using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace grafika1
{
    public partial class Form1 : Form
    {
        Bitmap pomoc;
        Bitmap obraz, kopia;
        public Form1()
        {
            InitializeComponent();
        }

        private void Negatyw()
        {
            obraz = new Bitmap(pictureBox1.Image);
            kopia = new Bitmap(obraz.Width, obraz.Height);
            pictureBox1.Image = obraz;

            pomoc = new Bitmap(obraz.Width, obraz.Height);
            Color punkt;
            for (int i = 0; i < obraz.Width; i++)
            {
                for (int j = 0; j < obraz.Height; j++)
                {
                    punkt = obraz.GetPixel(i, j);
                    pomoc.SetPixel(i, j, Color.FromArgb(255 - punkt.R, 255 - punkt.G, 255 - punkt.B));
                }
            }
             pictureBox2.Image = pomoc;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Negatyw();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            convertToGrayScale();
        }
        private void convertToGrayScale()
        {
            obraz = new Bitmap(pictureBox1.Image);
            kopia = new Bitmap(obraz.Width, obraz.Height);
            pictureBox1.Image = obraz;

            pomoc = new Bitmap(obraz.Width, obraz.Height);
            Color punkt;

            for (int i = 0; i < obraz.Width; i++)
            {
                for (int j = 0; j < obraz.Height; j++)
                {

                    punkt = obraz.GetPixel(i, j);
                    pomoc.SetPixel(i, j, Color.FromArgb((punkt.R+punkt.G+punkt.B)/3,(punkt.R+punkt.G+punkt.B)/3,(punkt.R+punkt.G+punkt.B)/3));

                }
            }
            pictureBox2.Image = pomoc;

        }
    }
}