[FFmpeg-user] White is not pure white in overlay of PNG on JPEG image

[Jason Green]

Ok so I get that png doesn't have a colourspace, so do I need to specify a
colorspace for the input? Plus I need to specify the output I am guessing.
I have tried outputting with various colorspace and color_range values but
I'm having no luck. Do I need to just keep experimenting with these values?


On Wed, 9 Oct 2019 at 12:19, Paul B Mahol <onemda at gmail.com> wrote:

> On 10/9/19, Jason Green <jason.green at threadsstyling.com> wrote:
> > I'm sorry to bother you all with this but I have been unable to resolve
> the
> > issue with my own research (which is really rare for me :) ).
> >
> > I am trying to overlay pngs of text that have been generated by another
> > source onto jpg photos. I have simplified the command down to it's
> simplest
> > example and I am using public images so you can even try the command
> > yourself.
> >
> > ffmpeg -y -i "
> > https://asset-info-examples.s3-eu-west-1.amazonaws.com/white-text-bg.jpg
> "
> > -i "
> https://asset-info-examples.s3-eu-west-1.amazonaws.com/white-text.png"
> > -movflags faststart -filter_complex "[0][1]overlay=x=131:y=300" -q:v 6 -f
> > image2 -codec:v mjpeg test_remote.jpg
> >
> > The white text png has perfectly white pixels in the original, but in the
> > final they are slightly grey. I have tried various options using format
> but
> > I can't manage to get it to work.
> >
> > Any suggestions would be appreciated.
>
> Avoid implicit colorspace conversion, and do it explicitly.
>
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*Jason Green*






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