[gentoo-user] Your opinion on jpeg encoders, please

[Frank Steinmetzger <Warp_7@gmx.de>]

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Hi all,

this is not really a Gentoo-specific question, but some of you know your way
around stuff, so here goes.

When I edit photos, I like to shrink and recompress them to save on space,
but not mangle them too much in the process to lose quality. So for average
images I tend to use a quality setting between 80 and 86, very bad shots
such as defocussed or blurred ones just 70. And for the really good ones
(crystal sharp, portraits, extraordinary motives etc) 90 and more.

In the far past I’ve been using Gimp, but for some years now mostly Showfoto
(the editor from Digikam) due to its more useful photo enhancement features.

However I noticed that the latter procuces larger files for the same quality
setting. So currently, I first save with a very high setting from Showfoto
and then recompress the whole directory in a one-line-loop using
imagemagick’s convert. I have the impression that it produces far smaller
files at the same visual quality.


Now I know that one can’t fully compare quality settings of different
encoders, but it started me wondering: which is really “better”? Or maybe
just a little more enhanced, or up-to-date from an algorithmic standpoint?

Just because many distros and tools use libjpeg, that doesn’t mean it’s the
best one out there. Gimp, showfoto and convert use different encoders,
because compressing the same PNG with the same JPEG setting does not result
in three identical files.

Does any of you have an opinion on that matter?
Cheers.

-- 
Gruß | Greetings | Qapla’
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