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Expression 636 Scanner Settings B-3
The scale function affects the number of dots scanned. An image
scanned at 180 dpi and 200% has the same number of dots as an
image scanned at 360 dpi and 100%.
To enlarge or reduce the image size, use the scanner’s scale
function through your software at the time of scanning. Avoid
increasing the image size after scanning because the image
quality deteriorates. The default scale 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 × 2 × 2), and 2 bits/pixel/color can
represent 64 colors (4 × 4 × 4). Eight bits/pixel/color (total 24 bits
for a pixel) can represent over 16 million colors.