Messages in this thread | | | Date | Sat, 11 Jan 2014 18:22:57 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH v2 16/28] drm/i2c: tda998x: change the video quantization |
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On Thu, Jan 09, 2014 at 12:05:00PM +0100, Jean-Francois Moine wrote: > This patch changes the video quantization to RGB/YUV.
Strong NAK, this patch is definitely incorrect.
The Cubox (which I assume is the platform you're generating these patches for) produces RGB at it's output, which are the RGB values from the framebuffer. Being a computer-like "IT" source, these RGB values have the full range, from zero to 255, rather than the limited range of 16 to 235.
With limited range, a value of 16 is black and 235 is white. However, the values in the framebuffer will be zero for black and 255 for white.
A VQR value of 1 gives limited range of 16 to 235, whereas zero gives full range. The value of zero is correct here.
-- FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up. Estimation in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad. Estimate before purchase was "up to 13.2Mbit".
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