Bitmap deep copy changing PixelFormat

问题

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

img.PixelFormat is Format24bppRgb

when I am doing deep copy

Bitmap img2 = new Bitmap(img);

img.PixelFormat is changed to Format32bppArgb

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

回答1:

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);

回答2:

Just found solution instead new Bitmap(img) use Bitmap img2 = (Bitmap) img.Clone(); don't know it is the right solution, but it do the job.

来源：https://stackoverflow.com/questions/20044431/bitmap-deep-copy-changing-pixelformat