Epson Expression 636 User Manual - TWAIN 32 - Page 94

Many displays and printers cannot do this and are limited to, monochrome without gradations

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The scanner can read up to 12 bits/pixel/color. Above 8 bits/pixel/color the scanner converts the image data to 8 bits/pixel/color and sends it to the computer. This gives much higher quality. Data format 1 bit/pixel/color 2 bits/pixel/color 3 bits/pixel/color 4 bits/pixel/color 5 bits/pixel/color 6 bits/pixel/color 7 bits/pixel/color 8 bits/pixel/color Monochrome 2 grays 4 grays 8 grays 16 grays 32 grays 64 grays 128 grays 256 grays Color 8 colors 64 colors 512 colors 4,096 colors 32,768 colors 262,144 colors 2,097,152 colors 16,777,216 colors 8 bits 2 bits 1 bit To reproduce an image of more than 2 bits/pixel/color the output device should be capable of producing the same tones. Many displays and printers cannot do this and are limited to monochrome without gradations, or to 8 or 16 or 256 colors. The data format chosen also affects the amount of data necessary for scanning and storing an image. The larger the bits per pixel value chosen, the larger the amount of image data becomes. B-4 Expression 636 Scanner Settings

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B-4
Expression 636 Scanner Settings
The scanner can read up to 12 bits/pixel/color. Above
8 bits/pixel/color the scanner converts the image data to
8 bits/pixel/color and sends it to the computer. This gives much
higher quality.
To reproduce an image of more than 2 bits/pixel/color the
output device should be capable of producing the same tones.
Many displays and printers cannot do this and are limited to
monochrome without gradations, or to 8 or 16 or 256 colors.
The data format chosen also affects the amount of data necessary
for scanning and storing an image. The larger the bits per pixel
value chosen, the larger the amount of image data becomes.
Data format
Monochrome
Color
1 bit/pixel/color
2 grays
8 colors
2 bits/pixel/color
4 grays
64 colors
3 bits/pixel/color
8 grays
512 colors
4 bits/pixel/color
16 grays
4,096 colors
5 bits/pixel/color
32 grays
32,768 colors
6 bits/pixel/color
64 grays
262,144 colors
7 bits/pixel/color
128 grays
2,097,152 colors
8 bits/pixel/color
256 grays
16,777,216 colors
8 bits
2 bits
1 bit