Bug 108266 - compression level option for saving png's
Summary: compression level option for saving png's
Status: CONFIRMED
Alias: None
Product: kolourpaint
Classification: Applications
Component: general (show other bugs)
Version: unspecified
Platform: Debian testing Linux
: NOR wishlist
Target Milestone: ---
Assignee: kolourpaint-support
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2005-06-28 14:26 UTC by Joerg de la Haye
Modified: 2011-09-28 13:55 UTC (History)
2 users (show)

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Description Joerg de la Haye 2005-06-28 14:26:08 UTC
Version:            (using KDE KDE 3.4.1)
Installed from:    Debian testing/unstable Packages
OS:                Linux

It would be nice to have an option set the quality level for png's, at least like the slider you have for saving jpeg's.
Comment 1 Clarence Dang 2005-06-29 03:52:18 UTC
On Tue, 28 Jun 2005 10:26 pm, Joerg de la Haye wrote:
> It would be nice to have an option set the quality level for png's, at
> least like the slider you have for saving jpeg's.


Aren't PNGs lossless?
Comment 2 Thiago Macieira 2005-06-29 05:49:24 UTC
They are. But you can choose a compression level.
Comment 3 Joerg de la Haye 2005-06-29 09:41:12 UTC
It uses the deflate-algorithm, according to wikipedia.org. It can be found also in ZIP, GZIP and for TIFF. As the usage in ZIP shows, it's lossless.
Comment 4 Joerg de la Haye 2005-06-29 15:46:45 UTC
I've chosen a wrong title for my bug, "quality option for saving png's" is completely incorrect, it has to be "compression level option for saving png's".
I've had a look at the GIMP, they have these option; other KDE programs like krita or kooka don't have it.
Comment 5 Nicolas Goutte 2005-06-29 16:24:20 UTC
Technically, it can be set by QImageIO::setQuality with a 0 (zero) as parameter (that would be the same as gzip -9)

However in KDE there is an history of not letting the user select the gzip compression level. (It cannot be done in KTar and KZip either.)

Have a nice day!
Comment 6 Nicolas Goutte 2005-06-29 21:20:38 UTC
On Wednesday 29 June 2005 16:24, Nicolas Goutte wrote:
(,,,)
> However in KDE there is an history of not letting the user select the


> gzip


Sorry I meant "zlib" here.

> compression level. (It cannot be done in KTar and KZip either.)


(KTar supports gzipped files too.)

>
> Have a nice day!

Comment 7 Clarence Dang 2006-12-17 04:26:50 UTC
Reassigning bugs to KolourPaint support email address.