Convert luminosity Mat into image

@alberto2000 wrote:

Hi all, so I have a http server now running (using https://github.com/yhirose/cpp-httplib) and I can return strings on request.

The images I have are Mat’s with only the luminosity plane:

// camera is a VideoGrabber
cv::Mat frame = ofxCv::toCv(camera.getPixels().getPlane(0));

How can I re-convert that luminosity plane into a format which I can send as raw bytes for interpretation as a jpeg client-side?

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