Just Curious..Or maybe Just a Silly Question

Hi Everyone,

I have a question which may seem pretty simple to a lot of people but 
anyway here goes:

I made some small thumbnails of pictures of animals at the zoo and put them 
in a table. This went fine, then I linked them to the larger photos and 
found that they took way too long to load. So back I went to another 
thumbnail program and thought I would just reduce them to a smaller pic. 
but larger than the thumbnails on the first page.

Am I making sense yet??? Any way after fiddling about for a while I 
realised I could keep them the same size as the original and just make it a 
thumb nail and it significantly reduced the size of the file. For instance 
one went from 273kb to 133kb whilst maintaining the same size picture. To 
my eye the quality looks exactly the same.

Can anyone tell me why the file size reduced when to me it seems I have 
kept it the same size and quality??? Perhaps the quality has been lost 
some..but to me it does not appear to have...


Sharon

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