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.

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Polaroid BLL Generator manual Important Concepts, Device Dots Image Resolution Approx. DPI