Storing Images
We currently copy the 768x512-pixel image to the server and reduce its color palette from 16 million to
256 colors. This is only 1/48th of the information in the original image on the Photo-CD but is adequate
for several reasons: 1) this is a good size for viewing on most monitors (the next larger size, 1538x1024
pixels, will not fit on a 1024x768 monitor); the network transfer time of five seconds is tolerable; 3)
modern color dithering algorithms are so effective that the difference in appearance between an image
displayed with 16M colors (24-bit color) and one displayed with 256 colors (8-bit color) is surprisingly
very small; and 4) the disk space required on the server is tolerable: about 200KB to 390KB per image in
uncompressed bit-mapped format (.BMP).
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