Five tips for painless tones shifts
Method 3: Bring Back Some Original Color
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As an alternative to converting a color image entirely to black-and-white, consider desaturating overall color until you have a subtle wash of tone. Using a full-color photo, create a Black & White Adjustment Layer, and move the sliders until you like the conversion. Then reduce the opacity of the Black & White adjustment layer to restore a trace of the image’s original color.