Ideally, each person should probably characterize their display by eye (instead of a hardware device; and for this to work properly we’d need a better user interface than the existing ones), separately for each context it will be looked at in (i.e. a laptop would need several profiles for various lighting conditions).<p>But we can actually get pretty good results for most people, most of the time, by sticking to industry standards. If a display can get the chromaticity of its primaries close to the sRGB spec and bright enough for the context, and content authors design for sRGB, then most people (minus the substantial percentage who have color vision deficiencies) will see something reasonably close to what the content author intended.<p>If the display doesn’t match the spec (like the iPad mini retina display which trades color fidelity for power efficiency), then it would be nice if software would compensate a bit. Unfortunately, mobile operating systems and software don’t ever bother with color management, because it was too computationally expensive for the first 2 generations of iPhones. It’s sad that this is still true for iOS, considering how Apple pioneered color management software in the 90s.<p>For folks with color vision deficiencies, we could probably do better than current displays, but there are several types of color vision deficiencies so it’s going to be pretty hard to satisfy everyone.