Our Rendering functionality relies on GDI+. GDI provides the fastest way to process text (measuring, splitting, aligning, etc.), which is essential to our product. In the Windows environment .Net runtime manages to resolve the GDI+ calls issued by System.Drawing.Common package natively. Unfortunately, Azure Functions do not support these calls by design. I'm afraid, we cannot provide a workaround or a fix, because we cannot control Azure Functions sandbox.
The option is to use another Azure plan - for example, Basic and higher App Service plans. Even these implementations have some GDI API restrictions that affect the image rendering.
You may test also our Azure demo.
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