问题描述
我有一个非透明的，彩色的位图长2480，宽3507。
I have a non transparent, colour bitmap with length 2480 and width 3507.
使用 Bitmap.GetPixel（INT X，int y）对我能够得到位图中的每个像素的颜色信息。
Using Bitmap.GetPixel(int x, int y) I am able to get the colour information of each pixel in the bitmap.
如果我喷的位图到一个byte []：
If I squirt the bitmap into a byte[]:
MemoryStream ms = new MemoryStream();
bmp.Save(ms, ImageFormat.Bmp);
ms.Position = 0;
byte[] bytes = ms.ToArray();
那么我希望有相同的信息，即我可以去字节[1000]和读取的颜色信息的像素。
then I'd expect to have the same information, i.e. I can go to bytes[1000] and read the colour information for that pixel.
事实证明，我的字节数组比我预期的要大。我想我会得到一个包含有2480 x 3507 = 8697360元。相反，我得到一个数组8698438元 - 某种头的我presume
It turns out that my array of bytes is larger than I anticipated. I thought I'd get an array with 2480 x 3507 = 8697360 elements. Instead I get an array with 8698438 elements - some sort of header I presume.
在什么样的格式在我的数组中的字节存储？是否有一个头长其次是Alpha，红，绿，蓝值1078字节，每个字节的元素，还是其他什么东西？
In what format the bytes in my array stored? Is there a header 1078 bytes long followed by Alpha, Red, Green, Blue values for every byte element, or something else?
我需要的是色彩信息的每一个像素。我不关心的报头（或实际上的透明性），除非我需要它，使色彩信息。
All I need is the colour information for each pixel. I'm not concerned with the header (or indeed the transparency) unless I need it to get the colour info.
推荐答案
您正在呼叫的GetBuffer 返回底层的字节数组 - 这是大于的实际长度流。
You're calling GetBuffer which returns the underlying byte array - that's bigger than the actual length of the stream.
为的使用
byte[] bytes = ms.ToArray();
或的使用的GetBuffer 但与 ms.Length 一起使用。
or use GetBuffer but in conjunction with ms.Length.
说了这么多，你将其保存为BMP - 所以就会有头信息为好;它不喜欢的第一个字节将重新present第一像素。不幸的是有没有原始的形象，据我所看到的格式...这就是它听起来像什么，你真正想要的。
Having said that, you're saving it as a BMP - so there'll be header information as well; it's not like the first byte will represent the first pixel. Unfortunately there's no "raw" image format as far as I can see... that's what it sounds like you really want.
您可以使用 Bitmap.LockBits ，然后将数据从那里复制，如果你想......
You could use Bitmap.LockBits and then copy the data from there, if you want...
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