Copen Blue vs Piedmont

Both from Sherwin-Williams's palette. Hue-wise, Copen Blue belongs to the blue-green family and Piedmont to the green-grey family. They have nearly identical light reflectance values (59 vs 60), so they'll read as similarly Light in most lighting conditions. Both lean cool, so they'll behave similarly in mixed or changing light conditions. At ΔE 1.1, these are close — the kind of difference that matters when choosing between them, but doesn't read strongly in a finished room. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.