Wednesday, May 7, 2014

HA1_Task 1

Glossary:

Pixel: pixel is a physical point in a raster image, or the smallest element in a display. This means its the smallest controllable element within a picture. These pixels contain color and they are square. These pixels all come together to create a picture. Each pixel is only one color and there are so many of them, thousands or millions that it creates a picture.

Resolution: Resolution refers to the clearness and sharpness of the image or video, this is often used to determinant a camera or screens worth.. The more pixels there are in an image, the more detail the image is, as long as its on a high pixel screen. but the same if it has low pixels.

Screen ratios: The rations within a screen basically mean the width and height proportion. This just gives us the size of the image and maybe the surface area.

Frame rate:  Frame rate tells us the speed that the clip changes from one picture to another. This is because the brain can only visualize 10-12 frames per second, so if you put more in it gives it a sort of fluid/motion movement. thus making a moving picture. But the closer you are to the brains functional use of frames the jerkier motion the video is.


Video formats: The different formats in video means that you can record differently, changing the outcome of the video. Some of these are; Frame rate, Exposure, Pixel aspect ratio, frame size and scanning method. As you can see this only changes the [frame]'s This is because on a camera you cant change much else. That is why you need to transfer te files onto a computer for furter editing.


Video compression: Codec is short for coder-decoder and describes he method which the video data is encoded into a files and then decoded when the file is played back. Majority of videos are compressed during encoding and so the terms codec and compressor are often used. Transcoding is the term used for the process of converting from one codec to another. Codecs can be Lossless, which means they do not throw any data away, or Lossy, which means that some data is lost during encoding. Lossless codecs are  of higher quality than lossy codecs, however they produce larger files.































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