Epson ES-300C Bollettino di assistenza prodotti - Pagina 7

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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

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