MGMT 1040 Chapter Notes - Chapter 16: Raster Graphics
8 May 2018
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MGMT 1040 Chapter 16 Notes – Summary
Introduction
• Printers and display screens must operate over a wide range of data rates.
• Although most monitors and printers are capable of handling pure ASCII or Unicode
text, most modern output is produced graphically.
• As a mixture of font descriptors, text, bitmap graphics, and object graphics, a page or a
screen at a time, is using a page description language.
• The choice of page description language and mixture of elements is determined by the
capabilities of the printer or graphics card.
• Clearly, output to a printer consisting only of an occasional page or two of text will
certainly not require a high data rate regardless of the output method used.
• The output of high resolution bitmap graphics and video images to a monitor is quite a
different situation.
• If the graphics must be sent to the graphics card as bitmap images, even in compressed
form, with data for each pixel to be produced.
• It may take a huge amount of data to produce a single picture, and high-speed data
transfer will be essential.
• A single, color image on a high-resolution screen may require several megabytes of data.
• It is desirable to produce the image on the screen as fast as possible.
• If the image represents video, extremely high data transfer rates are required.
• This suggests that screen image updates may require bursts of several megabytes per
second, even when data compression methods are used to reduce the transfer rate.
• It may also suggest to you why it is nearly impossible to transmit high quality images
quickly over voice-grade phone lines using modems.
• Contrast the I/O requirements of keyboards, screens, and printers with those of disks
and DVDs.
• Since the disk is used to store programs and data.
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