Can we turn this question around? Other than white on black and black
on white (presumably these are safe) what are the best colour
combinations or more generally what should I look for in selecting
colours using Apple's various colour-adjustment (RGB, CMYK, etc.)
when choosing colours so that text in small fonts are readable
(especially for podcasting)?
Many thanks!!
Wayne
On 18-Jan-06, at 9:05 PM, Kevin Marks wrote:
On Jan 18, 2006, at 5:29 PM, Dieder Bylsma wrote:
This is a weird question. Why does MPEG H.264 treat the color red
the way it does? I noticed this in U2's beautiful day video, it's
even more pronounced in the Kim Possible episodes. The red shows
heavy pixilation more than other colors.
Pure red seems to be the bête-noire of most codecs out there
actually, not just H264. I've seen the typical pixelation on
almost any codec of recent vintage when it comes to highly
saturated reds. The only way around it is to bump up the bandwidth
for that section, but even still... MPEG-2, MPEG-1, H264,
Sorenson, etc. all have issues.
This is due to chroma subsampling. The colour has lower resolution
than the luminance.
As Y = .11 B + .3 R +.59 G, you get more pixellation in red and
blue than green. Very bright blues are rarer than bright reds, so
you see it more on reds.
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