If I could upload photos, I would show you just how easy it is to change this blue cham back to green (or any other color combination you desire).
The red and magenta channels are virtually non-existent, the green appears to be severely tampered with (as in reduced unnaturally), and yet the cyan and blue channels remain very strong and clean. The channels hardly overlap as well, which tells us that they have been severely modified from their original form. The most obvious flaw (to the naked eye of the average viewer) is that the underside of the branch is glowing blue, which a very unnatural color for most flora.
Filters may have been used, but it would have been unnecessary to do so. A novice could have made (and did make) these changes in under 5 minutes digitally.
A blue color phase may well exist. but this photo's hue and saturation integrity have been completely ruined with over-editing; something you would most likely not want to do when photographing a super-rare blue jackson's chameleon. Since none of us have ever heard of a blue jackson's, and as this photo represents nothing more than the concept of a blue jackson's and is evidentially worthless, it is safe to say that this photo is, beyond all reasonable doubt, a fake.
To summarize with a quotation from Anonymous: "I can tell by some of the pixels and from seeing a number of shops in my time."
Stoic
