HP 815MFP - Manual (Page 66)

60 hp designjet 815mfp & scanner 4200
tell me about scanner operating modes
The scanner can work in the following operating modes:
• RGB mode
• graytone mode
• B/W modes
• 2D-sharpening, 2D-softening, and 2D-blur
rgb mode
Full 24-bit true color mode for 16.8 million colors. Use the true color
mode for precise reproduction of all color shades. This mode
creates large files, especially when scanning large formats.
graytone mode
In Graytone mode, the actual gray level of each pixel is scanned;
256 levels are recognized, corresponding to 1 byte (8 bits) per
pixel. This results in graytone files that are 8 times larger than
uncompressed files scanned in Line mode at the same resolution; for
example, an E-Size drawing scanned in graytone mode at 300 dpi
has a file size of 150 MByte, compared with typically 0.4 to
1.0 MByte for a compressed file in Line mode.
b/w modes
In these modes, the scanner outputs each scanned pixel as a single
bit, either black (1) or white (0), depending on whether its gray
level is below or above the threshold.
Both fixed level and 2D-Adaptive thresholding are supported.
The copy modes incorporate Dual 2D-Adaptive processing with
different combinations of ADL+ Error Diffusion Halftoning, 2D-
Background suppression, 2D-Auto edge enhancement and 2D-
Adaptive thresholding. The copy modes are ideal scanning wide
format documents that are intended for re-printing. The ADL+ Error
Diffusion Halftoning supports visibility of graytones in printed output