[Digikam-users] Thumbnails blury in digiKam 1.0.0

[Gilles Caulier]

This can be relevant of PGF compression level. In digiKam, thumbs
compression is there :

http://lxr.kde.org/source/extragear/graphics/digikam/libs/threadimageio/thumbnailcreator.cpp#501

Last value passed to this method is compression level. Try 3 or 2 to
see if quality is better. You need to force digiKam to rebuild
thumbnails of course.

Note : perhaps it's a problem in LibPGF. I recommend to as to PGF team
also, just to be sure...

Gilles Caulier

2010/1/18 Stedtlund <falolaf at gmail.com>:
> 2010/1/18 Vlado Plaga <rechner at vlado-do.de>:
>> Am Sun, 17 Jan 2010 16:36:09 +0100
>> schrieb Stedtlund <falolaf at gmail.com>:
>>
>>> Hi,
>>>
>>> After upgrading to digiKam most of the thumbnails are blury.
>>
>> Do you mean upgrading digiKam 0.10 (or earlier) to 1.0?
> Yes, that's what I mean. A miss from my side.
>
>>The internal
>> thumbnails format changed. The change is described in the changelog as
>> follows:
>>
>> "General : digiKam use a new database to cache thumbnails instead
>> ~./thumbnails. File format used to store image is PGF
>> (http://www.libpgf.org). PGF is a wavelets based image compression
>> format and give space optimizations."
> I read that too, but I thougth that was going to be possitive...
>
>>
>> I also noticed a decline in thumbnail quality, but I did not consider
>> it problematic enough to write a bug report for it. But maybe you could
>> open one?
> I can do that!
>
>>
>> As I wrote in a comment on a bug report related to this change in
>> digiKam thumbnail storage, I'd still prefer a thumbnail directory
>> shared between applications... but since the type of directory proposed
>> there (with subdirectories made of MD5 hash sums) apparently does not
>> exist for thumbnails yet, this would be a fair amount of work for
>> digiKam developers:
>> https://bugs.kde.org/show_bug.cgi?id=210580#c15
>>
>>> Are there any parameters to tune to get better results?
>>
>> That would be a useful option indeed.
>>
>> Vlado
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