TOPIC
Is the video captured on a Macintosh, using an Apple video in solution, interlaced or non-interlaced?
DISCUSSION An interlaced image is an NTSC 525 line frame which is separated into two sequential scans, or fields, of 262.5 lines each. Field one scans the odd numbered lines and field two scans the even numbered lines creating two interlaced images per frame. The process results in 60 fields per second and is used to enhance image clarity as well as to reduce the flickering which is apparent when the eye is presented with 30 images per second. The quality of a captured frame, or fields captured, differs between Macintosh models. The Power Macintosh G3 and those systems that utilize the Apple Video System video-in card, such as the Power Macintosh/Performa 5xx/6xx/5200/5300/5400/5500/62xx/63xx/ 6400 and 6500 series computers capture only 30 fields/second which results in a non-interlaced image. Other Macintosh systems with video-in features, such as the Quadra 660AV, 840AV, and Power Macintosh 6100/7100/7200/7300/7500/7600/8500 and 8600, all capture at 60 fields/second which results in an interlaced image If a user wishes to capture interlaced video on one of the systems not equipped for interlaced video capture, they would have to add an additional video capture card to achieve this quality. Companies like ATI, Avid, IxMicro, Radius, Media, iWonder, and Pinnacle all offer video capture solutions capable of capturing video at 60 fields/second. |
| Document Information | |
| Product Area: | Apple Software; Peripherals |
| Category: | Video |
| Sub Category: | General Topics |
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