique, I was able to work minor miracles on a still-frame from footage provided for a current job. I could script the process to work through a frame at a time in Photoshop, but there is a lot of footage. So, right now I have been experimenting with ways to extend the tools to use with video. If I have any significant breakthroughs, I'll provide updates here on the COW.

Jim
Jim


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Darby Edelen
Re: ALLLRIGHT !!! was Re: Export separate video channels R, G, B, etc
on Jul 21, 2013 at 6:16:43 pm

Interesting. Well if you'd like any help finding alternate methods to achieve a similar result feel free to post back. I'd like to see the miraculous still frame before/after :)

Darby Edelen


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