Pixel aspect ratio is often confused with different types of image aspect ratios; the ratio of the image width and height. However, some imaging systems, especially those that must be compatible with standard-definition television motion pictures, display an image as a grid of rectangular pixels, in which the pixel width and height are different. An example of such effects would be radial blur, motion blur, or even a simple image rotation. Motion picture film formats. PAL pixel aspect ratios for standard and anamorphic wide screen , respectively and , were awkward for digital image processing, especially for mixing PAL and NTSC video clips. There are several complicating factors in understanding PAR, particularly as it pertains to digitization of analog video:. Digital video frames are generally defined as a grid of pixels used to present each sequential image. Use of pixel aspect ratio mostly involves pictures pertaining to standard-definition television and some other exceptional cases. Pixel aspect ratio must be taken into consideration by video editing software products that edit video files with non-square pixels, especially when mixing video clips with different pixel aspect ratios.
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