The black and dark colors can be a problem with modern televisions and monitors.
I've experienced it myself when making a picture in photoshop.
On the computer monitor it clearly shows certain portion of the image with a dark/grey tint in full detail.
But when viewing the same picture on this new television the same region is barely visible and mostly black.
Actually had to adjust the picture itself in photoshop to make it compatible with the television.
I could not get the dark region to show up by adjusting the colorsettings of the tv.