Gray-scale system Brightness is measured in a range of values,one scale ranges from 0 to 15,and another from 0 to 255.The 0 is represented by black,the highest number is white,and the numbers in between represent different shades of gray,The computer then makes the calculations and converts the numbers into a picture that shows an image of the object in question.那么我要开始翻译了 灰阶系统（外界的）光被用一定范围内的数值表示，一种计量方式是从0到15，另一种则是从0到255.0用黑色表示，最高的那个数用白色表示，中间的那些数字则表示不同的灰度，之后电脑计算并且把这些数字转化成为一张显示所求物体图像的图片。我是门外汉，英语垃圾，科学垃圾。shade vi. 逐渐变化 只是来水经验的求不打