Color to Grayscale

If you want to get much more control over your color-to-grayscale conversions, then you might want to think about using Hue/Saturation. A lot of people will suggest using the Channel Mixer or other techniques, but the problem with most approaches is that they force you to think like Photoshop instead of giving you an intuitive approach. To convert to black and white with Hue/Saturation, create an adjustment layer and then move the Saturation slider all the way to the left (Figures 10.24 and 10.25). Then, to control what happened to the colors in your image, turn the Preview check box off and then on again, and decide which color area needs to be tweaked (areas that used to be yellow might need to be brighter, for example). ...

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