Perspective Positioner Node

Perspective Positioner lets you extract a rectangular element seen in perspective (sign, screen, book on a table) and straighten it into a fully frontal view. Place the 4 corners on the corners of the element in the shot → the element is "unwarped" into a flat rectangular image.

Used before operations that need a flat view (precise roto, paint, text touch-ups) and usually followed by a Corner Positioner to put the perspective back on the result.

• Effects Library: Tools > Warp > Perspective Positioner
• Quick add: right-click in the Node Editor → Add Tool > Warp > Perspective Positioner

Corner Positioner

Applies a perspective: takes a flat image and warps it to match 4 corners in perspective.

Perspective Positioner

Removes a perspective: takes an image in perspective and "unfolds" it into a flat front view.

Important note: these two nodes do not concatenate. Each pass introduces resampling, and therefore slight softening. Only use them when needed.

• Input (orange) - the 2D image holding the element in perspective to straighten.
• Effect Mask (blue) - optional. Limits the transformation to a specific area.

Unfold → edit → refold workflow:
MediaIn → Perspective Positioner (4 corners on the element)
       → edit (Paint, Text+, Color Corrector) on the flat image
       → Corner Positioner (matched 4 corners) → Merge over MediaIn
       → MediaOut

Flatten a document photographed at an angle:
Document photo → Perspective Positioner (4 corners of the document)
              → readable flat image of the document
              → MediaOut

With a Planar Tracker for animation:
Planar Tracker → Perspective Positioner → edit
              → Corner Positioner (inverse track) → Merge

Mapping Type

Perspective (recommended): correct perspective calculation. Bi-Linear: simpler but less accurate with strong perspective.

Corners X / Y (4 points)

Position of the 4 corners matching the 4 corners of the element in the source (Top Left, Top Right, Bottom Left, Bottom Right). Can be moved in the viewer or through the Inspector.

Top / Bottom / Left / Right

Alternative controls in the Inspector to fine-tune the positions.

Output Size

Output resolution of the straightened image. By default it matches the original frame, but it can be adjusted.

1. Perspective Positioner: place the 4 corners on the 4 corners of the element in the source shot (sign, screen, etc.). The element becomes a flat rectangle.
2. Edit on the flat view: Paint for touch-ups, Text+ to replace text, Color Corrector for localized grading. Much easier on a front view.
3. Corner Positioner downstream, with the 4 corners inverted (or a copy of the Perspective Positioner positions). Puts the perspective back.
4. Merge over the original shot - the edited element replaces the original while keeping its natural perspective.

Tip: connect the 4 corners of both nodes to the same Tracker (or Planar Tracker) = the whole workflow follows the movement automatically.

• Extracting a sign for replacement - a billboard filmed at an angle → Perspective Positioner → flat touch-up → Corner Positioner to reinsert it.
• Document photographed at an angle - a photo of a book page taken at an angle → Perspective Positioner = a readable flat view of the document.
• TV screen / monitor - extract the content of a screen filmed in a scene to edit it and then put it back.
• Precise roto of a planar element - roto of a table or a floor in perspective: unwarp it first, roto on the flat view, then rewarp it = more precise roto.
• Texture scan from a slanted surface - a photo of a textured wall or floor taken at an angle → unwarp it to get a tile texture you can use directly in 3D.
• Artistic animated wobble effect - animate the 4 corners of the Perspective Positioner = a moving unwarp effect = psychedelic looks.

• Perspective Mapping by default - clearly more realistic than Bi-Linear for shots in true perspective.
• Zoom in for precise placement - the 4 corners must sit exactly on the corners of the element in the source shot. Imprecision = a distorted unwarp.
• Perspective + Corner as a pair - for the extract/edit/reinsert workflow, the 4 corners of both nodes must be identical (same positions). Copy and paste the parameters.
• Two passes = softening - the two nodes do not concatenate. Each pass introduces slight resampling. Keep their use to a minimum if quality comes first.
• Connect to the same Trackers for automatic animation: 4 trackers on the corners of the element → Perspective Positioner (extract corners) + Corner Positioner (rewarp corners), all linked.
• Output Size for quality - if the extracted element is small in the source shot, raise the Output Size to get a high-resolution flat view to edit.
• For complex tracking workflows (a moving element in perspective), prefer a Planar Tracker directly with its Corner Pin mode - it does the same thing in a single node.