in reply to Display image file in browser
You don't use a function in Perl to display an image file in a browser. If you want to display an image in a browser, you use HTML.
If the image in question must be dynamically generated by a CGI program, then point the src attribute from the img tag at the right program, and have that program output the correct content-type header so the browser knows it's getting an image.
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Seekers of Perl Wisdom