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image file dimensions and size.

Posted on 2004-11-23
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hello experts,

is it at all possible for a jpg/jpeg/gif file of dimensions 340px/220px to be bigger than 32bytes in size.
Where can I read up on this kind on information.
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Question by:claracruz
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by:JoshPowell
ID: 12655306
Yes it it possible, if you save a JPG file at 100% quality (semi-lossless) then it will be very large in size. The exact size depends on the number of colors in the file, and other varibles.

Josh
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by:claracruz
ID: 12655514
I see, thank you.
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by:claracruz
ID: 12655525
could you possibly give more indepth information as per number of colors and other variables.

Cheers!!
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JoshPowell earned 2000 total points
ID: 12655579
Some more info regarding different file formats and their good/bad traits,
http://www.scantips.com/basics09.html

Basically, the more colors there are, the larger the file will be - this holds true with any image format.. there is no exact ratio, as it depends on how big the image is, and how much each color is used, etc.

For JPGs, the file size depends greatly on the "Quality" - that is, the setting that determines the amount of loss, if can be any number between 0 and 100.

For GIFs, the file size depends solely on the amount of colors and/or dithering, the maximum colors a GIF can contain is 256, although you can, depending on your image editing program, force this number lower (not higher). Dithering is a way of 'blurring' the image if you will, so it uses fewer colors, and gives the appearance of a higher quality.

Josh
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by:JoshPowell
ID: 12655597
Oh, and be sure to check out that link, at the bottom of the page their are links to pages that go into very specific details for each major image format.

Josh
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