位图深拷贝改变的PixelFormat [英] Bitmap deep copy changing PixelFormat

问题描述

Bitmap img = new Bitmap("C:\\temp\\images\\file.jpg");

img.PixelFormat是Format24bppRgb

img.PixelFormat is Format24bppRgb

当我做深拷贝

Bitmap img2 = new Bitmap(img);

img.PixelFormat改变为Format32bppArgb

img.PixelFormat is changed to Format32bppArgb

为什么它会改变像素格式？如何使深拷贝的对象，如果它不会使深层副本？

why does it change pixel format? and how to make deep copy for the object if it doesn't make deep copy?

推荐答案

您可以复制这样的位图，这将创建一个深度复制：

You can clone the bitmap like this, which will create a deep copy:

Bitmap img = new Bitmap("C:\\temp\\images\\file.jpg");

// Clone the bitmap.
Rectangle cloneRect = new Rectangle(0, 0, img.Width, img.Height);
System.Drawing.Imaging.PixelFormat format =
    img.PixelFormat;
Bitmap img2 = img.Clone(cloneRect, format);

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