[Digikam-devel] Thumbnails

[Mikolaj Machowski]

On Sunday 24 May 2009 11:52:13 Gilles Caulier wrote:
> Other, point is the size of thumbs : OpenDesktop spec said that normal
> and large thumbs must be generated (128x128, 256x256). If i'm not too
> wrong digiKam only generate 256x256. This can be the issue of your
> problem.

This explains much!

I did some tests and this is result:

https://bugs.kde.org/show_bug.cgi?id=193967

With simple patch loading of thumbnails is much, much faster. Of course it
comes with price - slightly lower quality of thumbs (but only on display,
generated thumbnails are of good quality).

It is done by simple change from SmoothTranformation to FastTransformation.

I understand that this trade off isn't good for everyone but digiKam 
experience
becomes much smoother after removing of Smooth transformation ;)

Several possible solutions:
- use that patch as is and accept slightly lower quality (really visible only
with smallest thumbnails of 80px - and really, who could expect super quality
from those thumbs ;)
- make option in config dialog a) lower quality of thumbs, faster loading b)
high quality of thumbs, slower browsing of albums
- load thumbnails in two passes: first time with FastTransformation, second,
after eg. 2-3 seconds of inactivity with Smooth transformation