From 3f359a7cb1847900bc87b3498f72c1ee848942a7 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Tue, 18 Jun 2013 21:41:59 -0300 Subject: [PATCH] [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 Acked-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- Documentation/DocBook/media/v4l/pixfmt.xml | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml index 16db350848af..72d72bd67d0a 100644 --- a/Documentation/DocBook/media/v4l/pixfmt.xml +++ b/Documentation/DocBook/media/v4l/pixfmt.xml @@ -391,9 +391,9 @@ clamp (double x) else return r; } -y1 = (255 / 219.0) * (Y1 - 16); -pb = (255 / 224.0) * (Cb - 128); -pr = (255 / 224.0) * (Cr - 128); +y1 = (Y1 - 16) / 219.0; +pb = (Cb - 128) / 224.0; +pr = (Cr - 128) / 224.0; r = 1.0 * y1 + 0 * pb + 1.402 * pr; g = 1.0 * y1 - 0.344 * pb - 0.714 * pr; -- 2.39.5