Epson ES-300C Bulletin d'information sur les produits - Page 7

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Epson ES-300C Bulletin d'information sur les produits
Gamma
The function that defines the light intensity ratio between the
Function:
original image and the output data. The ES-300C scanner allows
the function to be altered so that when the image is reproduced
on a different type of output device, the tones in the reproduced
images will be closer to the original image.
Grayscale:
A term used to describe the output of devices that support more
than just black and white. Grayscales support up to 256 shades
of gray. The table below details the number of data bits required
to show the number of possible gray levels.
Halftone:
The output in 1 or 2 bit data format that simulates grayscale by
Highlight:
The brightest value in a continuous tone or halftone image.
Line Art:
tine Screen:
typical line screen - sixty five halftone dots per inch at a forty five
Matrix:
Number of
Bits
1
2
3
4
5
6
7
8
creating a pattern of small dots that vary in size and density.
Halftones are used in newspapers to display photographs. The
Epson ES-300C supports 3 types of halftoning.
Images consisting of only black and white pixels. Text is a good
example of line art.
Also known as screen ruling, it is the distance between the
centers of halftone dots. For example, a newspaper uses a
degree angle for photographs.
The square grid that forms the halftone dots. As the matrix size
increases, more possible variations on dot size and shape are
available.
PSB No: P-0078
Page: 2 of 3
Possible Gray Levels
2 (black and white)
4 grays
8 grays
16 grays
32 grays
64 grays
128 grays
256 grays