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10.4: Resize images in Mail prior to sending
Apple Mail (and, presumably, other mail clients) add an overhead to MIME attachments for error-checking. This is applied regardless of the file's format or origin. If you send a Mail-generated attachment to yourself, and then save it your filesystem, is the saved file smaller than Mail reports? If you attach the PSE files to an outgoing mail and then send them to yourself, do they increase in size to around that of the Mail-generated ones? If yes, then Mail has a good excuse for reporting reductions smaller than PSE.
10.4: Resize images in Mail prior to sending
MIME encoded messages gain around 1/3 size. And when the smallest size has 73% difference, than there is something else going on, than just MIME
10.4: Resize images in Mail prior to sending
The extra overhead isn't for error checking, it's for encoding binary attachments in Base64. So since
(log 256 / log 2) / (log 64 / log 2) = 1.333333, there's automatically a 33% overhead when sending MIME attachments with this method.
10.4: Resize images in Mail prior to sending
I stand corrected. Clearly, as gullevek says, there is something more going on here. |
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