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Инструкция по эксплуатации Страница: 29

Epson GT-8500 [29/268] Halftoning

Halftoning

Halftoning adjusts the shade and color of each pixel according to the

shade and color of the surrounding pixels. Setting halftoning to large

results in a sharper contrast between dots. Setting halftoning to small

results in reduced contrast.

Overview 1-15

Содержание

Scanner 1
Preface 3
Contents 5
Appendix 12
Command reference 12
Command usage 12
Manual construction 12
Overview 12
To understand epson scanners 13
To write a scanner control program 13
Using this manual 13
Chapter 1 15
Overview 15
Basic scanning principles 16
What is a scanner 16
Main scan 17
Sub scan 17
Reading color 18
Reading monochrome 18
Epson scanner features 19
Control code construction 21
Function level 21
Parameters 21
Computers and handshaking 22
Image data 23
Image data format 23
As you increase the amount of data you dramatically increase the number of minute differences in color you can represent 24
Overview 24
Line data transfer 25
Block data transfer 26
Brightness 27
Functions 27
Image definition 27
Gamma correction 28
Halftoning 29
Data form definition 30
Data format 30
Resolution 31
Scanning area 33
Color setting 34
Halftoning 35
Image processing 35
Color correction 37
Scanning multiple shade documents for output on devices capable of expressing multiple shades 37
Using scanner features 37
Scanning documents to obtain unprocessed data 38
Scanning documents without multiple shades 38
Scanning multiple shade documents for bi level output devices capable of black and white only 38
Command usage 39
Esc g and other commands 40
Execution commands 40
Start scanning esc g 40
Extended status request esc f 41
Request id esc i 41
Request status esc f 41
Request condition esc s 42
Data form commands 43
Esc c and other commands 43
Set color mode esc c 43
Set data format esc d 43
Esc d and other commands 44
Esc r and other commands 45
Set resolution esc r 45
Set zoom esc h 45
Esc a and other commands 46
Set data order esc k 46
Set scanning area esc a 46
Set zoom and other commands 46
Image setting commands 47
Set brightness esc l 47
Crt display a 48
Set gamma correction esc z 48
Crt display b 49
Printer output a 49
Printer output b 49
Printer output c 49
Download gamma table esc z 50
Set sharpness esc q 50
Image processing commands 51
Set halftoning mode esc b 51
This com m and also enables or disables text enhancem ent technology this function is only available for b5 or a 5 com m and level scanners or higher 51
This com m and enables or disables halftone processing for bi level data and quad level data the type of processing perform ed is outlined below h ow ever the type of processing available differs by scanner m odel see a ppendix b for details 51
Built in dither patterns 52
Download dither pattern esc b 53
Esc b and other commands 53
Set color correction esc m 54
Download color correction esc m 55
Esc m and other commands 55
Auxiliary commands 56
Initialize the scanner esc 56
Set the scanning mode esc g 56
Esc d and other commands 57
Set the line counter esc d 57
Control codes 58
Control option esc e 58
Eject ff 58
Header stx 58
Abort scanning can 59
Negative response nak 59
Normal response ack 59
Command order 60
Id information 60
Control flow 61
Recommended command order 62
Using commands when options are installed 62
Data block structure 64
Data block transfer order 64
Line data structure 64
Block data structure 65
Header 65
Information block 65
Status byte 66
Byte counter 67
Line counter 67
Id information data 68
Image data 68
Scanner state data 70
Transfer order 70
Image data 71
Scanning area 73
Based on these values the limits of the parameters for the esc a command are as follows 74
Based on these values you can calculate the maximum scannable area for various resolution and zoom settings according to the following formulas 74
In dots the maximum main scan value at the maximum resolution 100 zoom 74
In dots the maximum sub scan value at the maximum resolution 100 zoom 74
In dpi the maximum scannable area available 74
Main scan in dots 74
Note the limits of the 74
Parameter depend on your scanner model see your scanner s manual for details 74
Resolution zoom and maximum scannable area 74
Sub scan 74
The id information provides you the following values 74
Setting the scanning area 76
Maximu 77
Resolution 77
Image trimming 1 78
After trimming an image you should resend the esc a command using the following parameters 79
Determining setting values after trimming 79
The parameters for the esc r esc h and esc a command should be set to the following 79
Image trimming 2 80
Main scan reading length inches 80
Main scan resolution dpi 80
Main scan skip length inches 80
Main scan zoom 80
