Ffmpeg question (black and white)

[burnix]

Hi community.

I dont know if it's the right place for this question, so admin can move it.

Can someone can give me help to make a pure black and white image from video (not gray scale).

ffmpeg.exe -y -ss 400 -i %1 -vf hue=s=0 -frames:v 1 out-3.jpg make grayscale.

Thanks to the one that can help me.

[Emulgator]

You may want to use an avisynth filter before FFMpeg.
Because you will want to adjust B/W threshold depending on your source.
And maybe you want to use Auto-Contrast before you apply step gradadation.