Using the Lightness Channel
This method of converting an RGB image to grayscale lets you isolate just the luminosity in the photo, separating out the color; and by doing so, you often end up with a pretty good grayscale image. However, since this uses the Lightness channel, we also add one little twist that lets you “dial in” a perfect grayscale photo almost every time.
Open the color photo that you want to convert to grayscale using the Lightness method.
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Go under the Image menu, under Mode, and choose Lab Color to convert your RGB photo into Lab Color mode. You won’t see a visual difference between the ...