Bug 169432

Summary: introduce setting to always save to a lossless format
Product: [Applications] digikam Reporter: S. Burmeister <sven.burmeister>
Component: Setup-ImageEditorAssignee: Digikam Developers <digikam-bugs-null>
Status: RESOLVED FIXED    
Severity: wishlist CC: caulier.gilles
Priority: NOR    
Version: 0.10.0   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed In: 2.4.0
Sentry Crash Report:

Description S. Burmeister 2008-08-19 11:27:40 UTC 
Version:           0.10 beta2 (using KDE 4.1.0)
OS:                Linux
Installed from:    SuSE RPMs

There was a lengthy discussion about how to warn the user about lossy saving of images. One solution would be to convert all images to a lossless format when downloading them, however this makes downloading images very slow.

The conversion of a lossy format to a lossless is only neccessary, if the user edits and saves an image. So from my point of view it would make sense to only convert those images that are edited.

To achieve this one could offer a setting that allows the user to enable "always save to lossless format [format drop-down]". So instead of having to pick a lossless format everytime one saves a file, digikam does so automatically.

This is faster and more efficient than converting all pictures while downloading and more comfortable than having to change the format everytime one saves an image.

If seen as sensible one could even integrate this into the save dialogue warning, i.e. the warning would not just state "saving to JPEG losses information", but offer a checkbox "always save to a lossless format".
Comment 1 caulier.gilles 2008-12-03 12:59:32 UTC 
In editor, when you use File/Save As, PNG file format is always proposed by default. PNG is LossLess, support 16 bits color depth, and preserve all metadata.

I'm not agree to add another "File/Save to LossLess" option in interface.

Of course, more info in Save As dialog settings can be add to identify which image format is lossless. Currently, PNG, TIFF, and JPEG2000 (if right option is used)

Gilles Caulier
Comment 2 caulier.gilles 2008-12-25 14:26:04 UTC 
Andi, Marcel,

I would to close this file as WONTFIX, as i explain in comment #1.

Your viewpoints ?

Gilles Caulier
Comment 3 Marcel Wiesweg 2008-12-26 16:55:44 UTC 
ok for me
Comment 4 Andi Clemens 2008-12-27 14:53:37 UTC 
Sorry for the delay..

ok for me too!
Comment 5 S. Burmeister 2008-12-29 13:02:17 UTC 
This is not about adding anything to the menu. Rather to the settings. so if the user saves a JPG it will always and automatically saved as e.g. PNG.
Comment 6 caulier.gilles 2011-11-24 09:20:07 UTC 
Sven,

For me, this entry is solved with versioning feature introduced in 2.x serie. You can always save image from editor to lossless format. Just turn on versioning and use right image format in setup dialog (PNG, TIFF, PGF, JPEG2000)

Gilles Caulier