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File Formats
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binary file a file that contains codes which are not part of the *ASCII character set. A binary file can contain any type of information that can be represented by an 8 bit byte with a possible 256 values. *ASCII (American Standard Code for Information Interchange) a standard code used for representing information on computer systems and networks. It uses the printing and non-printing characters that can be generated by the keyboard. Since 7 bits are available to represent each character it is possible to represent a total of 128 different characters. Bit-mapped graphics or Paint images This kind of image is treated as a set of pixels each of which has some colour. Drawing and editing affect the pixels directly. When the image is filed, the information for each pixel is stored. A set of pixels may form a shape such as a circle, but its just a series of dots to the computer. You can erase the dots and draw a new circle, There are actually quite a few types of bit-mapped systems. These include: Bit mapped PICT, JPEG (Joint Photo Exchange Group) and GIF (Compuserve Graphic Interchange Format). These are all important to you as a multimedia and Internet author. Most paint programs create PICT. Aldus SuperPaint creates files in this format (as well as in Object-Oriented format.) Most internet files must be sent in GIF or JPEG format. We'll often use Adobe Photoshop to work with the final draft of these file. Click here for more detail about GIF and JPEG. JPEG and GIF File Format You will usually use the "Save for Web..." function in Photoshop to choose GIF or JPEG compression. Always use JPEG for continuous tone images such as scanned images or digital photos. For solid color, line art or logos GIF is usually preferable. Typically, a compressed file is 1/10 the original size without compression. This depends on the "quality" setting done when compressing.
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