[suby]

Not to mention are viewing the colors on different screens, with possibly different tv/monitor modes enabled which will alter colors. I have two monitors where colors can look noticeably different. Unfortunately it's probably not feasible to account for this.

[sillysaurusx]

You're absolutely right, and that's an exciting area: viewing conditions matter!

Well, different monitors aren't really different viewing conditions, but it's a similar idea.

When people can't see colors too well, they turn up the brightness. But that changes the problem entirely.

Even something like whether a window has curtains or not will completely change whether you can perceive a certain "vibrance." Lots of the conversation in parallel replies has probably suffered due to such confusions.