In Resizer v2, the CDN automatically evaluates the client's capabilities and provides the most efficient supported format.
https://dev.arcxp.com/photo-center/image-resizer/resizer-v2-how-to-transform-images/
However, when using the service for distribution to external services rather than a website, there may be cases where you want to explicitly specify the image format due to the constraints of the destination system.
Currently, the receiving side can specify JPEG images by setting the HTTP header to “Accept: image/jpeg,” but the sending side cannot specify the format.
To clarify the format on the sending side (i.e., us), we would like to be able to specify the image format by appending a query parameter to the image URL, similar to how image size is specified.
Masaki Kitamura
Thank you for the idea, I have added this request to our idea backlog.