wiki:ServeDynamicImage
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Last modified 13 years ago
    @expose() 
    def captcha(self,**data): 
        myImage = ImageGenerator() 
        cherrypy.response.headerMap['Content-Type'] = 'image/jpeg' 
        return myImage.to_string('jpeg','RGB')

based on myImage being a PIL image object, using PIL's to_string() function