hi,

William F Pokorny <ano### [at] anonymousorg> wrote:
> ...
> What particular commands and versions of TCL and Tcllib are you using?

(typed)

% set tcl_version
8.6
% package require crc32
% package require png
% png::addComment foo.png theTag theValue

and using a 'tcllib1.18' (though mean to upgrade to 1.19).


> It's been maybe 4-5 years since I played in the tcl/png sandbox but, not
> too long after tcl 8.6 was first released, I found the png support from
> within tcl/tk/tcllib buggy. Supposing you are finding it better?

guess so, cannot recall any problem(s) with 'image' and 'photo' etc.


> I was primarily trying to load/create/modify/save actual image channel
> data but, I don't recall even the particular 'TCL' packages and commands
> I tried at the moment...

fwiw 'df3util' can split PNGs into rgba (and stored in a DF3, but there's the
'export' command).

hope to post a 'compare(1)' image in the next days, showing some/much difference
for the sphere_sweep between 'povr' and stock POV-Ray.  will need to
systematically try with 'sturm' and 'tolerance' etc first though.


regards, jr.

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