Two files compressed from an original with 16,777,216 pixels and 16,777,216
colours...

One is a .png file, 133,450 bites...
http://www.blind-apertures.ca/pics/16MillionColours.png

The other is a .jpg, 7,416,217 bytes...
http://www.blind-apertures.ca/pics/16MillionColours.jpg

Which one has lost about 3/4 of the original data?

Take Care,
Dudley