Specifies the source of the image. It can be either a scanned image, or a photograph created with a digital camera. Special preprocessing operations can be performed with the image depending on the selected source. For example, the system can automatically correct distorted text lines, poor focus and lighting on photos.
The value of this parameter can be one of the following:
The image source is detected automatically.
In Pega, where these PDF files are stored. Is it in db table or server path like temp directory?
If the file are fetched from Pega table, it may be in binary format, are you doing any other conversion apart from base64?
Are you able to share failed request and response from tracer?