I'll quote the Product description here, in case it gets changed later, as has happened on numerous web pages including the publisher's:
With artful composition and controlled framing--but no digital manipulation--Edgar Martins creates sublimely beautiful views of often un-beautiful sites.
***"No digital manipulation."*** This is how the project was sold to the publisher, and how Martins sold his prints for thousands of dollars. He lied and was caught. Now he's trying to backpedal, and like a child who has fallen and says "I meant to do that!" he is making his lie sound like a grand artistic experiment. Don't fall for it.
No matter how beautiful the images, they represent an ugly lie perpetrated on the very people who supported him. You can easily find the info about this with a simple Google search.
I have nothing against manipulation of images for the sake of art, but lying about it, and indeed building your reputation (and print prices!) on your purist stance, while it's been a lie all along, is shameful and immoral. Martins should return his advance, and the publisher should offer refunds.