I doubt the images were manipulated by photoshop (except for the inversion pic of course, you have to use SOME type of proggie to invert it) since he clearly points out which image this is that's available from the Mars image library. Here's the Link. All he did was blow it up and invert it. You can tell from the original image that it's kind of strange what process could create such uniform shapes over an area that size.
SALVAGED FROM THE WAYBACK MACHINE:Back in 1995 I was working for a company developing interactive CD-ROMs. While I was "beta testing" a CD (see below) entitled 'In-Terra-Active' (it was about physical geology) in the section dealing with planetary geology & evidence of water, they had this picture illustrating evidence of channels on Mars. But then I saw it, it's another Mars face. It says the photo is somewhere just north of the Martian equator.
I've been waiting for someone else to find this but it seems no one will (and time is running out). I've searched through hundreds of photos from NASA, JPL, MSS, etc. and I can't find this image. I'm not looking for publicity nor credit, I just can't keep this to myself, I want RCH to take this and run with it.