-
settings for positive and negative parallax
different sources come up with totally different explanations and values! for the settings for positive and negative parallax. I’ve got a screen of 44.1 inch.
Steve Shaw has an explanation in which the parallax is related to screen size in https://3droundabout.com/tag/the-basics-of-shooting-stereoscopic-3d : parallax for a given screen size:Human interocular (~2.5″) divided by the screen width, with the result multiplied by the number of horizontal pixels.
So, for my screen: (2.5/44.1)x1920 = 109 pixels for maximum positive parallax. Other sources use percentages: maximum 2% for maximum positive parallax; that’s 2% of 1920 = 39 pixels. There’s a lot of difference between the two. Or what am I doing wrong?
regards
Hans -
1 Reply
-
I think you’re following the formula as outlined, but you’re running up against the limitations of the Steve Shaw’s understanding of 3D: as you said, there is a lot of conflicting information out there. The biggest problem with following the advice of someone like Shaw, who is a new 3D practitioner, is that his optic system has adapted to handle A LOT of parallax [it happens to all of us as we expose ourselves to a variety of 3D films and shorts].
I’ve focused the last 4 months on using the second formula you mentioned. And now in my experience I’ve come to believe that ~2% positive combined with ~1% negative for a net deviation of no more than ~3.33% will always yield a pleasant result – on any size screen. To lend credibility to my claim I will also mention that this is precisely why Sky 3D requires that all new content adhere to this standard.
So, ~2% positive + ~1% negative = the Holy Trinity of 3D: 3.33%
Idiot Savant… ok, maybe just Idiot
https://seth.savant-studios.com
Reply to this Discussion! Login or Sign Up