Mailing List flyrotary@lancaironline.net Message #2853
From: Al Gietzen <ALVentures@cox.net>
Subject: RE: [FlyRotary] Re: File size
Date: Tue, 9 Sep 2003 10:44:20 -0700
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

 

 

When you are transmitting a binary file, like a picture, the actual size

of the transmission increases.

Why? Because the binary data is being transmitted in visible characters,

sort of 6 bit "bytes". In other words 8 bit bytes are expanded into 6

bit "bytes".   So the size increases by at least 8/6 = 33%.

On top of that you have all the mail headers.

 

View the "Message Source" of a received message containing pictures

sometime and note the

"Content-Transfer-Encoding: base64" tag preceeding the block of 6-bit

ASCII characters representing the picture. 6 bits gives you 64 possible

characters.

 

Finn

 

So I guess Marv was right – it’s the new math.

 

Al

 

> "Al Gietzen" <ALVentures@cox.net>:

>

> Marv;

>

> How does your e-mail system add-up bytes?  I sent a posting that had 3

> attached files totaling 82KB.  The letter itself was 224 bytes.  It was

> rejected as beign over 100KB.

>

>

> Maybe it's time to increase the limit?

>

>

> Al

>

 

 

 

 

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