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Subject: qv4l2: fix SMPTE-2084 processing Author: Hans Verkuil <hans.verk...@cisco.com> Date: Wed Jul 26 20:32:42 2017 +0200 A factor of 100 was missing: I forgot to take into account that SMPTE-2084, being an HDR transfer function, maps values to the range of 0-10000 cd/m^2 luminance. Other transfer functions only go to 100 cd/m^2. Signed-off-by: Hans Verkuil <hans.verk...@cisco.com> utils/qv4l2/capture-win-gl.cpp | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=06273a34de574ed2c89e9a655012ce4ee1136f9e diff --git a/utils/qv4l2/capture-win-gl.cpp b/utils/qv4l2/capture-win-gl.cpp index e818a3afa2f8..65100e26f0ee 100644 --- a/utils/qv4l2/capture-win-gl.cpp +++ b/utils/qv4l2/capture-win-gl.cpp @@ -794,9 +794,11 @@ QString CaptureWinGLEngine::codeTransformToLinear() " r = pow(max(r, 0.0), m2);" " g = pow(max(g, 0.0), m2);" " b = pow(max(b, 0.0), m2);" - " r = pow(max(r - c1, 0.0) / (c2 - c3 * r), m1);" - " g = pow(max(g - c1, 0.0) / (c2 - c3 * g), m1);" - " b = pow(max(b - c1, 0.0) / (c2 - c3 * b), m1);"); + // The factor 100 is because SMPTE-2084 maps to 0-10000 cd/m^2 + // whereas other transfer functions map to 0-100 cd/m^2. + " r = pow(max(r - c1, 0.0) / (c2 - c3 * r), m1) * 100.0;" + " g = pow(max(g - c1, 0.0) / (c2 - c3 * g), m1) * 100.0;" + " b = pow(max(b - c1, 0.0) / (c2 - c3 * b), m1) * 100.0;"); case V4L2_XFER_FUNC_NONE: return ""; case V4L2_XFER_FUNC_709: _______________________________________________ linuxtv-commits mailing list linuxtv-commits@linuxtv.org https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
