6 terapixels in total.
200 How to Do Everything: Digital Camera
Understand File Extensions
The many file formats used on computers today are generally referred to by the letters that
make up their three-letter extension (some file extensions have four letters, but those are less
common). Computer files are generally named using a standardized system that looks like this:
filename.ext
The filename can generally be almost anything??”a random collection of numbers and
letters or a word or two that describe the contents of the file. The three-letter extension tells
the computer what kind of data is within the file. Here are a few common file extensions:
?– .doc Word processing document (usually created by Microsoft Word)
?– .xls Spreadsheet document (usually created by Microsoft Excel)
?– .mp3 Digital music file, commonly downloaded from the Internet
?– .htm Web page document
In other words, you and I, as users, control the first half of the filename. The file
extension??”the part that comes after the period??”is determined by the program that made
the file or the file format that the data corresponds to. If you open a folder on your computer
and find a bunch of image files, you can immediately tell what format they are in by looking
at their extension, as in the illustration below.
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