学习图片压缩的原理及方法（Principles and methods of learning pression）.doc

学****图片压缩的原理及方法(Principles and methods of learning pression)
The principle and method of pression 2009-09-29 13:07
For Photoshop's hobby and learning, two days ago to rent a large World Encyclopedia of library, computer display results into the D disk only more than 4GB of space, such as I love the information stored in people is too little, and I found that large pictures is about this is my collection, and usually the size of the images on the are very different, I save the picture is generally 100KB right, unless it is taken by a digital camera is about , and judging from the performance of 100KB is not a clear picture, then try to give pressed encyclopedia Gallery, today's article simply introducing the principle of pression and simple method.
First of all, I'd like to introduce two techniques for displaying pictures on puter,
There are two kinds of picture representation techniques, bitmap technology and vector graphics technology. Vector graphics are mainly used puter generated cartoon graphics and mathematical rules, graphics, and so on, and usually we live in contact with more, such as digital photos, scanning into puter pictures are bitmap.
For the vector map, compression is not necessary, because the vector map is realized by mand, and not to form the
lattice, so no matter how much you put him, shrink small, or that mands a few, there is no change, but t