Check your "Options" menu, then "Graphic Settings", and clear the tick box for "Post Process Filters". That setting cranks up the saturation and adds a "graininess" to the image, trying to make the screen look like an old movie. If that's not ticked, then perhaps move the "Gamma" slider just a pinch - not too much now - but just a pinch to the right. You might notice pixelation in the shadows if you go too far. Even just a half of the width of the slider is probably too much.
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