比较C#.NET中的图像

Image image = Image.FromFile("path/to/image.jpg");

image.Save("path/to/save/image.jpg", ImageFormat.Jpeg);

Image image = Image.FromFile("path/to/image.jpg");
Bitmap bitmap = new Bitmap(width, height);
using (Graphics graphics = Graphics.FromImage(bitmap))
{
    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
    graphics.DrawImage(image, 0, 0, width, height);
}
bitmap.Save("path/to/save/image.jpg", ImageFormat.Jpeg);

Image image = Image.FromFile("path/to/image.jpg");
Bitmap bitmap = new Bitmap(image);
int count = 0;
for (int x = 0; x< bitmap.Width; x++)
{
    for (int y = 0; y< bitmap.Height; y++)
    {
        Color color = bitmap.GetPixel(x, y);
        if (color.R == 0 && color.G == 0 && color.B == 0)
        {
            count++;
        }
    }
}