I am having a nightmare with a whole load of exports (15 of them!!) where the colours looks great in premiere but are all washed out once exported (Settings are 50mbps .h264's wrapped as a .mp4) I have spent all afternoon researching what the issue might be and i've come to the conclusion that its likely to be a gamma shift problem. I can't find any straightforward solutions to this though so any help would be massively appreciated! The top image below is a screen grab from in premiere with the correct colours and the bottom one is taken from the .h264 in quicktime player.
Thanks in advance
Matt