[dazmax]

I'm on a Retina Macbook Pro, and the white/black checkerboard square (A in Figure 12) matches the (128,128,128) gray (B), not the lighter one (C).

Looking closer, it seems like my computer is, like, anti-aliasing the image itself. In Digital Color Meter, the white and black pixels are both grays. See screenshot below, the magnified area is from square A in the browser. When I downloaded the image and opened it in Preview it is black and white like it's supposed to be.

Screenshot: https://cl.ly/2T2U2J0A3v31 (If you're on a Mac maybe try opening the image in an image viewer)

Anyone know what's going on? I also can't distinguish between the first few black bars in Figure 2.

[hunter2_]

When I disobey the don't-zoom directive ("These examples will only work if your browser doesn’t do any rescaling on the images below") I see what your screenshot has. Try pressing Cmd+0 (command zero) to reset your browser zoom to Actual Size and then the pattern should match C instead of B.

EDIT: Sorry, the above applies to my non-retina external display that I have hooked up to my retina macbook. When I view the test images on my internal retina display, I do see the issue you describe (pattern matches B). If I press cmd+- (command minus) a few times until I'm at a 50% zoom level, the issue is resolved and the pattern matches C! Makes some sense actually, since showing a normal dpi photo at 50% on a retina makes for a 1:1 pixel mapping :) Showing an image at 100% on a retina makes for a 1:2 pixel mapping (each pixel from the image ends up being 2x2=4 physical pixels), which disobeys the don't-rescale directive.