Scanner Interface

Example:

Main Window

Sub

window

← Overlapped portion

Sub window

(d)Brightness: Byte 16

Specifies the brightness for half tone. For details, see the SET WINDOW command.

(e)Threshold: Byte 17

Specifies the threshold value for line art. For details, see the SET WINDOW command.

(f)Contrast: Byte 18

Specifics the contrast value for half tone or line art. For details, see the SET WINDOW command.

(g)Image composition: Byte 19

Specifies the type of image to be read. The following values are supported by this scanner: X’00’: Line art

X’01’: Half tone

If a value X’02’ or greater is specified, this scanner returns the following error information:

∙ Status:

B’00001’ (CHECK CONDITION)

∙ Sense key: X’5’ (ILLEGAL REQUEST)

(h)Bit per pixel: Byte 1A

Specifies the number of bits per pixel. On this scanner, X’01’ (1 bit) is specified since only binary data is valid for subwindows. If any other value is specified, this scanner returns the following error information:

∙ Status:

B’00001’ (CHECK CONDITION)

∙ Sense key: X’5’ (ILLEGAL REQUEST)

(i)Half tone pattern: Byte 1B and 1C

Specify the halftone method and dithered pattern. For details, see the SET WINDOW command.

Appendix A-74