Printer resolution dpi 80
Rough scanned image printing size after trimming 80
Sub scan reading length inches 80
Sub scan resolution dpi main scan horizontal 80
Sub scan skip length inches 80
Sub scan zoom sub scan vertical 80
This section explains how to use the esc r esc h and esc a commands to print a trimmed image on your printer 80
Based on the size of the image you plan to print and on the resolution of the printer use the following formulas to determine the final scanning settings 81
Determining the setting values for printing 81
Main scan zoom 81
Note on scanners that can respond to printers and other various output devices you can set the 81
Sub scan zoom 81
The parameter values for the esc r esc h and esc a commands then become as follows 81
Values to match the horizontal and vertical resolution of your target printer 81
Command error 82
Communications error 82
Error processing 82
Error recovery procedure 82
Scanner s response 82
Error recovery procedure 83
Scanner s response 83
System error 83
Error recover procedure 84
Error recovery procedure 84
Option error 84
Scanner s response 84
Function level and commands 85
Using the function level 85
Command usage 86
Commands and function level table 86
The following table shows which commands are available at each function level 86
Command usage 87
Function level and commands 87
The commands added at each function level are listed in the table below 87
Items not affected by function level 88
Problem the scanner does not scan correctly when a scanner with a different maximum scannable area is connected 89
Typical programming errors and solutions 89
Problem although you have attached a new scanner capable of a higher resolution you cannot achieve that resolution when scanning 90
Problem when connecting a different scanner model in your scsi daisy chain an error message such as the following appears the epson scanner is not connected 90
Problem after connecting a scanner with a higher function level than the previous scanner the new scanner does not operate properly 91
Problem the speed of image data transfer remains the same whether you use a scsi or bi directional parallel interface 91
Problem after using a scanner option automatic document feeder or transparency unit a different program attempts scanning although the second program tries to scan without using the option the option remains operational 92
Problem the scanner scans properly when you use a bi directional parallel interface but when you switch to scsi the scanner no longer operates properly 92
Problem when connecting a different scanner model a time out occurs on your computer and you can no longer scan 93
Problem when writing data from a gt 6000 or gt 4000 to a magneto optical disk an interface error occurs on the scanner 93
About the function level 94
General 94
Option 94
Parallel interface 94
Using the esc i command 94
Command reference 95
Data form definition commands 96
Execution commands 96
Summary of the scanner commands 96
Control codes 97
Image definition commands 97
Image processing commands 97
Supplemental commands 97
Format of the command reference 98
Execution commands 100
Command reference 103
Contents of the esc f status data block 103
Note the numerical value of the byte counter consists of two bytes and the lower byte precedes the higher byte 103
Command reference 105
Contents of the esc f extended status data block 105
Ist 1 indicates option is installed en 1 indicates option is enabled otherwise it is disabled err logical or of pe pj and opn pe 1 indicates paper empty pj 1 indicates paper jam opn 1 indicates cover open 105
Note the numerical value of the byte counter consists of two bytes with the lower byte preceding the higher byte 105
Data form definition commands 112
Command reference 117
Esc d and other commands 117
In the color scanning mode the data format setting defines tones for each of the three primary colors green red and blue 117
Note even when the specified values exceed the capabilities of the computer display or printer data is sent according to the specified format and quantity before scanning you should consider how the image data can be stored or processed 117
Specifying the data format determines the amount of image data in each data block 117
The data format selected by this command determines the effective halftoning mode selectable with the esc b command 117
With multilevel data settings more than 3 bits per pixel per color the halftoning modes are not effective 117
Caution the length of the m ain scan should always be specified in units of 8 dots or an integer m ultiple of 8 o therwise a com m and error occurs in the scanner 125
Image definition commands 130
G am m a table 137
Image processing commands 139
N ote tet text enhancem ent technology esc b is available when the data format is set to 1 bit pixel 150
