How do you extract channels from a black and white photo?

[ingyaningya]

Here is what I mean...


One image has a red record, one image has a green record.
How can I extract the channels of a B&W image (meaning it was never in colour).

 

[ibclare]

I'd like to help but not sure what you mean by extract. B&W photos have red, green,and blue channels just as color photos do.

 

[ingyaningya]

I'd like to help but not sure what you mean by extract. B&W photos have red, green,and blue channels just as color photos do.

Well, then how do you extract the channels?

 

[ingyaningya]

I mean, how do you set the black and white record to a red or green channel, and make it a black and white picture with a red or green record?

 

[SeniorS]

My head hurts

You have old BW photo which simulate color image? Meaning each frame is for diferent color (R,G,B).

Anyway, if you have in PS BW image and have converted it to RGB (otherwise there isn't any red or blue channel in BW image) but you want take only one color channel to be separate image.
1. Open Channel panel.
2. Click on color you want to extract.
3. Select All (CTRL+A).
4. Copy selection (CTRL+C).
5. Create new document (CTRL+N).
It have to be greyscale by default and copied document size, if it isn't so then you have done something wrong (and selection haven't copied) and you have to repeat and check previous steps.
6. Paste copied information (CTRL+V).
7. Flatten image.

Now you have one channel information in separate document.

 

[ibclare]

My head hurts

You have old BW photo which simulate color image? Meaning each frame is for diferent color (R,G,B).

Yes, I don't think about that as I always make mine RGB. Yes, if that's what you want, Senior has given you the exact steps.