Multichannel images

- [Instructor] In this movie, we're going to make…a multichannel image from a color image…and what we need to do before we turn it into…a duotone, a tri-tone, or a quad-tone,…is actually turn it into a gray scale image.…Now, that doesn't mean going up…to the image menu and choosing mode…and gray scale straight away because that is like…we're using a really ginormous mallet to crack a walnut.…What you need is good gray scale input information…before you actually convert to gray scale.…

Another method that is used is de-saturation.…Shift command U, shift control U…and that can sometimes work but it is still very crude.…Best to have some control over it.…Now, there are three ways which you could approach this.…The first method is to go to image,…and adjustments, and black and white to do that.…You could also apply it as an…adjustment layer on top of your…layer, here, with black and white,…but my favorite way is to use the camera raw filter…because you've got so much more…granular control over what you're doing.…

If I go up to the filter menu and come down…