public override ImgProps Process(ImgProps input)
{
double centerX = input.Width / 2;
double centerY = input.Height / 2;
double maxDistance = Math.Sqrt(Math.Pow(centerX, 2) + Math.Pow(centerY, 2));
double distX;
double distY;
double distance;
double brightness;
ImgProps vignetteImage = new ImgProps(input.Width, input.Height);
for (int i = 0; i < input.Width; i++)
{
for (int j = 0; j < input.Height; j++)
{
distX = centerX - i;
distY = centerY - j;
distance = (int)(Math.Sqrt(Math.Pow(distX, 2) + Math.Pow(distY, 2)));
brightness = Math.Pow(((maxDistance - distance) / maxDistance), 2);
vignetteImage[i, j] = new Rgba32(
ImageUtility.RestrictOverflow((int)(input[i, j].R * brightness)),
ImageUtility.RestrictOverflow((int)(input[i, j].G * brightness)),
ImageUtility.RestrictOverflow((int)(input[i, j].B * brightness)),
input[i, j].A
);
}
}
return(vignetteImage);
}