[media] v4l: Fix colorspace conversion error in sample code
The sample code erroneously scales the y1, pb and pr variables from the [0.0 .. 1.0] and [-0.5 .. 0.5] ranges to [0 .. 255] and [-128 .. 127]. Fix it. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
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@ -391,9 +391,9 @@ clamp (double x)
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else return r;
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}
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y1 = (255 / 219.0) * (Y1 - 16);
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pb = (255 / 224.0) * (Cb - 128);
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pr = (255 / 224.0) * (Cr - 128);
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y1 = (Y1 - 16) / 219.0;
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pb = (Cb - 128) / 224.0;
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pr = (Cr - 128) / 224.0;
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r = 1.0 * y1 + 0 * pb + 1.402 * pr;
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g = 1.0 * y1 - 0.344 * pb - 0.714 * pr;
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