[cl-gd-devel] PNG compression

[Andrei Stebakov]

Thank you, Hans. Looks like I need to contact libgd folks to learn more
about this type of operation.

Andrew

On Thu, Oct 2, 2008 at 11:28 AM, Hans Hübner <hans at huebner.org> wrote:

> 2008/10/2 Andrei Stebakov <lispercat at gmail.com>:
> > Yes, it works.
> > The scenario that I have is like this:
> > I am trying to down-size a png image so I
> >
> > open it with with-image-from-file
> > copy resized image (copy-image old-image new-image ....)
> > save it  (write-image-to-file new-image-file-name :image new-image
> > :compression-level 5)
> >
> > In my case :compression-level doesn't change the size of the output
> image.
> > Probably it happens because the original file that I am trying to re-size
> is
> > already compressed to the maximum.
>
> I fear I don't know enough about PNG compression to say anything
> profound here.  I do suspect that it is a general GD issue rather than
> a cl-gd problem, so maybe asking on some GD support channel would be
> helpful?  You'd propably need to supply the image in question to have
> someone comment on what compression you can expect.
>
> -Hans
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