images in Perl/Tk

["mick.crane" <mick.crane@gmail.com>]

I try to load images with Perl/Tk but there is message,
"couldn't recognize data in image file "test.jpeg" at 
/usr/lib/x86_64-linux-gnu/perl5/5.38/Tk/Image.pm line 21"
I've tried different images/pngs/jpgs with same error.
images load OK in other viewers.
Installed tkpng with apt.

Anybody successfully used images with Perl/Tk?
Would Tk::JPEG/Tk::PNG from cpan be happy with the Debian Tk and may 
possibly help recognise the file format?
Or is there some 'pruning' of the images, made with Gimp, needed to work 
with Tk?

mick