Honeywell XENON 1902 - Manual (Page 210)

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C - Compensation
Flattens the image to account for variations in illumination across the
image.
0C Compensation disabled (default)
1C Compensation enabled
D - Pixel Depth
Indicates the number of bits per pixel in the transmitted image (KIM or BMP
format only).
8D 8 bits per pixel, grayscale image (default)
1D 1 bit per pixel, black and white image
Example of Compensation at 0C: Example of Compensation at 1C: