[Bug 114884] New: default compression rate for Jpegs looses data, should be set to 100% quality by default

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[Bug 114884] New: default compression rate for Jpegs looses data, should be set to 100% quality by default

S. Burmeister
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http://bugs.kde.org/show_bug.cgi?id=114884         
           Summary: default compression rate for Jpegs looses data, should
                    be set to 100% quality by default
           Product: digikam
           Version: unspecified
          Platform: SuSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: sven.burmeister gmx net


Version:            (using KDE KDE 3.4.92)
Installed from:    SuSE RPMs
OS:                Linux

I think that the user should not by default loose data when editing pictures. Hence the default-value for Jpeg-quality should be 100% and not 75%.
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[Bug 114884] default compression rate for Jpegs looses data, should be set to 100% quality by default

Gilles Caulier
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------- Additional Comments From caulier.gilles free fr  2005-10-22 20:49 -------
I think this bug report isn't correct.

1 / JPEG isn't a lossLess image file format.
2 / LossLess file format is PNG or TIFF.
3 / Jpeg compression factor to 100% isn't lossless.
4 / Jpeg is dedicaced to web publish, not image edition.

If you want more information about image file format supported in digiKam, please take a look in current handbook (0.8.0 from svn).

Regards

Gilles Caulier
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Re: [Bug 114884] default compression rate for Jpegs looses data, should be set to 100% quality by default

Joern Ahrens
On Saturday 22 October 2005 20:49, Gilles Caulier wrote:

> ------- You are receiving this mail because: -------
> You are the assignee for the bug, or are watching the assignee.
>
> http://bugs.kde.org/show_bug.cgi?id=114884
>
>
>
>
> ------- Additional Comments From caulier.gilles free fr  2005-10-22 20:49
> ------- I think this bug report isn't correct.
>
> 1 / JPEG isn't a lossLess image file format.
> 2 / LossLess file format is PNG or TIFF.
> 3 / Jpeg compression factor to 100% isn't lossless.
> 4 / Jpeg is dedicaced to web publish, not image edition.

You're right Gilles, but this discussion comes up again and again, so why
shouldn't we change it to a 100% default? People are satisfied and who reads
the manual knows it better ;-)

... Jörn

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[Bug 114884] default compression rate for Jpegs looses data, should be set to 100% quality by default

Joern Ahrens
In reply to this post by S. Burmeister
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------- Additional Comments From joern.ahrens kdemail net  2005-10-22 20:55 -------
On Saturday 22 October 2005 20:49, Gilles Caulier wrote:
[bugs.kde.org quoted mail]

You're right Gilles, but this discussion comes up again and again, so why
shouldn't we change it to a 100% default? People are satisfied and who reads
the manual knows it better ;-)

... J?rn

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[Bug 114884] default compression rate for Jpegs looses data, should be set to 100% quality by default

Gilles Caulier
In reply to this post by S. Burmeister
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------- Additional Comments From caulier.gilles free fr  2005-10-22 21:05 -------
Hi Joern,

Because 100% compression factor isn't loosless and because the file sizes will be very increased. There is a risk to have any users to report this point like a bug (:=).

Notes:

- Look like Gimp and photoshop use 75% compression factor by default.
- Provide LoosLess Jpeg compresion in digiKam request new Jpeg codec in image editor. This is can be done when we will use DImage API instead imlib2 for example.

Gilles
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[Bug 114884] default compression rate for Jpegs looses data, should be set to 100% quality by default

Joern Ahrens
In reply to this post by S. Burmeister
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http://bugs.kde.org/show_bug.cgi?id=114884         




------- Additional Comments From joern.ahrens kdemail net  2005-10-22 21:09 -------
On Saturday 22 October 2005 21:05, Gilles Caulier wrote:
> Because 100% compression factor isn't loosless and because the file sizes
> will be very increased. There is a risk to have any users to report this
> point like a bug (:=).


Haha, you're right again. So here is everything said and we can close it.

... J?rn

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[Bug 114884] default compression rate for Jpegs looses data, should be set to 100% quality by default

S. Burmeister
In reply to this post by S. Burmeister
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------- Additional Comments From sven.burmeister gmx net  2005-10-22 21:14 -------
Or make it a wish to introduce lossless-jpeg. :)
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[Bug 114884] default compression rate for Jpegs looses data, should be set to 100% quality by default

Gilles Caulier
In reply to this post by S. Burmeister
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caulier.gilles free fr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID



------- Additional Comments From caulier.gilles free fr  2005-10-22 21:23 -------
Right. Please make a new wish in B.K.O about it.

I close this file.

Gilles
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