156 Vuquest 3320g User Guide
H - Histogram Stretch
Increases the contrast of the transmitted image. Not available with some image 
formats. 
0H No stretch (default)
1H Histogram stretch
I - Invert Image
Invert image is used to rotate the image around the X or Y axis. 
1ix Invert around the X axis (flips picture upside down)
1iy Invert around the Y axis (flips picture left to right)
Example of Histogram Stretch at 0H: Example of Histogram Stretch at 1H:
Example of image 
with Invert Image set to 
1ix:
Example of image not 
inverted:
Example of image 
with Invert Image set 
to 1iy: