Image Processing algorithms with CSharp and Xamarin IDE on osx

CSharpImageProcessing.cs

using System;
using System.Drawing;
using System.IO;

namespace ImageProcessing
{
	class MainClass
	{
		static void RunImage()
		{
			var f = File.OpenRead("piyush.jpg");
			var img = Image.FromStream(f);
			var bmp = new Bitmap(img);

			//GrayFilter(bmp);
			//NegativeFilter(bmp);
			//LogFilter(bmp);
			GammaFilter(bmp);

			bmp.Save("grayscale.jpg");

			f.Close();
		}

		static void GrayFilter(Bitmap bmp)
		{
			var width = bmp.Width;
			var height = bmp.Height;

			for (var i = 0; i < height; i++)
			{
				for (var j = 0; j < width; j++)
				{
					var c = bmp.GetPixel(j, i);
					var red = Convert.ToByte(c.R * 0.299);
					var green = Convert.ToByte(c.G * 0.587);
					var blue = Convert.ToByte(c.B * 0.114);

					var color = Color
						.FromArgb(red + green + blue, red + green + blue, red + green + blue);
					bmp.SetPixel(j, i, color);
				}
			}
		}

		static void NegativeFilter(Bitmap bmp)
		{
			var width = bmp.Width;
			var height = bmp.Height;

			for (var i = 0; i < height; i++)
			{
				for (var j = 0; j < width; j++)
				{
					var c = bmp.GetPixel(j, i);
					var red = 255 - c.R;
					var green = 255 - c.G;
					var blue = 255 - c.B;

					var color = Color
						.FromArgb(red, green, blue);
					bmp.SetPixel(j, i, color);
				}
			}
		}

		static void LogFilter(Bitmap bmp)
		{
			var width = bmp.Width;
			var height = bmp.Height;

			for (var i = 0; i < height; i++)
			{
				for (var j = 0; j < width; j++)
				{
					var c = bmp.GetPixel(j, i);
					var con = 100;
					var red = Convert.ToByte(con * Math.Log10(c.R + 1));
					var green = Convert.ToByte(con * Math.Log10(c.G + 1));
					var blue = Convert.ToByte(con * Math.Log10(c.B + 1));

					var color = Color
						.FromArgb(red, green, blue);
					bmp.SetPixel(j, i, color);
				}
			}
		}

		static void GammaFilter(Bitmap bmp)
		{
			var width = bmp.Width;
			var height = bmp.Height;

			for (var i = 0; i < height; i++)
			{
				for (var j = 0; j < width; j++)
				{
					var c = bmp.GetPixel(j, i);
					var con = 100;
					var Gamma = 1 / 10.0;
					var red = Convert.ToByte(con * Math.Pow(c.R, Gamma));
					var green = Convert.ToByte(con * Math.Pow(c.G, Gamma));
					var blue = Convert.ToByte(con * Math.Pow(c.B, Gamma));

					var color = Color
						.FromArgb(red, green, blue);
					bmp.SetPixel(j, i, color);
				}
			}
		}
			
		public static void Main(string[] args)
		{
			Console.WriteLine("Image Processing Algorithms!");
			RunImage();
		}
	}
}

Example outputs:

Negative Filter

Make sure to add the piyush.jpg in Xamarin IDE by selecting add files. Also, select the copy to output by right-clicking. The file is given below: