How I can see a Raw Image?

It's a simple question. I see people who test games but they do not show fps or something, but people can see the raw images. I tried to poke around the rpcs3. I opened the RSX Debugger and Memory Viewer but did not understand very well, just got black images and errors.

Open the RSX Debugger and spam the PUT/GET buttons. Sometimes you will see something in the usually empty texture window. Then press on that to see the raw texture. Same for the buffers.