Ps3 media library not updating
The extra bits (color depth) available in the HDMI 1.3 Deep Color mode are used to preserve the precision of calculation.
I like the subtitles as low on the screen as possible.
In an 8-bit system the fractions are truncated, but in the Deep Color mode the fractions are preserved so the data delivered to the display is more accurate.
Note Some AVRs and displays give only lip service to 12 bit 4:2:2 or Deep Color 4:4:4 -- accepting the format as input but then immediately stripping off some or all of the low order bits prior to actually using that video stream.
Sometimes subtitles appear high on the display (for example, so as not to obscure onscreen credits) and it would be nice if these were shifted down when lower titles were shifted up, but the player does not currently do that.
Note Subtitle shifting is a feature the Constant Image Height users like.
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It is conceivable that Deep Color might reduce banding in some images, although I never see banding in real films (as opposed to cheaply produced logos and fx screens).