Answers to frequently asked questions about what file formats Scene7 supports, and how it handles various formats.
What is the best format to save a JPGE in Photoshop? What is the difference between Baseline Standard and Baseline Optimized?
Can Scene7 return progressive JPEGs?
Scene7 added support for returning progressive JPEG in 2015. You can use the command fmt=pjpeg for this.
See here for more information: https://marketing.adobe.com/resources/help/en_US/s7/is_ir_api/is_api/http_ref/r_is_http_fmt.html