This week's topic on Multimedia (images, audio & video) was extremely informative. The area of images caught my attention the most however. It was a relatively simple lesson but now I will be able to tell the difference between Rasper vs. Vector graphics. I've always wondered why some images became pixelated and others did not...now I know. In addition, I learned about lossless vs. lossy compression and the practical uses of each.
First off, a Rasper image is represented by an array of colored dots. The problem with rasper graphics is that when it is zoomed or magnified, you are able to see the jaggedness or blocky aspects of the photograph. They do not scale well to larger sizes. As opposed to Vector Graphics which uses "primitives" (geometrical objects, points, lines, curves, and polygons that are all expressed mathematically. This results in the ability to zoom in or out almost infinitely with no loss of quality.
Lossless compression does not throw away any data but it eliminates redundancy in the image to save space. This is good for archiving and editing images. Lossy compression discards some data that is not usually discerned-- by the majority of people. It looks just as good/crisp and is widely used. The jpg image format uses this type of compression.
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