Monday, March 29, 2010

IMAGE FILE TYPES

IMAGE FILE TYPES:
The most common by far are GIF and JPEG. Both of these encode static bitmap images. Both GIF and JPEG images compress themselves in different ways. In a GIF image, can show up to 256 pixels where as JPEG can show lots more. GIF is mostly used for icons, or littly images whereas JPEG is most used of larger photographs or images. In JPEG file has much more complex techniques to compress images, like the photographs. where the colour of every pixel is different. A GIF can make a perfect reproduction of the the orginal whereas JPEG cant. Animated GIF is a sequence of GIF files all bonded together and showed one after the other. You can get very reliastic animation if you have enough panes. The size of the file is the sum of GIF  files used to create the sequence, and that can add up quickly. An MPEG file uses a complex alogrithm, just like the JPEG file does. It tries to eliminate reduce reptition between frames to significantly compress a video information. MPEG files also alow soundtrack whereas the Animated GIF do not. MPEG files size can get quite large considering the a typical squence has hundreds or thousands of frames. Shockwave provides a vector-bse aninmation capability. A shockwave file specifies the coordinates of shapes such as lines, rectangles, circles etc. as well as the colour. Unlike the other files which specify only the colours of every pixel. Shockwave files can be very small in size unlike the MPEG. They allow animation and sound, the images of it are also scalable because they are vector-based. One great quality of shockwave files is that you can enlarge the image yet it'll look great.

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