C#使用GDI+实现图片高级处理(1) - 以底片效果显示图像

原理: 底片中的每个像素点颜色值都是正常图像对应像素点颜色值的取反( 满色为255).
1.通过 GetPixel 方法获得图像中每一点像素的值,
2.再使用 SetPixel 方法将取反后的颜色值设置到对应的点...

try
{
int Height = this.pictureBox1.Image.Height;
int Width = this.pictureBox1.Image.Width;
Bitmap newbitmap = new Bitmap(Width, Height);
Bitmap oldbitmap = (Bitmap)this.pictureBox1.Image;
Color pixel;
for (int x = 1; x < Width; x++)
{
for (int y = 1; y < Height; y++)
{
int r, g, b;
pixel = oldbitmap.GetPixel(x, y);
r = 255 - pixel.R;
g = 255 - pixel.G;
b = 255 - pixel.B;
newbitmap.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
this.pictureBox1.Image = newbitmap;
}