Help with compress function--file sizes not substantially reduced

I've tried to use the compress function (right click "compress" or Finder/File/Compress) a few times on files from a variety of different programs. While this results in creating a zip file, the file size is not substantially reduced (e.g., from 43.4 MB to 42.9 MB). Is there a way to change how much a file is compressed?
Thanks in advance for your help.
Eric

Not all material is very compressible. Text files and word processor documents usually compress very well. Photos and movies don't compress much if at all due to the nature of their structure (in some cases, using a general-purpose compressor can actually make a file larger). So it will depend on what it is you're compressing.

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