On Mon, Jan 4, 2021 at 2:38 PM Frank Steinmetzger <Warp_7@gmx.de> wrote:
>
> 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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>
> What do you call a man with a seagull on his head? – Cliff.