138 N3680 Decoded Engine User Guide
W - Histogram Ship
A histogram gives a quick picture of the tonal range of an image, or key type. A low-
key image has detail concentrated in the shadows; a high-key image has detail 
concentrated in the highlights; and an average-key image has detail concentrated 
in the midtones. This modifier ships the histogram for an image.
Example:
0W Don’t ship histogram (default)
1W Ship histogram
Image used for histogram: Histogram of image at left: