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Introduction
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Figure 12 Simple Video System
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the monitor and video adapter limit the number of pixels a computer system can display Figure 12 illustrates the components of a typical video system The frame buffer is a block of video memory that controls the color of each pixel on the monitor Each pixel has a corresponding memory location, usually ranging in size from 1 to 32 bits On many systems, video memory can be read from and written to just like any other memory location An application can change the color displayed on the monitor just by changing a memory value The video controller converts the values in the frame buffer to a signal that can be displayed by the monitor Computer printers are also used to display images These days most printers employ a similar mechanism to video systems They divide the image into a number of pixels, but with a much higher density than a computer monitor does, typically 300 or 600 pixels per inch for an office printer Printers designed for typesetting applications use even higher densities The printer contains memory analogous to the frame buffer, except that data is transmitted over a serial or parallel cable rather than directly through the system bus The image gets built in the printer's memory and then gets written to the printed page Not all printers work by mapping memory to pixels Plotters used for drafting and other engineering work have pens controlled by commands, such as draw a line from one point to another, draw an ellipse within a specified rectangle, or draw text using a specified font at some location1
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Back in the old days, computer monitors for graphics worked this way as well
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Vector and Bitmap Graphics Just as display devices have two general methods of operation, graphics file formats can be divided into two general classes, vector and bitmap2 Vector graphics formats use a series of drawing commands to represent an image A Windows metafile is a commonly used vector graphics format Figure 13 contains a simple vector image created using commands to draw two arcs and a rectangle Vector graphics formats are not limited to output devices, such as plotters, that create images through drawing commands Computer monitors and laser printers usually have software that converts vector commands into pixels There are two main drawbacks with vector graphics First, they are not suitable for reproducing photographs or paintings A painting such as Whistlers Mother would require tens of thousands of drawing commands simply determining which commands to use to represent the painting would be a monumental task Second, complex images take a long time to display On most display systems, each vector object has to be converted to a pixel image All of the image formats covered in this book are bitmap image formats Such formats represent images as 2-dimensional arrays where each array element represents a color to be displayed at a specific location When displayed on a computer screen, each element is generally mapped to a single screen pixel If pixels are close enough on the display device, it becomes difficult for the human eye to detect the array structure that composes the image The greatest advantage of bitmap images is their quality As the amount of disk space and memory has increased along with the speed of processors, the use of bitmap images has expanded as well One of the most visible examples of this is in the computer game industry Currently even games that require high performance, such as flight simulators and shoot-em-ups, use bitmap graphics Contrast the graphics in games like Quake and Doom to the vector graphics of Tank or even the Death Star graphics in the original Star Wars movie A major drawback with bitmap images is the amount of data required to hold them The size of an image in bytes (not counting overhead) is width height bits per pixel + 7 8 Thus, an 800 x 600 image with 24 bits per pixel requires 1,440,000 bytes of memory to display or disk space to store As the amount of memory on computers has grown, so has the number and size of images that can be displayed at the
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