[Therion] Progressive coded JPG files??

[Olly Betts]

On Mon, Aug 25, 2025 at 10:10:32AM -0500, Bill Gee wrote:
> According to this, specifying "-file $ffname" will load the image using
> whatever format handler is registered for that type.  Tk includes by default
> handlers for GIF and PPM/PGM formats.  That is why PNG images still work.

Note PNG is a completely different format to PPM/PGM (and also to GIF).

AIUI it you need tkimg to get support for both PNG and JPG.

> So what is the deal?  What does wish really do?  Did the set of default
> image handlers change between wish 8.6 and 9.0?

"wish" is a windowing Tcl shell.

My guess is you have tkimg installed for Tcl 8.6 but not for 9.0 (like
how you had bwidget installed for 9.0 but not 8.6 until you hacked
around that by adding a symlink),

Cheers,
    Olly