@mark_m

I have made some test and a patch to test it. The best solution, with the least loss of definition, is:

Video input > FFGLPanSpinZoom  >  projector

scaling-test.izz

So it means, the best way ist to change the zoom factor in the FFGLPanSpinZoom actor.

Best regards

Jean-François

@jaio

If you can find a suitable cube LUT, for converting rec 2020 to rec 709, you could use my 'color grading' shader (TROIKATRONIX : ISADORA - DX – PY – Cube2LUT – ColorGrading).

This should allow you to convert the color, but will not be as true to source as making the conversion in something like Davinci Resolve (my recommended option).