I noticed, that the videos i captured are displayed as if they were compressed in a lossy way.
Example from the game Strike Commader:

The first image is a screenshot from the player MPlayer, you can see that the red is kinda washed out.
The second is a screenshot from the same file, taken from VirtualDub, which seems to display everything correct.
The third is a screenshot directly taken with DOSBos as reference.

I noticed this effect on other players, too, in linux and windows.
Does anyone have an idea how this could be and maybe how to fix it?