本篇教程介绍了直方图的修正和彩色变换，里面的内容包括了反色，彩色图转灰度图，真彩图转256色图等，是一篇很好的图像处理C++文档。-This tutorial introduces histogram correction and color transformation, which includes color, color to grayscale, true color to 256 color chart, is a very good image processing C++ doc