1. A method of shared screen verification, comprising: establishing a desktop sharing session between a publisher device and a viewer device, during which the publisher device renders a publisher display and the viewer device renders a viewer display that corresponds to the publisher display; capturing first framebuffer data for a frame of the publisher display; capturing second framebuffer data for a frame of the viewer display, wherein video content of the frame of the viewer display corresponds to video content of the frame of the publisher display; processing the first framebuffer data, the second framebuffer data, or both the first framebuffer data and the second framebuffer data to obtain processed first framebuffer data and processed second framebuffer data that exhibit a consistent display resolution; and comparing the processed second framebuffer data to the processed first framebuffer data to obtain a measure of quality.