LIS 525 - Bytes in Different File Formats

Which file formats information providers choose can have a big effect on file sizes and hence on server loads. For example, the same sample text
This is a test.
takes up the following different numbers of bytes when stored in some common formats:
Format Bytes
WordPerfect 5.1 766
WordPerfect 10 1,679
RTF 2,527
WordPerfect 9 2,881 1 5,284 2 6,070
PDF 8,827
Microsoft Word 2000 19,456
Microsoft Word 2003 19,968

Here's a comparison for some graphics file formats for a simple Windows dialog snapshot:
Format Bytes Quality
PNG (non-interlaced) 3,105 Good
GIF 3,868 Good
Monochrome bitmap 7,214 Poor
JPEG 12,983 Good
16-color bitmap 26,938 Good
256-color bitmap 54,122 Poor
24-bit color bitmap 158,590 Good
PDF 159,278 Good

Note that the figures for compressed formats, such as JPEG, can differ considerably for a given image size, depending on the number of colours, the complexity of the image, and the degree of compression selected.


Last updated April 16, 2007.
This page maintained by Prof. Tim Craven
E-mail (text/plain only):
Faculty of Information and Media Studies
University of Western Ontario,
London, Ontario
Canada, N6A 5B7