Auxiliary commands 151
Control codes 159
Interface specifications 163
Serial interface specifications 164
A typical example of cable wiring is shown below 165
Cable wiring 165
In this table the direction of the signals is given relative to the scanner 165
Interface specifications 165
Signal pin assignments 165
Parallel interface specifications 166
In this table the direction of the signals is given relative to the scanner 167
Interface specifications 167
Signal pin assignments 167
All interface conditions are based on ttl level 168
Interface specifications 168
Return denotes the twisted pair return to be connected at signal ground level for interface wiring be sure to use a twisted pair cable for each signal and to complete the connection on the return side these cables should be shielded and connected to the chassis of the host computer and the scanner 168
Timing charts 169
Basic specification 170
Electrical specification 170
Functions 170
Logic level 170
Scsi interface specifications 170
Terminator 170
Command chart 171
Id switch setting 171
Interface specifications 171
The id switch numbers correspond to the available id and can be set from 0 to 7 the numbers 8 and 9 should not be used 171
The scsi id is set with the id switch mounted on the back of the scanner 171
This device uses the following group 0 processor commands 171
Status list 172
Connector pin arrangement 173
Interface specifications 173
Message list 173
In this table the direction of the signals is given relative to the scanner 174
Interface specifications 174
Signal pin assignments 174
Communication operation 175
Scsi operation procedure 175
Scsi commands 177
Unit attention condition 178
Following is a description of the individual bits and bytes 179
Interface specifications 179
Sense data 179
The extension sense data format is used for the sense data created when an error occurs this format is described below 179
This is the illegal length bit when set to 1 this bit indicates that the transfer length or assigned length specified with a command is not the same as the actual data length required by the scanner 179
When set to 0 this bit indicates that the data in the data byte is invalid when set to 1 the data is valid 179
Information byte 180
Sense keys 180
Default settings 181
Hardware initialization 181
Initialization 181
Software initialization 181
Scanner model technical data 183
Error indications 184
Gt 1000 technical data 184
Physical characteristics 184
Scanner model technical data 185
Software defaults 185
Software functions and settings 185
The function level of the gt 1000 is b2 the table below lists the functions and settings that can be controlled with software commands 185
With the dip switches at the preset factory settings the following values are the default values on the gt 1000 when the power is turned on 185
Baud rate settings 186
Dip switch setting 186
Scanner model technical data 186
The gt 1000 has one bank of dip switches on the control panel the tables below show the function of each switch and the preset factory settings the shaded boxes show the factory settings 186
Gamma correction esc z command 187
Halftoning mode esc b command 187
Scanner model technical data 187
Request identity command 188
Scanner model technical data 188
The gt 1000 sends the following data block when it receives the 188
The identity data block 188
Request condition command 189
Scanner model technical data 189
The condition data block 189
The gt 1000 sends the following data block when it receives the 189
Scanner model technical data 190
Error indications 191
Gt 4000 technical data 191
Physical characteristics 191
Scanner model technical data 192
Software functions and settings 192
The function level of the gt 4000 is b3 the table below lists the functions and settings that can be controlled with software commands 192
Commands are affected by dip switch settings 193
Scanner model technical data 193
Software defaults 193
The default values for the 193
With the dip switches at the preset factory settings the following values are the default values on the gt 4000 when the power is turned on 193
Dip switch 1 settings 194
Dip switch setting 194
Scanner model technical data 194
The gt 4000 has one bank of dip switches on the control panel the tables below show the function of each switch and the preset factory settings the shaded boxes show the factory settings 194
Dip switch 2 settings 195
No other combination of sw 1 7 and sw 1 8 should be made direct printing is available only when the gt 4000 is directly connected to a printer through the parallel interface this function has no relation to ordinary software controls see the gt 4000 user s guide for further details 195
Scanner model technical data 195
