Photoshop SIG March 9, 2009

Replacing a Blah Sky Using Apply Image

1. With the image whose sky you want to replace open look at each channel in the Channels palette and pick the one with the most contrast.
2. Drag this channel to the New Channel icon
3. Click on this new Channel and in the Image menu select Apply Image
4. The default is Multiply but change it to Overlay
5. Sometimes this isn't enough so Apply image again and this time choose Multiply
6. Still on the Channel Copy set the Brush to Overlay mode and paint with black on the white in the part of the channel that should be black.
7. Change foreground to white and paint the areas that should be white.
8. Click on the RGB channel and
9. Double click the backgroud to change background to a layer
10. Drag the sky image to the Image area and below the layer containg the sky you would like to replace.
11. Control click the channel copy to load as a selection.
12. With the image layer active Add a layer mask.