Why is MP4 black background gray in Internet Explorer 11? I exported a Flash movie with a black background to MOV, and converted the MOV to mp4 (H.264). In Quicktime player, the background of the MOV and mp4 are black. In native players in Firefox and  Chrome (desktop) and Safari and Chrome (ipad), the background of the mp4 is black. In IE11... it's dark gray. 

The actual gray is rgb 16 16 16, hex #101010. 
Any ideas?
The solution was to turn off IE-11's "hardware acceleration" feature which (says here) "lets Internet Explorer move all graphics and text rendering from the CPU to the Graphics Processing Unit (GPU)".

I disabled that under Tools -> Internet Options-> Advanced by selecting "Use software rendering instead of GPU rendering".  It's pictured here

Then, after obligatory re-start (of IE), all the grays were black and colors bright in IE-11. 
Now, how I communicate this knowledge to IE users viewing my washed-out videos is a tough new question.