Sometimes image processing units inherit images in raster bitmap format only, so that processing is to be carried without knowledge of past operations that may compromise image quality (e.g., compression).
bitmap图象数据文件格式详解与编程： 本文作者---刘建华博士详细的介绍了位图bitmap图像数据文件格式；在此基础之上，实现bitmap图象数据文件的读写编程。希望对位图编程者有所帮助，互通有无... “A bitmap is a graphical object used to create, manipulate(scale, scroll, rotate, and paint), and store images as files on a disk. ----Microsoft
