Wednesday, 12 August 2015

Re: pretty please can we kill the png optimizer?

On Wed, Aug 12, 2015 at 5:36 AM Martin Pitt <> wrote:
Didier Roche [2015-08-12 12:29 +0200]:
> Le 12/08/2015 12:15, Martin Pitt a écrit :
> >Sebastien Bacher [2015-08-12 12:03 +0200]:
> >>Did anyone measure what difference with/without the png optimizer would
> >>make on the iso/standard install? Without numbers we can't really decide
> >>on the cost/benefit...
> >Back on natty it was ~ 5.5 MB (compressed size) gain with compressing
> >PNGs and 7 MB with compressing SVGs.
> >
> >
> >
> >There is no reason to believe that the numbers would be dramatically
> >different these days, i. e. you can expect a 10 to 15 MB gain on a
> >desktop ISO from this.
> >
> >Martin
> Is that only iso/image size (so recompressed in the squashfs) or the gain of
> an ubuntu install itself, on disk?

As I said, "compressed size", i. e. squashfs/deb difference. PNGs
are already compressed so don't make much difference on an install;
SVGs will get quite a bit bigger uncompressed (but I don't have any


Martin Pitt                        |
Ubuntu Developer (  | Debian Developer  (

On the worst offenders, what about working with upstream to get the png optimizations submitted and accepted?  When this happens set up an environment variable in debian/rules to indicate to skip optimization as it's not necessary.