PerspectivePositioner

PerspectivePositioner removes perspective distortion from a selected plane. Place its points on a screen, poster or another flat region in the incoming image; the result becomes a rectangular view for texture-style editing. Use CornerPositioner to place a new image into a screen.

Top Left, Top Right, Bottom Left and Bottom Right identify the chosen source region. They are not four new destinations for an inserted layer. Moving points while viewing only the unpinned output can obscure their relationship to the real plane; compare with the input.

Perspective mapping models a flat plane’s perspective transform. Bi-Linear remains for older-project compatibility and can distribute interior details differently. The current Blackmagic instructions recommend Perspective; assess the choice using a grid and straight lines.

Coordinates are normalized to the frame: X increases left to right and Y bottom to top. Values 0/1 identify the edges, with 0.5/0.5 at the center. Match image size, pixel aspect and orientation when transferring coordinates from another application.

The node does not find motion automatically. A moving plane needs consistent corner keys or external tracking data. One static quadrilateral will not follow camera motion; deforming cloth and strong lens distortion are also not described by one plane.

PerspectivePositioner and CornerPositioner do not concatenate into one resampling operation. Even with matching corners, the round trip can soften detail. For a local edit, repin through CornerPositioner and limit compositing over the original with an external Merge.