对于任何想要一种快速方法来反转位图颜色而不使用不安全的人:
public static void BitmapInvertColors(Bitmap bitmapImage)
{
var bitmapRead = bitmapImage.LockBits(new Rectangle(0, 0, bitmapImage.Width, bitmapImage.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppPArgb);
var bitmapLength = bitmapRead.Stride * bitmapRead.Height;
var bitmapBGRA = new byte[bitmapLength];
Marshal.Copy(bitmapRead.Scan0, bitmapBGRA, 0, bitmapLength);
bitmapImage.UnlockBits(bitmapRead);
for (int i = 0; i < bitmapLength; i += 4)
{
bitmapBGRA[i] = (byte)(255 - bitmapBGRA[i]);
bitmapBGRA[i + 1] = (byte)(255 - bitmapBGRA[i + 1]);
bitmapBGRA[i + 2] = (byte)(255 - bitmapBGRA[i + 2]);
// [i + 3] = ALPHA.
}
var bitmapWrite = bitmapImage.LockBits(new Rectangle(0, 0, bitmapImage.Width, bitmapImage.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppPArgb);
Marshal.Copy(bitmapBGRA, 0, bitmapWrite.Scan0, bitmapLength);
bitmapImage.UnlockBits(bitmapWrite);
}
Bitmap GetPixel 和 SetPixel 非常慢,此方法通过将 Bitmap 像素复制到字节数组中来工作,然后您可以循环并更改,最后再将像素复制回来。