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A darkroom technician can correct perspective distortion in the printing process. It is usually done by exposing the paper at an angle to the film, with the paper raised toward the part of the image that is larger, therefore not allowing the light from the enlarger to spread as much as the other side of the exposure.
Darktable involves the concept of non-destructive editing, similar to that of some other raw manipulation software. Rather than being immediately applied to raster data of the image, the program keeps the original image data until final rendering at the exporting stage — while parameter adjustments made by a user display in real-time.
Also may mean "Perspective Control" for a lens that has the ability to shift to tilt to control linear perspective in an image. May also stand for personal computer in conjunction with digital photography. PDAF: Phase-detection autofocus. One of the mechanisms of automatic lens focusing. PF: Purple fringing. A form of chromatic aberration in ...
Perspective control: original (left), perspective distortion removed (right). Some image editors allow the user to distort (or "transform") the shape of an image. While this might also be useful for special effects, it is the preferred method of correcting the typical perspective distortion that results from photographs being taken at an ...
Darkroom manipulation is a traditional method of manipulating photographs without the use of computers. Some of the common techniques for darkroom manipulation are dodging, burning , and masking , which though similar conceptually to digital manipulations, involve physical rather than virtual techniques.
Depth of Field for the Tilted Lens (PDF) by Leonard Evens. A more practical and more accessible summary of View Camera Geometry; How to Focus the View Camera by Quang-Tuan Luong. Includes discussion of how to set the plane of focus; The Scheimpflug Principle by Harold Merklinger; Addendum to Focusing the View Camera (PDF) by Harold Merklinger
Using a treadmill is a great way to control your environment while getting comfortable with walking backwards. “With a treadmill, you’re on one stable, moving surface—no random people, curbs ...
Perspective-n-Point [1] is the problem of estimating the pose of a calibrated camera given a set of n 3D points in the world and their corresponding 2D projections in the image. The camera pose consists of 6 degrees-of-freedom (DOF) which are made up of the rotation (roll, pitch, and yaw) and 3D translation of the camera with respect to the world.