Probably nothing in video editing causes more confusion than working with still images. Whether prepping scans of images for a video montage, or exporting still images from Final Cut for use on the Web, stills are a mess.
This is all due to the sad fact that computers display their images as a collection of square pixels, whereas video displays the images using a wide variety of rectangular pixels (see Fig. 6.1). Even in HD, there's no consistency in pixel shape. Some formats, like RED or HDCAM SR, use square pixels. Other formats, like HDV, use a variety of differently shaped rectangles. Consequently, the pixel shapes don't match between computer and video images.
Sigh … its enough to drive us all nuts.
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