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Table Of Contents
13.3 Resolution
What does resolution mean?
Resolution is a broad term that can refer to different things in different contexts. A detailed discussion of the
different meanings and interrelationships is beyond the scope of this guide. Instead we provide This section
provides a brief overview of the different possible meanings to clarify our use of resolution in PlanetPress
Design.
Term: Means:
Scan
resolution
The resolution at which you scan an image on a scanner. It refers to the number of
samples per inch (spi), where each sample represents a single pixel in the resulting
bitmapped image.
Display
resolution
The resolution of the monitor screen. For example 96 DPI means the screen displays 96
pixels per inch. Thus an image with pixel dimensions of 96 x 96 would measure 1 inch x 1
inch on this monitor screen.
Printer
resolution
The number of spots of ink the printer can produce per inch, commonly measured as dots
per inch (DPI). The use of DPI as a measure can be confusing as it may be interpreted as
meaning one dot of ink maps to one image pixel. In fact the number of spots of ink the
printer uses to represent a single pixel can vary with the halftone screen used for a print
job (the lines per inch (LPI)), the color depth of the image, and the algorithm the printer
uses to represent individual colors.
13.3.1 Image Resolution Settings in PlanetPress Design
In PlanetPress Design you set the image resolutions the document uses for bitmapped images in the
Document dialog box. You set separate resolutions for color, grayscale, and monochrome images. These
resolutions apply to all of the bitmapped images the document contains.
In the case of dynamic images that reference external images, the resolution in effect at the time you install
and/or convert the document is the one that applies to all of the external images the document references.
A resolution that does not completely correspond to the printer’s resolution will require additional RIP
calculations. This may slow down the printing of larger images.
13.3.2 Suggested Resolution Settings
You set a separate resolution for color, grayscale, and monochrome images. On all but very high-end 600 DPI
printers, resolutions greater than those listed below do not result in any noticeable difference in quality to the
human eye.
Color depth: Maximum suggested image resolution:
Color 150 to 200 DPI
Grayscale 150 to 200 DPI
Monochrome 600 DPI
An exception to these recommendations is in the case of a line art image. Line art images should ideally be at
the resolution of the printer. Thus if the printer resolution is 600 DPI, you should set the resolution of the line
art image to 600 DPI.
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