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

[Jason Green]

Yes sorry, I was looking too much into colorspace and didn't realise that
it was during the overlay that the colour change was happening. Thanks.
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Re: [FFmpeg-user] White is not pure white in overlay of PNG on JPEG image

[Paul B Mahol]

On 10/9/19, Jason Green  wrote:
> I feel like I'm so close with your help, but the docs around some of these
> commands is not great and I just can't figure it out.
> Could you please post an example of how you use these options in this
> context. I made the image public so you can literally amend the command I
> posted originally and try it yourself. No matter what I do the png text is
> always a bit grey. Here it is again in its simples form.
>
> ffmpeg -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";
> -filter_complex "[0][1]overlay=x=131:y=300" -codec:v mjpeg test_remote.jpg

If you have read overlay documentation you would use format=gbrp option.

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

[Jason Green]

Actually I managed to get it working by specifying format=gbrp in the
overlay filter.

ffmpeg -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";
-filter_complex "[0][1]overlay=x=131:y=300:format=gbrp" -codec:v mjpeg
test_remote.jpg

Thanks for the help

On Wed, 9 Oct 2019 at 17:15, Jason Green 
wrote:

> I feel like I'm so close with your help, but the docs around some of these
> commands is not great and I just can't figure it out.
> Could you please post an example of how you use these options in this
> context. I made the image public so you can literally amend the command I
> posted originally and try it yourself. No matter what I do the png text is
> always a bit grey. Here it is again in its simples form.
>
> ffmpeg -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";
> -filter_complex "[0][1]overlay=x=131:y=300" -codec:v mjpeg test_remote.jpg
>
>
>

-- 
*Jason Green*






*Principal Developer Email: jason.gr...@threadsstyling.com
 Mobile: +44 7462 752 694
<++44+7462+752+694>*
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Re: [FFmpeg-user] White is not pure white in overlay of PNG on JPEG image

[Jason Green]

I feel like I'm so close with your help, but the docs around some of these
commands is not great and I just can't figure it out.
Could you please post an example of how you use these options in this
context. I made the image public so you can literally amend the command I
posted originally and try it yourself. No matter what I do the png text is
always a bit grey. Here it is again in its simples form.

ffmpeg -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";
-filter_complex "[0][1]overlay=x=131:y=300" -codec:v mjpeg test_remote.jpg
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Re: [FFmpeg-user] White is not pure white in overlay of PNG on JPEG image

[Paul B Mahol]

On 10/9/19, Jason Green  wrote:
> 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?
>

colorspace in this context: jpg is yuv ang png is rgb.

>
> On Wed, 9 Oct 2019 at 12:19, Paul B Mahol  wrote:
>
>> On 10/9/19, Jason Green  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.
>>
>> > ___
>> > ffmpeg-user mailing list
>> > ffmpeg-user@ffmpeg.org
>> > https://ffmpeg.org/mailman/listinfo/ffmpeg-user
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>> > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
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>> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
>
>
>
> --
> *Jason Green*
>
>
>
>
>
>
> *Principal Developer Email: jason.gr...@threadsstyling.com
>  Mobile: +44 7462 752 694
> <++44+7462+752+694>*
> [image: Snapchat]  [image:
> Instagram]  [image: LinkedIn]
> 
>
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Re: [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  wrote:

> On 10/9/19, Jason Green  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.
>
> > ___
> > ffmpeg-user mailing list
> > ffmpeg-user@ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
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-- 
*Jason Green*






*Principal Developer Email: jason.gr...@threadsstyling.com
 Mobile: +44 7462 752 694
<++44+7462+752+694>*
[image: Snapchat]  [image:
Instagram]  [image: LinkedIn]


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

[Paul B Mahol]

On 10/9/19, Jason Green  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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