Image Example - Photo

• 834 pixels wide by 692 pixels tall
• total of 577,128 pixels
• full color (24-bit)
• requires 24/8 = 3 bytes per pixel
• total of 1,731,384 bytes in memory

 
• disk space required depends on . . .
  • file format
  • program used

• The type of file also affects how much information is saved and how the picture looks.

 
• The file types .bmp, .png, and .tif all store every single pixel without any changes.

 
• The file type .gif reduces the number of colors to 256, which can cause problems rendering an image with a lot of colors.

 
• The file type .jpg "adjusts" some of the pixels in an attempt to reduce the overall file size.

 
• While the adjustments are often difficult to detect, they are sometimes quite obvious.

png	jpg
png	gif

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Comments and suggestions should be sent to:
email: sturges@iastate.edu
phone: 515-294-6242.

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© 2001, Leroy D. Sturges
( This document was last updated on )