We downloaded the demo project before removing it. In future, we kindly ask you to post projects through the support ticketing system to avoid publishing DEV assemblies publicly.
Thank you for your understanding.
About your question, there is an issue on exporting an image in JPEG format through the Reporting REST service. The issue is forwarded to our development team for further investigation and your Telerik points are updated to thank you for bringing our attention to the issue.
The OutputFormat can be specified as deviceInfo passed to the ReportProcessor instance.
Let us know if we can be of any further help for you.
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