01-20-2019, 08:41 AM
Oops, I guess I spoke too soon. 72 dpi fixed the problem for standard-res Mac, but Retina-display MacBook Pro still showed tiny icons. I put different colored dots in the various sizes (2x, 3to2x, etc.) and confirmed it was pulling in the 2x image, then shrinking that to about 25% of its natural size. The solution, it turns out, is in Photoshop, do not use File > Save As > PNG; use File > Export > Quick Export as PNG instead.