Color correction esc m command 196
Gamma correction esc z command 196
Scanner model technical data 196
Request identity command 197
Scanner model technical data 197
The gt 4000 sends the following data block when it receives the 197
The identity data block 197
Scanner model technical data 198
Request condition command 199
Scanner model technical data 199
The condition data block 199
The gt 4000 sends the following data block when it receives the 199
Scanner model technical data 200
Error indications 201
Gt 6000 es 300c technical data 201
Physical characteristics 201
Scanner model technical data 202
Software functions and settings 202
The function level of the gt 6000 is b3 the table below lists the functions and settings that can be controlled with software commands 202
Commands are affected by dip switch settings 203
Scanner model technical data 203
Software defaults 203
The default values for the 203
With the dip switches at the preset factory settings the following values are the default values on the gt 6000 when the power is turned on 203
Dip switch 1 settings 204
Dip switch setting 204
Scanner model technical data 204
The gt 6000 has one bank of dip switches on the control panel the tables below show the function of each switch and the preset factory settings the shaded boxes show the factory settings 204
Dip switch 2 settings 205
Scanner model technical data 205
Sw 2 8 should be set to off for normal scanner operation this switch should be set to on only when the direct printing function is used 205
To use the direct printing function sw 2 8 should also be set to on no other combination of sw 1 7 and sw 1 8 should be made direct printing is available only when the gt 6000 is directly connected to a printer through the parallel interface this function has no relation to ordinary software controls see the gt 6000 user s guide for further details 205
Color correction esc m command 206
Gamma correction esc z command 206
Halftoning mode esc b command 206
Scanner model technical data 206
Request identity command 207
Scanner model technical data 207
The gt 6000 sends the following data block when it receives the 207
The identity data block 207
Scanner model technical data 208
Scanner model technical data 209
Request condition command 210
Scanner model technical data 210
The condition data block 210
The gt 6000 sends the following data block when it receives the 210
Scanner model technical data 211
Gt 6500 es 600c technical data 212
Physical characteristics 212
Error indications 213
Es 600c 213
Gt 6500 213
Scanner errors are displayed by the digital indicator as shown below the ready light remains on after a command error 213
Scanner errors are displayed on the control panel by a combination of the error and ready lights as shown below 213
Scanner model technical data 213
The error indications are different for the gt 6500 and the es 600c both versions are listed below 213
Scanner model technical data 214
Software functions and settings 214
The function level of the gt 6500 is b4 the table below lists the functions and settings that can be controlled with software commands 214
Commands are affected by dip switch settings 215
Scanner model technical data 215
Software defaults 215
The gt 6500 default values for the 215
With the dip switches at the preset factory settings the following values are the default values on the gt 6500 when the power is turned on 215
Dip switch 1 settings 216
Dip switch setting 216
Gt 6500 216
Scanner model technical data 216
The dip switch settings are different for the gt 6500 and es 600c both versions are listed below 216
The gt 6500 has two banks of dip switches on the front of the scanner the tables below show the function of each switch and the preset factory settings the shaded boxes show the factory settings 216
Baud rate settings 217
Printer type for direct printing 217
Scanner model technical data 217
To use the direct printing function sw 2 8 should also be set to on no other combination of sw 1 7 and sw 1 8 should be made direct printing is available only when the gt 6500 is directly connected to a printer through the parallel interface this function has no relation to ordinary software controls see the gt 6500 user s guide for further details 217
Color correction esc m command 218
Dip switch 2 settings 218
Gamma correction esc z command 218
Halftoning mode esc b command 218
Scanner model technical data 218
Dip switch 1 settings 219
Es 600c 219
Scanner model technical data 219
The es 600c has one bank of dip switches on the front of the scanner the table below shows the function of each switch and the preset factory settings the shaded boxes show the factory settings 219
Request identity command 220
Scanner model technical data 220
The gt 6500 sends the following data block when it receives the 220
