You can use the createWindow method of the canvas also. This script detects and sizes the window and textbox automatically, just feed it a jpg image on the commandline.
#!/usr/bin/perl
use warnings;
use strict;
use Tk;
use Tk::JPEG;
use Image::Magick;
my $im = Image::Magick->new;
my $image = shift || '2uni2.jpg';
my ($width, $height, $size, $format) = $im->Ping($image);
my $mw = MainWindow->new();
my $canv = $mw->Canvas(-bg => 'lightsteelblue',
-relief => 'sunken',
-width => $width,
-height => $height)->pack(-expand => 1, -fill => 'both');
my $img = $mw->Photo(-file => $image );
$canv->createImage( 0, 0, -image => $img, -anchor => 'nw' );
my $text = $mw->Scrolled('Text',
-bg=>'white',
-scrollbars=>'osoe',
);
my $textcontainer = $canv->createWindow(
$width/2, $height/2, # default anchor is center
-window => $text,
-width => $width -200,
-height => $height-200,
-state => 'normal');
$text->focus;
MainLoop();
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