1      Adjustment layers - 2 x channel mixer

This part is the same as the basic channel mixer technique, in that you must tick the monochrome box then adjust the three channels to create the desired effect. However as you will be working on only one part of the image at a time, adjust the settings so that only that part of the image looks right. In this example I wish to adjust the sky first so I have adjusted the three channels to get the best effect for the sky, I have ignored the effect on the rest of the image.

Each adjustment layer comes with its own mask which by default is filled with white, this makes any adjustment visible. However if you fill the mask with black ( 'Edit' > 'Fill' ) the effect of the channel mixer disappears and the image once again appears as a colour image.

You then simply paint over the mask with white to show the channel mixer effect. To start with leave the opacity of the paint brush as 100%, but as you experiment more you can change the opacity to a lower percentage for more control.

Another adjustment layer > 'channel mixer' is created for each part of the image, in this example one for the land and sea although you could use separate adjustment layers for different parts such as the sea, the land, the beach, the cottage. Remember to fill the layer with black and then paint white on the areas you want to adjust.

There is no limit to the amount of adjustment layers you can create so that you can have different mixer channels effects on various parts of the image. This is a similar method to 'dodging and burning' in the conventional darkroom only you have the ultimate control on each area by simply painting black or white on part of the image.

The ultimate technique and getting the print ready for printing,