Hue / Staturation Layer Conversion Method

This method is described on Russell Brown's website, among others. I've never found out what this method is called. I'll just call it "hue / saturation layer" method for lack of a better term.

Some prefer the hue layer method because it overcomes the two drawbacks of the channel mixer method: lack of fine control and the inability to hold the brightness steady. Some find the channel mixer easier to predict and control.

Steps in Photoshop
  1. Select Layer > New Adjustment Layer > Hue/Saturation Layer...
  2. Do not make any adjustments to this layer yet. Simply click on OK.
  3. Set the blend mode for this layer to Color.
  4. Create another Hue/Saturation layer and set the saturation slider to -100.
  5. Go back to the first Hue/Saturation layer and adjust the Hue slider.
  6. You can adjust individual colors by using the drop down list. In this example we'll manipulate magenta.
  7. Notice how manipulating the hue for magenta only affects the magenta box. Notice also that the overall brightness of the image hasn't changed.
Let's try this photograph of the Vancouver Public Library again with the hue dialing method.

After creating the two hue/saturation layers as described this is what the photograph looks like:

For this photograph let's turn the sky black and the building light gray. Open the first hue/saturation layer. After playing with the hue slider for a bit you'll find that -140 creates a nice dark shade of gray.

But the sky still isn't quite dark enough. Let's try adjusting blue. Changing the hue doesn't seem to do very much. but changing the saturation to +50 seems to darken the sky further. The same for blue.

Here's the final result:

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