Autodesk 64006-051108-9001 User Guide - Page 274

266 Glossary PICT - still image file format developed by Apple Computer. PICT files can contain both vector images and bitmap images, as well as text, and an alpha channel. PICT is a ubiquitous image format on Mac OS and can be read and displayed by QuickTime. Pixel - one dot in a video or still image. A very low-resolution computer screen is 640 pixels wide and 480 pixels tall. Digital video movies are often 320 pixels wide and 240 pixels tall. Pixel Ratio - used by MPEG-1, a comparison of a pixel's vertical measurement to its horizontal measurement. A ratio of 1 is a square pixel. Numbers greater than one produce narrow pixels and less than one produce wide pixels. Technically, the pixel ratio is the horizontal distance between the centers of 2 adjacent horizontal pixels divided by the vertical distance between 2 adjacent vertical pixels. Pixelization - when the pixels that make up an image get exaggerated or enlarged. Makes the image look chunky or jagged and is a compression artifact. Play - EventStream event that plays a movie at a specified time. Only works as an action associated with a Hotspot. PNG (Portable Network Graphics) - pronounced "ping," a bitmap still image format designed to replace GIF. PNG is completely patent- and license-free and is superior to GIF in many respects. PNG is also a QuickTime codec. Premiere Export Module - see Export Module. Progressive Streaming - term referring to online media that viewers can watch as it downloads onto their computer. Also called progressive download. Progressive streaming files don't adjust to match the bandwidth of the viewer's connection like a realtime-streaming format. QuickTime's fast start feature is a progressive streaming technology. Also called HTTP Streaming because standard HTTP servers can deliver progressive-streaming files.