want to capture image with only red channels showing

[Paul]

Yeah just tried i see what you mean, i don't have a specific answer some one may.
You could just print screen the image then save that captured frame i suppose?


You could try

Select the channel you wish to use/select>all/edit>copy/file>new/edit>paste/layer>merge down.

[Paul]

Ok i have been playing around, in the channels section drag the blues and green channels to waste bin and delete, alter colour of red channel via curves to your desired effect, then save as, it will be a PSD file format.