Question

WPF里如何将Image控件里的图片反色

如何将image控件里的图片反色显示？ 用bitmap吗？
还有System.windows.control.Image 和 System.Drawing.Bitmap怎么转化呢........

Answer 1

找到一个图片反色的函数
public static bool Invert(Bitmap b)
{
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;

unsafe
{
byte * p = (byte *)(void *)Scan0;

int nOffset = stride - b.Width*3;
int nWidth = b.Width * 3;

for(int y=0;y<b.Height;++y)
{
for(int x=0; x < nWidth; ++x )
{
p[0] = (byte)(255-p[0]);
++p;
}
p += nOffset;
}
}

b.UnlockBits(bmData);

return true;
}

至于转换,直接强转就行了
Image img = new Bitmap(100,100);