Oops, forgot to add the statement.
When using the X11 graphics driver, this plugin allows for greater than 1 values to accomodate HDR. The display will stop at -10\% or +110\%, but there is no clipping. By varying the brightness all out-of-range values become visible, even over 110\%. However for Videoscope, you must disable the "smooth" option which always causes
clipping. The color model should be set to RGBA-FLOAT (because you cannot have HDR with integer 8-bit models). This does not work when using X11-OpenGL at this time.