Image standards

Gianluca Sforna giallu at gmail.com
Tue May 22 22:09:59 UTC 2007


On 5/22/07, Toshio Kuratomi <a.badger at gmail.com> wrote:
> On Tue, 2007-05-22 at 13:45 -0500, Mike McGrath wrote:
> > Anyone have a problem with us using SVG for image sources and PNG for
> > final copies on our websites?  We can grandfather this in but mizmo
> > suggested it on the websites-list.  I think its a good idea.
>
> It depends on what is meant by "image".  png and jpeg have vastly
> different compression characteristics.  Using jpeg where appropriate can
> save someone on dialup a tremendous amount of time.  However, many of
> the images we create as SVG are going to be the kind that store well as
> png...

Sure, but often images are converted to 24bit png even when that is
not needed. I suggest (if not already done) using ImageMagick and a
recipe like:

convert -quality 0 +dither -colors 256 infile.png out.png

whenever possible to maximize the gains of compression

HTH

Gianluca




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