Re: [Declude.JunkMail] OT - Copying 200,000 plus files

[Michael Graveen]

I think the question was about zipping graphic files, which as a general 
rule, don't get much smaller after they're zipped (as compared to text 
files, etc.).  I wasn't taking about the compression contained in a 
particular graphic format.  I get about 15%-25% reduction zipping the 
"uncompressed" BMP file vs about 70% from a Word doc (using the stock 
Winzip settings).  I should have been clearer in my first response.

Mike
At 06:43 PM 10/20/2004, you wrote:
Huh?  The logic flaw in trying to zip first, then copy aside (since the file
would have to first be copied into RAM, then zipped, then stored back onto
the USB drive...better just to copy)... uncompressed TIFFs (TIFFs have had
an option for LZW compression since the mid 90s) compress pretty well as
they contain raw raster data, as do BMPs and many other uncompressed
formats.
If you're referring to JPEGs and GIFs, that's because they are already
compressed.  JPEGs have built-in lossy compression, but high quality JPEGs
(low compression) can still see decent compression, and GIFs are already LZW
compressed, which means more LZW compression generally doesn't yield much.
So, it depends on the type of image, but TIFFs are generally uncompressed
these days due to the LZW copyright fiasco, or may have run-length encoding
which still compresses reasonably well with LZW.
Darin.
----- Original Message -----
From: "Michael Graveen" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, October 20, 2004 6:11 PM
Subject: Re: [Declude.JunkMail] OT - Copying 200,000 plus files
Graphic files as a general rule don't compress well.
Mike
At 03:26 PM 10/20/2004, you wrote:
>Jeff Pereira wrote:
>>What's killing me is not so much the amount of data, but the fact that
>>there are so many small files.  I'm gonna have to try XCOPY on the
>>next folder and see how that works.
>
>I can't remember but do TIFF files compress well?  Might be worth it to
>ZIP them and copy that over.
>
>Jim
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