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.

Step One.
Open the color photo that you want to convert to grayscale using the Lightness method.


Step Two.
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 ...

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