public static Image <Pixel32> ColorAccent(this Image <Pixel32> image, double hue, double hueRange)
{
var h1 = (hue - hueRange / 2d + 360d) % 360d;
var h2 = (hue + hueRange / 2d + 360d) % 360d;
image.ForEach((x, y) =>
{
var pixel = image.Get(x, y);
var pixelHue = pixel.ToHSV().H;
bool toGrayscale = false;
if (h1 <= h2)
{
if (pixelHue < h1 || pixelHue > h2)
{
toGrayscale = true;
}
}
else
{
if (pixelHue < h1 && pixelHue > h2)
{
toGrayscale = true;
}
}
if (toGrayscale)
{
var grayscale = GrayscaleExtension.Luminance(pixel);
image.Set(x, y, new Pixel32(pixel.A, grayscale));
}
});
return(image);
}
public static Image <Pixel32> BlackAndWhite(this Image <Pixel32> image, byte threshold = 127)
{
Pixel32 pixelOperator(Pixel32 pixel)
{
var grayscale = GrayscaleExtension.Luminance(pixel);
if (grayscale > threshold)
{
return(new Pixel32(pixel.A, 255));
}
else
{
return(new Pixel32(pixel.A, 0));
}
};
return(image.BlackAndWhite(pixelOperator));
}
public Pixel8 ToPixel8()
{
var gs = GrayscaleExtension.Luminance(this);
return(new Pixel8(gs));
}
public Pixel1 ToPixel1()
{
var gs = GrayscaleExtension.Luminance(this);
return(new Pixel1(gs > 127));
}
