Re: EXIF support in PNG

On Wed, Jan 4, 2017 at 2:03 PM, Willem van Schaik <[email protected]> wrote:
> But are we agreeing on no compression, no header?

I interpreted Cosmin's repsonse as meaning that it was a little more
difficult than three lines of code, so he would have to spend some
time to work it out.

In fact exiftool is written in perl, using, I think, libexif (though
my perl is nowhere near good enough to immediately tell).   So I will
patch 'exif' - the application written by the writers of libexif,
which, like libexif hasn't been updated for many years.

I'm also writing a jpegtopng converter from scratch; that makes it
much easier to distribute an example program for the encode side.
'exif' only *decodes* (unlike exiftool).  It won't compress the eXIf,
but since it has to compress the PNG image itself my version of the
compression code will be there (but it's not simple; it will be the
most complex thing in the program!)

John Bowler <[email protected]>

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