programs can use or create only text files, others only graphic files, and
yet others can use and create both. You identify file types by the file
extension. The file extension is a three character code that follows the
file name, separated by a decimal (.). For example, you can assign the
file name MEMO.DOC to a memorandum. The DOC extension identifies this
file as a text file. The following paragraphs identify some of the common
graphic files. Remember, always refer to the software users manual to
determine what type of files you can use with a specific software package.
a. PCX files are widely used in graphics programs. These files store
graphics images as patterns of dots (bitmapped). When you scale these
files to a larger size, the lines and images appear to have ragged edges.
b. IMG files are also bitmapped files and are used by the Ventura
desktop publishing program and others.
c. TIFF, that stands for tagged image file format, is a graphic file
type. Many word processing packages have the capability to import this
type of graphics file.
d. CGM, that stands for computer graphics metafile, is an object
graphics format. Object format means that the image is stored as a
geometric shape and for this reason, retains its clarity when you scale it
to a larger or smaller size.
11. Summary.
This completes lesson 3 and the subcourse. Before beginning the
examination, complete the practice exercise found on the following pages
and compare your answers with those on the answer key and feedback sheet.
If any of your answers are incorrect, review the area indicated until you
understand the material.
3-13
SS0525
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