Working in Black and White

2. Make sure the top layer in the Layers palette is selected; in this case it is Fog. Click the Create New Fill Or Adjustment Layer button at the bottom of the Layers palette to apply a Channel Mixer adjustment layer.

3. Check Monochrome at the bottom of the Channel Mixer dialog box. Drag the Red channel slider to +100%, Green to +60%, and Blue to -60% (see Figure 8.36). This combination subtracts the blue component from the other two channels. Furthermore, notice that the sum of all three channels is exactly 100%.

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