以24位RGB位图填充 [英] Padding in 24-bits rgb bitmap

问题描述

有人可以向我解释为什么在24位RGB位图文件中我必须添加一个填充，其大小取决于图像的宽度吗?什么用?

could somebody explain to me why in 24-bit rgb bitmap file I have to add a padding which size depends on width of image ? What for ?

我的意思是我必须将此代码添加到我的程序中(在C中):

I mean I must add this code to my program (in C):

 if( read % 4 != 0 ) {
   read = 4 - (read%4);
   printf( "Padding: %d bytes\n", read );
   fread( pixel, read, 1, inFile );
  }

推荐答案

因为24位是奇数个字节(3)，并且由于多种原因，所有图像行都必须从一个整数倍的地址开始4个字节.

Because 24 bits is an odd number of bytes (3) and for a variety of reasons all the image rows are required to start at an address which is a multiple of 4 bytes.

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