Which is why he recommends not viewing the examples on a phone. Too bright is less noticeable than too dark, so I guess you're lucky it's off in that direction.

Which is why he recommends not viewing the examples on a phone. Too bright is less noticeable than too dark, so I guess you're lucky it's off in that direction. It's also possible that the image file is a PNG with a gAMA chunk, which sometimes gets rendered incorrectly by browsers.