I am stuck on trying to preview images that are uploaded from a html form.

<form method="POST" action="py_save_new_image" enctype="multipart/form-data">
<input type="file"  name="file">
<input type="submit" name="save" value="Upload">

When the form is submited it sends it to a python script that gets the image and sends it to another page to be previewed. Problem is, I receive and error that the image cannot be displayed.

My python script is below.

    if content_type.find('image')!=-1:
        context.REQUEST.RESPONSE.setHeader('Content-Type', 'image/jpg')
        img = file.read()
print context.dtml_select_new_image(context, context.REQUEST, image=img)
        return printed
        return "error"

I load the image in a dtml method with:
<dtml-var image>
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