BMP、GIF和JPEG文件格式简介及相互转换
图象文件就是描绘了一幅图象的计算机磁盘文件。形成数字图象数据后，将其存储在计算机里的方法有2种，即位映射和向量处理方式。
我们这里主要讨论的是位图。不同图象软件几乎都用各种的方法处理图象，图象格式也多种多样，它主要包括文件识别头和图象数据。文件识别头用来让计算机判断是哪种文件格式，图象数据包含了整个对图象描绘相关数据，包括调色板、位图映象等。根
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