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Important Concepts 31
Important Concepts
This section explains resolution, color fidelity, and the differences between bitmaps and objects.
Resolution
Resolution can be defined in many ways. Dots per inch (DPI) is a common definition, but an impractical
one for slides and overhead transparencies because the DPI changes significantly when the image is
projected.
The most practical definition of
resolution
is the total number of dots (or pixels) in the image. The
following table compares the image resolution of several graphics output devices.
Device Dots Image Resolution approx. DPI
VGA screen 640 by 480 307,200 58 (on 17” CRT)
Most laser printers 2400 by 3276 7,862,400 300
All LFR film recorders 4096 by 2731 11,186,176 2790 (on 35mm film)
LFR
Mark III, Mark V
8192 by 5461 44,736,512 5945 (on 35mm film)
LFR Mark VI 16384 by 13438 220,168,192 11890 (on 35mm film)
Images produced by the LFR
Mark VI
contain over 716 times more dots than images on a VGA screen.