Are these reflections real or Photoshopped?

Started Aug 16, 2014 | Questions thread
Mark K W Senior Member • Posts: 1,726
Re: if it is artificial, how is it done??

Mark K W wrote:

richardplondon wrote:

How is it done then, taking into account these 3D relative shifts?

By moving around parts of the image that go into the reflection.

I agree it all looks somewhat false and CGI, but I wonder if it is a real reflection made by some liquid he has poured to a surface he has just swept clean, and then he has both touched up e.g. the real sky, as well as emphasised the reflected surface luminosity and clarity/sharpness. Other of his images are also showing that the water is suitably translucent. Also the images all have a very early morning still and day is just starting feel. So - on balance I think he gets up early in the still morning, pours or finds real still liquid on a clean surface, and then tidies it up and emphasises it in post-production.

No. The reflection of the arch can be flipped, transformed a little vertically, and both edges of its curved underside made to overlay those of the real arch perfectly (I've made this experiment). This is impossible in 3D terms, except for two images both produced from the exact same viewpoint. A reflection would have a different virtual viewpoint from where the perspective would have been significantly different.

The shifts are much more complex than 2D transforms… look very very carefully at each one inside my circles - it's not macro shifts of a warped archway, it is down in the very very detailed relative alignment of creases in the clothing vs the lines in the tiles behind, the head relative to the aircon, etc., etc..

There are many examples like that in the detail of this image and his others. Things are moving relative to each other between the real and reflection. It would be such complex masking and transformations to make it all work using a 2D graphical bitmap tool like Photoshop (or any other 2D renderer). Whatever has happened has been 3D, and could only be done with 3D re-rendering (or reaillty!) in my view. That is why I do not get how he has done it.

Other images show many similar effects - throughout. It's not morally reprehensible or dishonest, or anything like that of course - but let's be clear about the nature of these images. The reflections are a trick effect.

Yes - I agree that… my question is more HOW it's done because the 3D relative positional transforms are there on the micro-level.

E.g. could it be two cameras vertically displaced by a small distance and fired at the same time, and then overlay blended in a 2D tool like Photoshop to create a false reflection onto another rendered pool-shape? That kind of thing…

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