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shakey

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Since: Dec 09, 2006
Posts: 3



(Msg. 1) Posted: Sat Mar 15, 2008 6:03 pm
Post subject: JPG compaction
Archived from groups: rec>photo>digital (more info?)
Does anyone know for sure if the "compact old files" command in Windows XP
causes any degrading of JPG files?
Getting no definite answers in MS XP groups.

SG

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Ray Fischer

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Since: Dec 21, 2005
Posts: 345



(Msg. 2) Posted: Sun Mar 16, 2008 1:20 am
Post subject: Re: JPG compaction [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
shakey <noone RemoveThis @nearsonic.net> wrote:
>Does anyone know for sure if the "compact old files" command in Windows XP
>causes any degrading of JPG files?
>Getting no definite answers in MS XP groups.

It does not degrade any of the files it compresses. Decompressing
will result in a file identical to the original.

Of course, it won't actually make a jpg file any smaller, either,
because jpg files are already compressed.

--
Ray Fischer
rfischer RemoveThis @sonic.net

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Jürgen Exner

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Since: Dec 18, 2007
Posts: 115



(Msg. 3) Posted: Sun Mar 16, 2008 1:45 am
Post subject: Re: JPG compaction [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"shakey" <noone DeleteThis @nearsonic.net> wrote:
>Does anyone know for sure if the "compact old files" command in Windows XP
>causes any degrading of JPG files?

It's a standard lossless compression algorithm that is used for any file
type. Would be pretty bad if let's say a database would be "degraded" by
this compression, wouldn't it?
Of course it's mostly pointless for JPEG files because the JPEG format is
compressed already. It's rather unlikely that the XP compression algorithm
would do noticably better.

jue
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