Honeywell Granit XP 199 i Series User Manual page 230

H - Histogram Stretch
Increases the contrast of the transmitted image. Not available with some image
formats.
Example:
I - Invert Image
Invert image is used to rotate the image around the X or Y axis.
Example:
212
0H No stretch (default)
1H Histogram stretch
Histogram Stretch at 0H:
1ix Invert around the X axis (flips picture upside down)
1iy Invert around the Y axis (flips picture left to right)
Image not inverted:
Histogram Stretch at 1H:
Image with Invert
Image set to 1ix:
Image with Invert
Image set to 1iy:
Granit XP User Guide