1.16 4.1.4.6 Compression

 

• We can make a file smaller by compressing it (unless it is already compressed, then it gets larger)

 

• File compression can make files harder to use in Web documents, but the smaller size makes them faster to download. A good rule of thumb is that when the file is MB is size, compression will have a large impact.

 

• Many file formats have compression built in, including,

images - JPG, GIF

video - MPEG, AVI

programs - installation programs are normally compressed

 

• Typical compression formats include,

zip - zip, medium range compression

gz - g-zip - good compression

Z - unix compression

Stuffit - A Mac compression format

 

• Some files, such as text, will become 1/10 of their original size.