Documents require compression and optimization for easy storage and download on net connections. As far as transmission of files through e-mails is concerned, voluminous files need to be compressed in order to attain optimal speed in transmission over business networks, via e-mail, and on the World Wide Web. Besides, document compression also frees disk space and restores much of the available storage capacity. It also leads to usage of less bandwidth and transmission time, and elimination of overhead costs for companies. This leads to cost savings. Document compression relieves mail boxes, mail servers and networks of unnecessarily used space and cuts storage costs enormously.
There are many other advantages of document compression. Those who use homepages server for their web site have a limited amount of space so document compression increases their available space. Many mail systems do not allow attachments exceeding a particular file size. So for people sending files by e-mails, reducing file size is a necessity. If files are to be downloaded, whether from the web or from a mail system, it is always convenient if they are of a smaller size, because larger files take longer time to download.
Document compression makes it easy to create and store large files like books, encyclopedias, complete issues of journals, etc, and makes them web-searchable. It enables websites and textual database driven companies to present large and changing volumes of content in a style-independent fashion.
To compress documents, one needs to factor in various issues like compression level, image format (vector or bitmap), number of fonts used, and image resolution. For compression of images in documents, use vector images wherever possible. Vectors are perfectly scalable, and can be compressed into ZIP format. If you must use bitmap, make them as compressible as possible by using compressed and distilled jpegs, using grayscale or at least RGB.