What does this mean?

[ingyaningya]

I was in a discussion, (it's to long to explain), but someone left me this comment:

"To recreate Kinemacolor you need to start with Kinemacolor i.e. you need to start with a piece of film that was shot through a rotating red-green filter wheel, so that the alternating ‘black and white’ images have the required different tonal values. It is then possible to combine these to create a colour record frame by frame using Photoshop or similar which can take red and green channels to create a (exactly how I’ve no idea – I am no expert in image software). I guess you could take an ordinary piece of black-and-white film (in digital form), extract the red and green channels and create a Kinemacolor composite, but how practically you would achieve this I don’t know"

I have a couple questions
1) How do you extract the red and green channels
2) What is a composite colour picture, and how do you create it?
I really want to try this thing, so how can it be done?

 

[agentmoeller]

Duplicate channels

You can copy a channel and use it in the current image or another image.


Duplicate a channel

If you are duplicating alpha channels between images, the channels must have identical pixel dimensions. You cannot duplicate a channel to a Bitmap‑mode image.

1. In the Channels palette, select the channel to duplicate.
2. Choose Duplicate Channel from the Channels palette menu.
3. Type a name for the duplicate channel.
4. For Document, do one of the following:
   • Choose a destination. Only open images with pixel dimensions identical to the current image are available. To duplicate the channel in the same file, select the channel’s current file.
   • Choose New to copy the channel to a new image, creating a multichannel image containing a single channel. Type a name for the new image.
5. To reverse the selected and masked areas in the duplicate channel, select Invert.