I am having some trouble deciphering the gray squares (20 to 23) on my Macbeth chart. The numbers correspond to terms like "neutral 8 (.23)".
Is this any relation to how the gray card it specked at 18% gray etc. In other words does any particular patch approximate 18% gray.
My wild guess would be that each increment is roughly a stop or so up from black.
Macbeth Chart Gray Squares
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