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We've just learned one of many techniques that we can use to convert a color image to black-and-white.

Another quick, non-destructive method is to apply a Hue/Saturation adjustment layer to the image, and set the Saturation level to -100, as shown in the example below.

Adding a Hue/Saturation adjustment layer

Even simpler still is to select Image > Mode > Grayscale to convert your color image into a grayscale image. However, this method does permanently alter your image, so you may want to make a backup first.

The figure below shows three different grayscale versions of the same image. If your aim is to create a sophisticated black-and-white masterpiece, using the Channel Mixer will give you more control over the final image, allow you to preserve detail, and provide you with richer blacks. On the other hand, if all you're after is a simple grayscale image, the other two methods will suffice.

Channel Mixer Hue/Saturation Grayscale

Channel Mixer Hue/Saturation Grayscale

Comparing methods
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