Is there a naming conventions for images in Wordpress like in Tumblr?

I am building an RSS Reader that can extract the version of images with the highest available resolution. Some feeds link to the low-res image, despite the high-res being available.

Tumblr names different versions as "_1280.jpg" and "_500.jpg". So, the reader can search for the high-res, knowing the low-res name.

Is there a rule also on Wordpress?

Thanks!