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The term post-processing (or postproc for short) is used in the video and film industry for quality-improvement image processing (specifically digital image processing) methods used in video playback devices, such as stand-alone DVD-Video players; video playing software; and transcoding software. It is also commonly used in real-time 3D rendering (such as in video games) to add additional effects.

Uses in video production

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Video post-processing is the process of changing the perceived quality of a video on playback (done after the decoding process). Image scaling routines such as linear interpolation, bilinear interpolation, or cubic interpolation can for example be performed when increasing the size of images; this involves either subsampling (reducing or shrinking an image) or zooming (enlarging an image). This helps reduce or hide image artifacts and flaws in the original film material. Post-processing always involves a trade-off between speed, smoothness and sharpness.

Uses in 3D rendering

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Additionally, post-processing is commonly used in 3D rendering, especially for video games. Instead of rendering 3D objects directly to the display, the scene is first rendered to a buffer in the memory of the video card. Pixel shaders and optionally vertex shaders are then used to apply post-processing filters to the image buffer before displaying it to the screen. Some post-processing effects also require multiple-passes, gamma inputs, vertex manipulation, and depth buffer access. Post-processing allows effects to be used that require awareness of the entire image (since normally each 3D object is rendered in isolation). Such effects include:

See also

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References

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  1. ^ "Aggregate G-Buffer Anti-Aliasing". Archived from the original on 2016-04-27. Retrieved 2016-01-16.
  2. ^ "//game dev log of martins upitis: GLSL Cubic Lens Distortion". October 13, 2011. {{cite web}}: External link in |title= (help)
  3. ^ "john-chapman-graphics: Pseudo Lens Flare". February 22, 2013.
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📚 Artikel Terkait di Wikipedia

Post-processing

Look up post processing or postprocessing in Wiktionary, the free dictionary. Post-processing may refer to: Image editing in photography Audio editing

Miniature faking

be done either optically when the photograph is taken, or by digital postprocessing. Many diorama effect photographs are taken from a high angle to simulate

Soap opera effect

a public service announcement describing the motion effect and how postprocessing induces it; this has received endorsements from industry peers like

Chroma key

key colour, which would not be replaced by background image during postprocessing. For Star Trek: The Next Generation, an ultraviolet light matting process

Libavcodec

DirectShow filter and adds postprocessing to improve image quality; once installed, it is automatically used by all Windows DirectShow video players, such as Windows

RIVA TNT2

depth. This is dithered down for the 16-bit framebuffer, which is then postprocessed by a 2x2 box filter in the RAMDAC, dubbed "22-bit equivalent" output

Dr.Fill

amount of lookahead, limited discrepancy search, and postprocessing. Ginsberg remarks that postprocessing was chosen over branch and bound because the two

Intel Graphics Technology

and 4000 include hardware video encoding and HD postprocessing effects. For some low-power mobile CPUs there is limited video decoding support, while none