[Digikam-users] jpeg compression

Daniel Bauer linux at daniel-bauer.com
Thu Jun 28 17:20:43 BST 2007

On Donnerstag, 28. Juni 2007, Bjørn Kvisli wrote:

> If I understand this right, assuming that the Kodac C340 uses jpeg quality
> of 70 internally, it makes no sense to set a higher value in Digikam?

it still makes sense, because every new save looses some more information. 
Although its not that dramatic in reality, you could think of percents just 
to better understand: then if you save the 70% with 100% you get 70% again, 
if you save it with 70% you get only 49% (70% of 70%) and so on.

I found that a jpg value of 88 in digiKam gives approx. same results as 80 in 
photoshop (in quality and size). That's the value I use for my web pics.

However, as long as you work with the pictures better use a lossless file 
format and only save the final pictures to .jpg (if at all). And leave the 
originals untouched.

kind regards

Daniel Bauer photographer Basel Switzerland
professional photography: http://www.daniel-bauer.com
erotic art photos: http://www.bauer-nudes.com/en/linux.html
Madagascar special: http://www.sanic.ch

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