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MathGroup Archive 2006

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Re: How to change file names?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70855] Re: [mg70819] How to change file names?
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Mon, 30 Oct 2006 05:32:14 -0500 (EST)
  • References: <200610280922.FAA16139@smc.vnet.net>

Aside from the weird 1/10th file size problem, it wouldn't be a good
idea to read a JPEG and then write it out if one wanted to retain all
the information in the picture, since a JPEG save is lossy.

So, why not use RenameFile? You could also use StringExpression to
help you rename the files.

On 10/28/06, solidifire <barabbasgospel at yahoo.com.tw> wrote:
> There are n JPEG files, with file names f1, f2, ..., fn.
> I want to change their names to, for example, g1, g2, ..., gn.
> Of course the easiest way is to change file names by myself,
> but this is not convenient when n is large.
> How should I do by using Mathematica?
> I tried:
>
> Export["g1.jpg",
>   Import["f1.jpg", "JPEG"], "JPEG"]
>
> It does change the file name as I expect.
> There is, however, a side effect:
> somehow the file size in bytes of g1.jpg is one-tenth of that of
> f1.jpg.
> Besides, I have to read in the files and then write out the files
> -- I don't think these two steps are really necessary,
> because all I want to do is to change the file names.
> Is there any better method?
> Thank you in advance.
>
>


-- 
http://chris.chiasson.name/


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