optimize/compress screenshots for docbook handbook

[Gilles Caulier]

Hi,

Look at my script used in the older version of digiKam handbook based
on docbook :

https://invent.kde.org/documentation/digikam-doc/-/blob/v7.9.0/project/optpng.sh?ref_type=tags

Note: now with digiKam manual based on Sphynx, we use Webp and it's so
far better for the file size than PNG.

Best

Gilles Caulier

Le ven. 30 mai 2025 à 07:28, Yuri Chornoivan <yurchor at ukr.net> a écrit :
>
> El dijous, 29 de maig del 2025, a les 22:59:55 (Hora d’estiu d’Europa
> central), Jack va escriure:
> > (I recently asked this on IRC, but Konversation crashed before I saw
> > any response, so apologies if this is actually a duplicate request.)
> >
> > I'm currently capturing screenshots for the handbook for the new
> > version of KMyMoney.  I recall the last time I did this (years ago)
> > there was a tool (or more than one?) for optimizing/compressing the png
> > files, but I can't currently find any mention of such beyond the simple
> > basics of capturing screenshots.
>
> optipng (i'm sure there's more, search in you favorite search engine for
> optinpng alternative for linux or something)
>
> Cheers,
>   Albert
>
> >
> > Thanks for any pointers to any fine manual I seem to have missed
> > reading.
> >
> > Jack
>
> Hi,
>
> Personally, I use pngnq/advpng like this:
>
> #!/bin/sh
>
> for i in *.png
> do
>      pngnq -s 1 "$i" && advpng -z4 "${i%.*}-nq8.png" && mv -f "${i%.*}-
> nq8.png" "$i"
> done
>
> Hope this helps.
>
> Best regards,
> Yuri
>
>