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Lexmark Optra C710 User's Guide - Page 97

Screen angle, Spot function, Image Smoothing, Printing text

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Different printing needs do require different screen frequency settings, for example, offset printing requires a higher setting, whereas newsprint generally requires a lower setting. Your printer default is set to give you the best screen frequency setting for high quality business graphics. Screen angle Note: The only time you can change the screen angle is when the use color option has been deselected. The reason for this is the default angle ensures no color is overprinted by another color. The default angle of the halftone screen and cells places the dots so they are the least noticeable to the human eye. It also ensures the alignment of color through all four color planes. By avoiding the placement of halftone cells at an angle of 90 degrees, the eyes of the viewer are focused on your image and not on the dots. Spot function The spot function determines the shape of the dots by controlling the order in which the pels in the halftone cell are turned on. The printer code defines the order by assigning a priority to each individual pel within the halftone cell. By turning on or printing a portion of the pels within the halftone cell and then combining the different halftone screens, your printer is able to print millions of colors. Image Smoothing You can turn Image Smoothing On from the graphics tab of your printer driver or through the PostScript Menu. This increases the contrast and sharpness of bitmapped images and smooths color transitions. This setting is useful for images downloaded from the World Wide Web at 72 dpi. The setting has no effect on images downloaded at 300 dpi resolution or higher. Printing text In both PostScript and PCL emulations, 100% black text prints using black toner (K of CMYK). This results in sharp, crisp text characters. As mentioned before, the printer applies a unique screening algorithm to small text (less than 24 points in size). This helps ensure that all text has smooth, crisp edges. Black text included as part of a color bitmap image is printed as a composite black. The result may be fuzzy characters or per- Chapter 4: Controlling your printer 83

Section	Page
Table of contents	3
Using your documentation ix	3
Trademarks xiii	3
1 Introducing your printer 1	3
2 Using printer drivers 5	3
3 Changing printer settings 7	3
4 Using color 75	4
5 Managing memory 89	5
6 Handling paper 95	5
7 Replacing supplies 113	6
8 Solving printer problems 145	6
Appendix A: MarkVision 189	7
Appendix B: Printer specifications 201	7
Appendix C: Fonts 205	7
Appendix D: Safety information 215	7
Appendix E: Notices 227	7
Appendix F: Warranty 239	8
Glossary 241	8
Index 255	8
Using your documentation	9
About the manuals	9
Other sources ofinformation	11
Trademarks	13
Introducing your printer	15
Print speed	16
Memory	16
Color quality	16
Printer drivers	17
MarkVision	17
Paper handling	17
Using printer drivers	19
Changing printer settings	21
Using the operator panel	22
Menus	24
Using color	89
Understanding color	89
Managing color	92
Controlling your printer	94
Color Correction	98
Avoiding print quality problems	100
Managing memory	103
Printer memory	103
Adding memory	104
Flash memory	106
Hard disk	106
Managing resources downloaded to flash or disk	107
Handling paper	109
Paper sources and output bins	109
Paper sizes	110
Media guidelines	112
Storing media	118
Avoiding paperjams	118
Loading paper inthe trays	119
Tray linking	123
Using the multipurpose feeder	124
Replacing supplies	127
Ordering supplies	127
Storing supplies	129
When to replacesupplies	130
Recycling usedsupplies	133
Conserving supplies	133
Replacing supplyitems	134
Replacing print cartridges	135
Replacing the coating roll	140
Replacing the fuser kit	145
Replacing the transfer kit	152
Solving printer problems	159
Printer problems	159
Theory of operation	160
Understanding printer messages	161
Identifying other problems	175
Clearing printer paperjams	182
Clearing duplex unit paperjams	189
Cleaning the print cartridge dust collector	195
Cleaning the waste toner sensor	198
Calling for customer support	202
MarkVision	203
Operating systems supported	203
Introducing MarkVision	204
Installing MarkVision on a network	212
Getting updated utilities and drivers	213
Printer specifications	215
Fonts	219
Printing font samples	219
Resident fonts	220
Symbol Sets	225
Downloadable fonts	227
Safety information	229
Notices	241
Laser notices	245
Warranty	253
Glossary	255
A	255
B	256
C	256
D	257
E	258
F	259
G	259
H	260
I	260
J	260
K	260
L	261
M	261
N	262
O	262
P	263
R	265
S	265
T	267
U	267
V	267
Y	268

Match case Limit results 1 per page

Chapter 4: Controlling your printer

Different printing needs do require different screen frequency

settings, for example, offset printing requires a higher setting,

whereas newsprint generally requires a lower setting. Your

printer default is set to give you the best screen frequency setting

for high quality business graphics.

Screen angle

Note:

The only time you can

change the screen angle is when

the

use color

option has been

deselected. The reason for this is

the default angle ensures no color

is overprinted by another color.

The default angle of the halftone screen and cells places the dots

so they are the least noticeable to the human eye. It also ensures

the alignment of color through all four color planes. By avoiding

the placement of halftone cells at an angle of 90 degrees, the

eyes of the viewer are focused on your image and not on the

dots.

Spot function

The spot function determines the shape of the dots by control-

ling the order in which the pels in the halftone cell are turned on.

The printer code defines the order by assigning a priority to each

individual pel within the halftone cell. By turning on or printing

a portion of the pels within the halftone cell and then combining

the different halftone screens, your printer is able to print mil-

lions of colors.

Image Smoothing

You can turn Image Smoothing On from the graphics tab of your

printer driver or through the PostScript Menu. This increases the

contrast and sharpness of bitmapped images and smooths color

transitions. This setting is useful for images downloaded from

the World Wide Web at 72 dpi. The setting has no effect on

images downloaded at 300 dpi resolution or higher.

Printing text

In both PostScript and PCL emulations, 100% black text prints

using black toner (K of CMYK). This results in sharp, crisp text

characters. As mentioned before, the printer applies a unique

screening algorithm to small text (less than 24 points in size).

This helps ensure that all text has smooth, crisp edges.

Black text included as part of a color bitmap image is printed as

a composite black. The result may be fuzzy characters or per-