图像灰度化是许多数字图像处理的初始和基础工作, 本文对灰度化的基本原理作了简要阐述, 同时分别介 绍了8 位和24 位彩色位图灰度化的具体方法, 并给了实现详细代码。-Grayscale image is the initial number of digital image processing, and foundation work, this basic principle of graying briefly described, and introduced the 8-bit