[FFmpeg-devel] [RFC] cinedec: report white balance gain coefficients using metadata
pross at xvid.org
Thu Nov 13 07:37:29 CET 2014
On Thu, Nov 13, 2014 at 12:58:07AM +0100, Michael Niedermayer wrote:
> On Sun, Nov 09, 2014 at 12:05:41PM +1100, Peter Ross wrote:
> > For cehoyos:
> > The PhantomCINE file format stores unprocessed sensor data from the
> > camera CFA, and reports image processing coefficients in the file header.
> > To make meaningful use of this file format with FFmpeg, additional filtering
> > is required.
> > R/B gain:
> > -vf 'lutrgb=r=WBRGAIN*val:b=WBBGAIN_*val'
> > (replace WBxGAIN with value reported by cinedec)
> > _or_ for automatic adjustment
> > -vf 'histeq'
> > There is still a need to compensate for gamma, but I do not know how to
> > convert the gamma value reported in the cinedec file to lutyuv/eq2 value.
> > (Also, the gain and gamma is intended to be applied in bayer colorspace.
> > FFmpeg does have any bayer colorspace filters yet so they are applied post
> > RGB conversion.)
> > [You may reuse the above text in FFmpeg wiki/documentation if neccessary.]
> > ---
> > libavformat/cinedec.c | 16 +++++++++++++++-
> > 1 file changed, 15 insertions(+), 1 deletion(-)
> it says RFC in the subject, should i apply this ?
> it looks good to me ...
Please apply this.
The other cinedec patch, concerning gamma adjustment, is incorrect. Do not apply that one. Thanks.
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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