The HD Difference
Standard definition widescreen video is captured at 720 x 480 pixels, while high definition is captured at 1440 x 1080 pixels.
Copyright Nick Bowie 2007
Instead of 480 lines of vertical resolution there are 1080. Thats 500% more pixels in the whole HD image.
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Original Size of Standard Definiton
Original Size of High Definition
2 Megapixels