 Perception sometimes justifies our beliefs. If you see that it is raining outside, this may justify your belief that it is raining outside. And much of what we know is based on perception. But how about mental imagery? Can mental imagery justify our beliefs? There are two related, but independent questions here. The first one is about whether mental imagery could ever be a source of knowledge or even new information. And the second one is about reliability: if perception is colored by mental imagery, should this give us a more complex picture of perceptual justification?