First the arrangement, and apologies if you already know this. The image should be sent over the wire in response to a separate HTTP request. Your generated HTML should just include an IMG tag (or have Javascript that writes an IMG tag on demand); the browser, seeing this, will make the request for the image.

Now, the above means that you can basically point your browser to the URL given in the first page, and expect to receive an image/png response containing your image. So do just that: request the image manually. Look at the HTTP headers. One of them should contain the Content-type, before the double newline separator. If you have LWP installed, you can use GET -U http://... on the command line to examine the headers. Post the header here if you spot no problems.

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