Honeywell Granit 1991iSR Ultra-Rugged Standard-Range Barcode Scanner - Manual (Page 224)

208 Granit XP 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
Example:
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:
Histogram Stretch at 0H: Histogram Stretch at 1H:
Image with Invert
Image set to 1ix: Image not inverted: Image with Invert
Image set to 1iy: