вы можете попробовать это
Bitmap bmp = new Bitmap("filename");
//to get the pixel color
Color c= bmp.GetPixel(50,50);
//to set the color of the pixel
bmp.SetPixel(50, 50, Color.Green);
Приведенный ниже код даст вам все пиксельные координаты в изображении
namespace WindowsFormsApplication4
{
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
public partial class Form1 : Form
{
private const string FILE_NAME = @"C:\Temp\Capture.png";
private const double BW_THRESHOLD = 0.5;
private readonly Color colorBlack =
Color.FromArgb(255, 0, 0, 0);
private readonly Color colorWhite =
Color.FromArgb(255, 255, 255, 255);
private readonly Bitmap originalImage;
private readonly Bitmap convertedImage;
private readonly List<Vertex> vertices = new List<Vertex>();
public Form1()
{
InitializeComponent();
pictureBox1.ImageLocation = FILE_NAME;
this.originalImage = new Bitmap(FILE_NAME);
this.convertedImage = this.Img2BW(this.originalImage, BW_THRESHOLD);
foreach (Vertex vert in this.vertices)
{
listBox1.Items.Add(vert.ToString());
}
}
private Bitmap Img2BW(Bitmap imgSrc, double threshold)
{
int width = imgSrc.Width;
int height = imgSrc.Height;
Color pixel;
Bitmap imgOut = new Bitmap(imgSrc);
for (int row = 0; row < height - 1; row++)
{
for (int col = 0; col < width - 1; col++)
{
pixel = imgSrc.GetPixel(col, row);
if (pixel.GetBrightness() < threshold)
{
this.vertices.Add(new Vertex(col, row));
imgOut.SetPixel(col, row, this.colorBlack);
}
else
{
imgOut.SetPixel(col, row, this.colorWhite);
}
}
}
return imgOut;
}
}
public class Vertex
{
public Vertex(int i, int j)
{
this.X = i;
this.Y = j;
}
public int X { get; set; }
public int Y { get; set; }
public string ToString()
{
return string.Format("({0}/{1})", this.X, this.Y);
}
}
}