What is HD?
High-Definition is the top of the line, all digital format for broadcasting and viewing TV programming. With HD, you see images at a higher resolution than you have ever viewed on a home screen before. This clarity is delivered in a crystal clear, widescreen format, with CD quality sound: as if a movie theater was dropped in your living room. HD is the future available today. ABC will not charge you to receive the improved quality high definition programming, but you will need a TV capable of displaying high definition signals.
HD or High Definition, as it is used in reference to HDTV, HDV, HD Editing, and Blu-ray discs, refers to image resolution. Image resolution describes the level of detail an image holds. It is quantified by how close lines can be to each other and still be distinguished as separate. In digital imaging, the image resolution is referred to as the pixel count. A pixel is simply a picture element or a single point in a graphic. Below is an illustration taken from wikipedia.org that shows how the same image might appear at different pixel resolutions. HD vs SD HD has at least twice the linear resolution of SD (Standard Definition). This allows much more detail to be shown on an HDTV, and Blu-ray disc then with an SD television (SDTV) and regular DVD. In addition, all HD images are captured in a 16:9 aspect ratio, which allows an increase in effective resolution without letter boxing or anamorphic stretching. The illustration below was taken from wikipedia.org and shows the simple difference
HD refers to High-definition video which has more lines of resolution and generally looks more beauteous than standard video. HD video on Flickr is 720p (just like HDTV) which means that there are 720 horizontal lines of resolution in the video. That’s it! Nothing too fancy, it basically just means higher quality video. A quick technical note: Because we show HD in 720p, if you are shooting video that is interlaced it is a good idea to de-interlace it first.
HD (high definition) is the latest in a long line of major improvements in television technology, which has moved from black-and-white analogue to widescreen colour digital over the last 50 years. HD gives you exceptionally clear, crisp pictures with vivid colours and up to five times more detail than standard definition.
