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注册时间2009-10-29
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回复 7# Icaro77
We draw it ourselves, k?
Let me explain it 2 U in detail..... I will write it in both Engilsh and Chinese, this may help all others, who just know little about image/graph in Computer Science
让我来仔细给你讲解。。。我会用中英文来写,这样可以给一些不懂 计算机中 图形存在形式的 童鞋 一些帮助。。。
First all, there are two kind of graph:
首先,我来区分一下,在计算机中图形 存在的形式。。
1> Bitmap, like what you showed to us, all the real photos, jpg file, bmp are all this kind of image.
位图,就像你给出的这些图片,所有的相片,jpg文件,bmp文件等等,
In Computer, these graph are displayed by pixel, (you can realize it as a lot of dot with color)
在计算机中,这些图片都是用 pixel(像素)来描绘的,(我们可以把它想象成一一个个带颜色的点)
So if you try to expand this kind of picture, what will be the result....
所以,如果我们试图 放大这些点,结果》》》
Some kind of similar will be fill to the adjacent position (Like if we try to expand a pic as twice as its original size, one pix will be shared by all the adjacent 3 points).... Then this is so called 'distortion'....
一些相同/相近颜色的点就会被填充到向邻的位置,(就像我们把一个图放大两倍,也就是一个点会被周围3个点共享)。。。这就是我们所谓的 失真~~~
2> VectorGraph, this kind of image is described/displayed by functions. So it will not relate to the pixel any longer, if you try to expand it, the funciton will give what you want....
第二种叫做矢量图,这些图形都是用方程(计算计语言中的方程)来描绘的,所以我们想拉多大,就多大,不会因为像素的关机失真。。。
Thus, the only possible image you want to expand without losing any pixel is such a vector graph.
所以,这是唯一我们可以放大而不是真的图片格式 |
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