Re: coping files & file reduction
- From: Tim Slattery <Slattery_T@xxxxxxx>
- Date: Wed, 26 Dec 2007 09:48:40 -0500
"Patrick Keenan" <test@xxxxxxxx> wrote:
However, if the copy is also *compressed*, which will happen, for example,
with WAV to MP3 conversion, there will be a loss in dynamic range, and that
can certainly be considered a reduction in quality.
That depends on what kind of compression you're using. ZIP files, for
example, use lossless compression, so the restored file is *exactly*
the same as the original file. Image and sound formats, like Jpeg and
MP3, use lossy compression, because losing a few bits here and there
won't affect the quality of the image or sound. But if you use lossy
compression again and again on the same file, the inexactnesses will
add up over time, and the file will degrade.
For a normal copy operation on a computer file - command line "copy"
command or drag-and-drop - you're doing an exact copy, no compression,
no loss. You can do that as many times as you want to and still have
the exact same file.
--
Tim Slattery
MS MVP(Shell/User)
Slattery_T@xxxxxxx
http://members.cox.net/slatteryt
.
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