They are usually represented with red, green, and blue channels.

She flicked to the red channel just for a bit of peace.

The boat drifted gently in dead quiet past a bobbing red channel buoy.

For instance, an image from a standard digital camera will have a red, green and blue channel.

If you have goods to declare you must go through the red channel or use the red-point phone.

If you can't see a red channel, use the red point telephone in the customs area.

The nose was a bridge of raw gristle above two red flaring channels.

To do this you should use the red channel or the red-point phone.

The resulting image was 512 by 480 by 24 (8 bits for red, green and blue channels) which took 2 minutes to render.