The identity data block 220
Scanner model technical data 221
Scanner model technical data 222
Request condition command 223
Scanner model technical data 223
The condition data block 223
The gt 6500 sends the following data block when it receives the 223
Scanner model technical data 224
Error indications 225
Gt 8000 es 800c technical data 225
Physical characteristics 225
Scanner model technical data 226
Software functions and settings 226
The function level of the gt 8000 is b4 the table below lists the functions and settings that can be controlled with software commands 226
Scanner model technical data 227
Software defaults 227
The following values are the default values on the gt 8000 when the power is turned on 227
Request identity command 228
Scanner model technical data 228
The gt 8000 sends the following data block when it receives the 228
The identity data block 228
Scanner model technical data 229
Scanner model technical data 230
Request condition command 231
Scanner model technical data 231
The condition data block 231
The gt 8000 sends the following data block when it receives the 231
Scanner model technical data 232
Error indications 233
Gt 8500 es 1000c technical data 233
Physical characteristics 233
Scanner model technical data 234
Software functions and settings 234
The function level of the gt 8500 is b5 the table below lists the functions and settings that can be controlled with software commands 234
Scanner model technical data 235
Software defaults 235
The following values are the default values on the gt 8500 when the power is turned on 235
Request identity command 236
Scanner model technical data 236
The gt 8500 sends the following data block when it receives the 236
The identity data block 236
Scanner model technical data 237
Scanner model technical data 238
Request condition command 239
Scanner model technical data 239
The condition data block 239
The gt 8500 sends the following data block when it receives the 239
Scanner model technical data 240
Scanner model technical data 241
Error indications 242
Gt 9000 es 1200c technical data 242
Physical characteristics 242
Scanner model technical data 243
Software functions and settings 243
The function level of the gt 9000 is b4 the table below shows the list of the functions and settings that can be controlled with software commands 243
Scanner model technical data 244
Software defaults 244
The following are the default values of the gt 9000 at power on 244
Request identity command 245
Scanner model technical data 245
The gt 9000 sends the following data block when it receives the 245
The identity data block 245
Scanner model technical data 246
Scanner model technical data 247
Scanner model technical data 248
Request condition command 249
Scanner model technical data 249
The condition data block 249
The gt 9000 sends the following data block when it receives the 249
Scanner model technical data 250
Error indications 251
Gt 5000 action scanner ii technical data 251
Physical characteristics 251
Scanner model technical data 252
Software functions and settings 252
The function level of the gt 5000 is b5 the table below lists the functions and settings that can be controlled with software commands 252
Scanner model technical data 253
Software defaults 253
The following are the default values of the gt 5000 at power on 253
Request identity command 254
Scanner model technical data 254
The gt 5000 sends the following data block when it receives the 254
The identity data block 254
Scanner model technical data 255
Scanner model technical data 256
Request condition command 257
Scanner model technical data 257
The condition data block 257
The gt 5000 sends the following data block when it receives the 257
Scanner model technical data 258
Scanner model technical data 259
Error indications 260
Gt 300 es 300gs technical data 260
Physical characteristics 260
Scanner model technical data 261
Software functions and settings 261
The function level of the gt 300 is a5 the table below lists the functions and settings that can be controlled with software commands 261
Scanner model technical data 262
Software defaults 262
The following values are the default values on the gt 300 when the power is turned on 262
Request identity command 263
Scanner model technical data 263
The gt 300 sends the following data block when it receives the 263
The identity data block 263
Scanner model technical data 264
Request condition command 265
Scanner model technical data 265
The condition data block 265
The gt 300 sends the following data block when it receives the 265
Condition data block 266
Scanner model technical data 266
Scanner model technical data 267

Epson GT-8500 [29/268] Halftoning

Содержание

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