Reduce to 2 colors only (black+white) based on threshhold (x-raw GRAY8 format)?

Nicolas Dufresne nicolas at
Mon Nov 20 19:39:22 UTC 2017

Le lundi 20 novembre 2017 à 14:23 -0500, Josh Doe a écrit :
> > There is frei0r-filter-threshold0r that can do that, but the
> > element
> > only inputs RGBA, which forces double color conversion. It's a bit
> > inconvenient. I wonder if it's a Frei0r limitation, or GStreamer
> > here.
> It's a frei0r limitation. A while back I made a MATLAB script which
> would turn a MATLAB M-file into a frei0r plugin to be used in
> GStreamer, and found there was no GRAY8 or GRAY16_*. It's a simple
> #define that's needed to add additional color models, though frei0r.h
> hasn't been touched since 2012. 

That's unfortunate. Well, writing a GstVideoFilter element for that is
rather trivial though. I like the use of a double for the threshold.

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