public static void threshold(string image_path, string output_path, int brightness = 20, int contrast = 20, int posterize = 2) { using (MagickImage image = new MagickImage(image_path)) { image.BrightnessContrast(brightness, contrast); image.ColorSpace = ColorSpace.Gray; image.Posterize(posterize); image.Normalize(); image.Write(output_path); } }
private void ExecutePosterize(XmlElement element, MagickImage image) { Hashtable arguments = new Hashtable(); foreach (XmlAttribute attribute in element.Attributes) { if (attribute.Name == "channels") arguments["channels"] = Variables.GetValue<Channels>(attribute); else if (attribute.Name == "levels") arguments["levels"] = Variables.GetValue<Int32>(attribute); else if (attribute.Name == "method") arguments["method"] = Variables.GetValue<DitherMethod>(attribute); } if (OnlyContains(arguments, "levels")) image.Posterize((Int32)arguments["levels"]); else if (OnlyContains(arguments, "levels", "channels")) image.Posterize((Int32)arguments["levels"], (Channels)arguments["channels"]); else if (OnlyContains(arguments, "levels", "method")) image.Posterize((Int32)arguments["levels"], (DitherMethod)arguments["method"]); else if (OnlyContains(arguments, "levels", "method", "channels")) image.Posterize((Int32)arguments["levels"], (DitherMethod)arguments["method"], (Channels)arguments["channels"]); else throw new ArgumentException("Invalid argument combination for 'posterize', allowed combinations are: [levels] [levels, channels] [levels, method] [levels, method, channels]"); }
public void Test_Posterize() { using (MagickImage image = new MagickImage(Files.FujiFilmFinePixS1ProJPG)) { image.Posterize(5); #if Q8 ColorAssert.AreEqual(new MagickColor("#3f7fbf"), image, 300, 150); ColorAssert.AreEqual(new MagickColor("#3f3f7f"), image, 495, 270); ColorAssert.AreEqual(new MagickColor("#3f3f3f"), image, 445, 255); #elif Q16 || Q16HDRI ColorAssert.AreEqual(new MagickColor("#3fff7fffbfff"), image, 300, 150); ColorAssert.AreEqual(new MagickColor("#3fff3fff7fff"), image, 495, 270); ColorAssert.AreEqual(new MagickColor("#3fff3fff3fff"), image, 445, 255); #else #error Not implemented! #endif } }