Honeywell 1900GSR-2 User Manual page 200

H - Histogram Stretch
Increases the contrast of the transmitted image. Not available with some
image formats.
0H No stretch (default)
1H Histogram stretch
Example of Histogram Stretch at 0H:
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 image not
inverted:
8 - 8
Example of Histogram Stretch at 1H:
Example of image
with Invert Image set to
1ix:
Example of image
with Invert Image set
to 1iy: