The advantage is that you can easily switch the colours used to create new unique image recipes. Start by duplicating the start image layer and then desaturate the copied layer (Image>Adjustments>Desaturate). Go to Select>Color Range, and in the Color Range dialog use the Select drop-down to choose the Highlights. Now save this selection (Select>Save Selection) and name the selection ‘Highlights’. When done, be sure to deselect to remove the marching ants (Ctrl/Cmd+D). Go back into the Color Range dialog and create/save two more selections – one for the midtones and one for the shadows. Be sure to deselect (Ctrl/Cmd+D) after saving each selection, otherwise you may get a warning message indicating no pixels are selected. When you’re finished, click on the Channels palette. You should see your three selections as alpha channels. Select the Highlights channel and blur the channel (Filter>Blur>Gaussian Blur). Use a setting that matches your image resolution.
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