Epson ES-800C, Руководство пользователя

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To enlarge or reduce the image size, use the scanner’s size
function through your software. In your application software,
perform only fine adjustments. Avoid changing the image size
in your application especially if the image is scanned using
halftoning, because the image quality deteriorates. The default
size value is 100%.
Data format
The data format specifies the number of bits used to represent
the tone of a pixel. The data format can be set in the range of
1 bit to 8 bits per pixel per color.
As the value increases, more tones and colors can be captured
in the scanned image. In monochrome, 1 bit/pixel (bi-level
data) can represent only two levels of tones, black (0) or white
(1). With 2 bits/pixel (quad-level data), four levels of tones can
be represented by the binary values of 00, 01,10 and 11. Using
8 bits/pixel corresponds to 256 shades of gray, producing near
photographic quality results.
In color, the data format defines tones for each of the three
primary colors of green, red, and blue. One bit/pixel/color can
represent eight colors (2 x 2 x 2), and 2 bits/pixel/color can
represent 64 colors (4 x 4 x 4). Eight bits/pixel/color (total
24 bits for a pixel) can represent over 16 million colors.
Appendix A-5