如何在位图上交换红色和蓝色通道?

问题描述

如何在位图上交换红色和蓝色通道而不使用不安全的方法并在c#中快速?

提前谢谢.


谢谢.这是c#中的代码:

How to swap Red and Blue channels on bitmap without using unsafe methods and fast in c#?

Thanks in advance.


Thanks . Here is the code in c#:

private Bitmap SwapRedAndBlueChannels(Bitmap bitmap)
        {
            var imageAttr = new ImageAttributes();
            imageAttr.SetColorMatrix(new ColorMatrix(
                                         new[]
                                             {
                                                 new[] {0.0F, 0.0F, 1.0F, 0.0F, 0.0F},
                                                 new[] {0.0F, 1.0F, 0.0F, 0.0F, 0.0F},
                                                 new[] {1.0F, 0.0F, 0.0F, 0.0F, 0.0F},
                                                 new[] {0.0F, 0.0F, 0.0F, 1.0F, 0.0F},
                                                 new[] {0.0F, 0.0F, 0.0F, 0.0F, 1.0F}
                                             }
                                         ));
            var temp = new Bitmap(bitmap.Width, bitmap.Height);
            GraphicsUnit pixel = GraphicsUnit.Pixel;
            using (Graphics g = Graphics.FromImage(temp))
            {
                g.DrawImage(bitmap, Rectangle.Round(bitmap.GetBounds(ref pixel)), 0, 0, bitmap.Width, bitmap.Height,
                            GraphicsUnit.Pixel, imageAttr);
            }

            return temp;
        }

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