you are sending documents to a commercial printer, ask about the
appropriate halftone screen settings.
Use printers default
Select this option when you often print to
desktop devices such as laser printers, and the default halftone screen
frequency and angle are appropriate for your documents.
Frequency
To specify a halftone screen frequency, clear the Use
printer default checkbox, and enter the frequency in lines per inch in
the text box. A higher frequency requires a higher printer resolution
to produce the same number of grayscale levels in printed halftones.
Angle
If you want to specify the angle of the screens used for half-
toning, rather than use the printers default setting, clear the Use
printer default checkbox, and enter the angle in the Angle checkbox.
Display preferences
Options on the Display tab let you customize the display. You can
control transparency effects, display speed and display quality.
Vector Quality
The options in this pop-up menu affect the entire screen display in
Canvas.
Draft : provides the fastest screen display by drawing vector
objects less smoothly. Choosing this option can increase display
speed by 300%.
Normal : provides fast screen display and draws smooth vector
objects. This is the recommended setting and is selected by default.
Anti-aliased : significantly smooths all objects on screen,
including text and vector objects by anti-aliasing their edges. How-
ever, this anti-aliasing slows the display compared to Draft or Nor-
mal settings. The effect of the anti-aliased option is independent of
the anti-aliased option on the Display tab. If either option is selected,
text is anti-aliased and vice-versa.
Interpolation
When activated, this feature will significantly enhance the visual
quality of scaled images. Interpolation takes place whenever an
image needs to be reduced or downsampled. In other words, when-
ever the number of pixels being displayed is less than the available
number of pixels at the destination. An example of downsampling
would be when a 300 ppi image is set to be displayed at 100%.
Tip
Anti-aliased is especially
useful when you create
screen shots or display slide
shows on screen.
Interpolation is a mathematical
procedure which estimates
values of a function at positions
between listed or given values.