Do you mean Color to Grayscale, or you mean color to black/white 1 bit?
To turn a color picture from color to grayscale, go to menu Image/Mode/Grayscale.
Inconvinience is that some colors turn to same gray value.
The best way is Image/Adjust/Channel Mixer.
Enable Monochrome option, and mix channels to taste. Convert to Grayscale.
Regards
Michael Cervantes
MC Design Studio
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