[Development] [Interest] QVideoFrame and YUV question

[Thiago Macieira]

Em sex 14 mar 2014, às 10:06:48, Jason H escreveu:
> http://en.wikipedia.org/wiki/YUV
> 
> 
> "The YPbPr color model used in analog component video and its digital
> version YCbCr used in digital video are more or less derived from it, and
> are sometimes called Y'UV. (CB/PB and CR/PRare deviations from grey on
> blue–yellow and red–cyan axes, whereas U and V are blue–luminance and
> red–luminance differences.) The Y'IQ color space used in the
> analog NTSC television broadcasting system is related to it, although in a
> more complex way."

You're explaining the YUV, YCbCr and YPbPr colourspaces. Yes, those come from 
analog and colour TV. And even if modern LED TVs red, green and blue LEDs, 
they have different colour wavelengths than the RGB colourspace asks for, so a 
conversion is necessary anyway.

I was talking about the packing pixel values of the YUV 4:2:0 scheme -- the 
fact that U and V are located later in the scan line. That came much later.

PS: could you remove the reply-to in your emails?
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center