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The Photoshop Phanatic: Photoshop BasicsPart 3: Converting a Color Image to Black & White
In this installment of Photoshop Basics, we will explore various color to black & white conversion techniques. These are not by all means the only ways to convert color to black & white, but just a few of the most common methods. So, open up your copy of Photoshop and follow along.
Technique 1 (Grayscale Mode)
With this technique Photoshop will convert all colors to black, white, and shades of gray.
Technique 2 (Desaturate)
The Desaturate command converts color to black & white in the same color mode. For example, it assigns equal red, green, and blue values to each pixel in an RGB image to make it appear grayscale. In documents with more than 1 layer, Desaturate will only convert the currently selected layer.
Technique 3 (Hue/Saturation)
Last, but not least, is the Hue/Saturation technique. This is my personal favorite since you can create some interesting effects with this one.
As they say, variety is the spice of life. Experiment with these techniques and see which you prefer.