Mailbox Archive File Size vs. Actual Mailbox File Size

Why would a Mailbox Archive File be 3GB if Mailbox File itself is 5.35GB? Are they compressed?
I don't have confidence in the archive file enough to delete the mailbox file yet. (Trying to free up some HD space).
Can one just save the mailbox file and later return it to Apple mail?
Really what is the advantage of the mailbox archive?
Thanks!

Areas of continuos tone can be simplified - therefore reduced - more than areas with lots of detail. For example, if you had a picture of a wall-any single color, light or dark- the compression algorithm could look at the whole wall and define it as a big rectangle and use just a few bytes of information.
In contrast, if you had a scene with many details, it would be necessary to use a finer calculation and representation to avoid losing those details in the compressed image.
DPI= dots per inch and is only really relevant for printing. ie, a 1200x1800 image file printed at 300 dots per inch would be printed as a 4"x6" picture.
If you were to print the same file at 600 dpi, it would be 2"x3" picture.
DPI matters because a picture printed at 600 dpi will normally appear sharper and clearer than one printed at 300 dpi. Most people will recommend that you print at at least 150 dpi in order to get a decent printed picture. This means that you should think about whether you plan to print, and if so, how big you want to print before you take the picture to make sure it will have enough information to fill out the desired picture size at the desired dpi.
Screen dpi (or more accurately, ppi (pixels per inch)) can vary depending on the size and selected resolution of the screen.
So, it is incorrect to say "1600x1200dpi"- the image size is 1600x1200 pixels (about 1.92 MegaPixels), not 1600x1200 dots per inch.
Message was edited by: Mike N. (nahyunil)

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