在C#中使用二进制读取器读取位图文件 [英] Read bitmap file using binary reader in c#

问题描述

我已经编写了一个使用位图类显示位图图像的程序，但是我的实际要求是使用二进制阅读器显示位图图像，然后将其转换为灰度...请帮助我.
我只是不想使用位图类，想通过使用Binary Reader来完成任务，并且在使用Binary Reader读取图像后，我要求将其转换为GreyScale，现在我希望我已经阐明了我的问题.帮助！ !!

I have made a program which displays a bitmap image by using bitmap class.But my actual requirement is to display a bitmap image using binary reader and then convert it into grayscale...please help me out in this.
I just d''not want to use bitmap class,want to accomplish the task by using Binary Reader and after reading the Image using Binary Reader, i require it to be converted into GreyScale, now i hope i have clarified my question.Help!!!

推荐答案

如果您使用二进制读取器读取位图(即作为原始数据字节)，然后尝试手动将其转换为灰度，则必须继续阅读并实现位图文件格式-可能要比将图像转换为灰度级还要多得多.

此处提供了有关如何进行此类转换的代码的教程: http: //www.switchonthecode.com/tutorials/csharp-tutorial-convert-a-color-image-to-grayscale [

If you read a bitmap with a binary reader (i.e. as raw data bytes) and then try to convert it to grayscale manually, then you will have to read up on and implement Bitmap file format - probably a lot more than you need to do, in order to convert an image to greyscale.

There is a tutorial with code on how to do such conversion here: http://www.switchonthecode.com/tutorials/csharp-tutorial-convert-a-color-image-to-grayscale[^]

这是一个不好的方法，但是很多原因.首先，这两个:1)太难，不可靠且难以维护，2)绝对不需要.

假设要使用System.Drawing，则需要执行以下操作:

• 使用类System.Drawing.Bitmap;使用文件的构造函数之一从文件中读取位图.
• 创建具有不同像素格式(无论您需要什么，例如每个像素8位)和相同大小的目标位图.
• 使用System.Drawing.Bitmap.LockBits访问源位图和目标位图；
• PROFIT！

This is a bad approach, but many reasons. First of all, the two: 1) it''s too difficult, unreliable and hard to maintain, 2) absolutely non needed.

Assuming you want to use System.Drawing, you need to do the following:

• Use the class System.Drawing.Bitmap; read the bitmap from file using one of its constructors.
• Create a target bitmap with the different pixel format (whatever you need, like 8 bits per pixel) and the same size.
• Get access to source bitmap and target bitmaps using System.Drawing.Bitmap.LockBits; move data appropriately with the conversion of each bit you need.
• PROFIT!

尝试
将C#RGB转换为基于调色板的8位灰度位图类 [

Try
C# RGB to Palette Based 8-bit Greyscale Bitmap Class[^]

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