Re: fixing PNG images

[David Kastrup]

Werner LEMBERG <address@hidden> writes:

> I've just been bitten by the following libpng `feature':
>
>   IDAT: invalid distance too far back
>
> (file `lily-ledger.png', while being processed by pdftex).
> Apparently, libpng 1.6.x no longer accepts PNG images with this
> problem out of the box.
>
> Note that libpng comes with a tool called `png-fix-too-far-back' to
> fix such errors in PNG files.  Is it OK to update all PNG files in the
> lilypond repository?  I've been able to successfully continue
> compilation with the current SVN TeXlive binaries after running this
> program on all PNG images.

How did the problematic PNG files come about?

-- 
David Kastrup