Epson GT-9500 [46/54] Down load dither pattern

44 7/8/96-B

Down load Dither pattern

(1) Code: ESC b

ASCII: ESC b i jd(j^2)

decimal: 27,98 i

hexadecimal: 1B,62 i

(2) Function Down loads the threshold values of the dither pattern.2patterns can be

set to the scanner, and the parameter “i” indicates their identity.

i=0:Pattern A, i=1:Pattern B

The parameter “j” has the value of 4,8,

or 16,and it indicates the number of the

pixel for a side of the square which is

a basic element of the dither pattern.

The data followed “j” are the threshold

values which shall be arranged in the

square for Dither pattern.

The data is arranged in the order shown Fig.1.

Therefor the number of the threshold data

should be j^2.

For example when j=4 then 16,when j=8 then 64 and when j=16 then 256.

The threshold data should be a value from 0 to 255, because the value of

an image data is in a range from 0 to 255.

For example, in the case of a spiral pattern of 4*4 square shown in Fig-2(a).

The threshold value is corresponded to that in the Fig2-(b) respectively.

Fig-2(a)Spiral pattern Fig-2(b)Threshold value for

the spiral pattern

(3) Handshaking

1) ESC b code

2) ACK( 06H )

3) i + j(2 byte)

4)d(j^2)

Note1:The down loaded pattern can be selected by ESC B C0H or D0H.

Note2:The default data is the same as the resident Dither mode A.

13 6 7 14 216 104 120 232

5718

88 8 24 136

4 3 2 9 72 56 40 152

12 11 10 15 200 184 168 248