[brucethemoose2]

Some examples:

- Changing the style of the whole photo to (for instance) make it look old and analog.

- "Enhancing" it with HDR, depth of field, focus everywhere or something like that.

- Altering exposure beyond what you could get out of a underexposed/overexposed RAW file.

- Stylizing the human subjects to make them look more attractive, more grimey or whatever

All these things could arguably be done in photoshop, but its just very labor intensive and more hit-or-miss. Hence the contest rules would have to exclude most photoshop work if they want to exclude diffusion.