Photoshop :: Displace Filter Alternative Implementation?

Oct 4, 2012

In my work I am using Displace (Filter>distort>displace) filter to create fake parallax shift, to create stereograms. I make two copies of image- one using positive-value horizontal displace filter, the other negative. When viewing those images as stereoscopy pair, you perceive them as projected on 3D surface defined by grayscale displacement map (a.k.a. depth-map).
 
My problem is highly specific: I need to be able to precisely control which pixels are displaced and by what ammount (ammount defined by greyscale value of map pixels). Current implementation of displace filter makes if very difficult.
 
My goal is this: every pixel of image will be shifted left or right by distance defined by greyscale value of directly underlying depth-map pixel.
 
The way actual displacement filter works can be described as such: If depth-map pixel is <50%grey, it 'fetches' and becomes bitmap pixel from left. If depth-map pixel is >50%grey, it 'fetches' and becomes bitmap pixel from right.As a result-I cannot, by comparing image pixels with underlying depth-map pixels predict what distance will given image pixel travel. Shift distance is not defined by directly underlying dept-map pixel. Instead, image pixel is 'fetched' by undefined depth-map pixel.
 
I realise it is highly specific requirement without an easy answer. I am willing to spend long time working on software side if need be and learn in process. I am becoming quite proficient in scripting (JavaScript). I need to know where to start and if there is a solution simpler than coding new filter from scratch.I am using Photoshop CS6 and work cross-platform (primarily windows).

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Title reflects what i think i need to use. What i want to do is bend an image to fit within the line drawing below see images attached.

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There seem to be some errors in the code for Modify > Convert > Displacement to Polygons with History. My scene uses an animated displacement map, coming from an image sequence. The displacement works as advertised, but I keep getting execution errors. Here is the code for the offending expression, which was created silently when I issued the conversion command:

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The error messages are annoying, but I can live with that. The real problem comes when I try to select keyframes in the timeline. I shift-drag across keys to select them, and they highlight at first, but then the highlighting immediately goes away. I am forced to use the Dope Sheet instead. Disabling expressions doesn't work, so I don't know if this problem is related to the displacement expression or not.

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