[Gimp-user] Gimp-user Digest, Vol 66, Issue 24

[Peter Taylor]

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> Today's Topics:
>
>    1. Re: file extensions and when to use them (Patrick Shanahan)
>    2. Re: file extensions and when to use them (David Gowers)
>    3. Re: file extensions and when to use them (David Hodson)
>    4. Re: file extensions and when to use them (norman)
>    5. installing scripts (norman)
>    6. Re: installing scripts (Choi, JiHui)
>    7. Re: installing scripts (norman)
>    8. Re: installing scripts (Choi, JiHui)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 21 Mar 2008 20:18:25 -0400
> From: Patrick Shanahan <ptilopteri at gmail.com>
> Subject: Re: [Gimp-user] file extensions and when to use them
> To: gimp-user at lists.XCF.Berkeley.EDU
> Message-ID: <20080322001825.GA902 at wahoo.no-ip.org>
> Content-Type: text/plain; charset=us-ascii
>
> * norman <norman at littletank.org> [03-21-08 13:06]:
>   
>> I usually shoot in RAW and convert with UFraw plugged in GIMP. Then I
>> have a choice of extensions to use for saving the file produced. I
>> presume that if I use .xcf there is no compression and if I use .jpg
>> there will be some compression. When working on the file I assume it is
>> best to save as .xcf and not to use .jpg until the picture is finalised.
>> I would like to know how the contents of the .jpg file so formed compare
>> with the contents of a .jpg saved directly on the camera.
>>
>> The reason I ask is because I would like to use PTLens to remove CA but
>> it seems that the software will only work with .jpg.
>>     
>
>  *compression* is not the problem as such.  "lossey" compression is
> the problem, you *lose* some of the definition of your object/picture
> when you *save* it as jpg.  jpg is a lossey compression scheme.
>
> If ptlens is your *only* choice, you have no choice except to perform
> that operation as the last operation.  You will still have a minimum
> of two lossey saves.
>
>   
The plugin version of PTlens supports TIF files (the standalone does 
not!). I am using the plugin with GIMP 2.4.1 on windows xp with no problem.

Peter Taylor