效果

灰度图

黑白色反转

彩色反转

项目

代码 using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using OpenCvSharp;using OpenCvSharp.Extensions;namespace OpenCvSharp_颜色反转{ public partial Form1 : Form { public Form1() { InitializeComponent(); } private string fileFilter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png"; Bitmap bmp; String imgPath = ""; private void button2_Click(object sender, EventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); ofd.Filter = fileFilter;if (ofd.ShowDialog() != DialogResult.OK) return; imgPath = ofd.FileName; bmp = new Bitmap(imgPath); pictureBox1.Image = bmp; } private void button1_Click(object sender, EventArgs e) {if (imgPath == "") {return; } Mat mat = new Mat(imgPath); Cv2.CvtColor(mat, mat, ColorConversionCodes.BGR2GRAY); Mat dst = new Mat(mat.Height, mat.Width, mat.Type(), Scalar.White); byte grayPixel = 0;for (int r = 0; r < dst.Rows; r++) {for (int c = 0; c < dst.Cols; c++) { grayPixel = mat.At<byte>(r, c); dst.Set<byte>(r, c, (byte)(255 - grayPixel)); } }if (pictureBox2.Image != ) { pictureBox2.Image.Dispose(); } pictureBox2.Image = BitmapConverter.ToBitmap(dst); } private void button4_Click(object sender, EventArgs e) {if (imgPath == "") {return; } Mat mat = new Mat(imgPath); Cv2.CvtColor(mat, mat, ColorConversionCodes.BGR2GRAY);if (pictureBox2.Image != ) { pictureBox2.Image.Dispose(); } pictureBox2.Image = BitmapConverter.ToBitmap(mat); } private void button3_Click(object sender, EventArgs e) {if (imgPath == "") {return; } Mat mat = new Mat(imgPath); Mat dst = new Mat(mat.Height, mat.Width, mat.Type(), Scalar.White); Vec3b vec3B;for (int r = 0; r < dst.Rows; r++) {for (int c = 0; c < dst.Cols; c++) { vec3B = mat.At<Vec3b>(r, c); vec3B.Item0 = (byte)(255 - vec3B.Item0); vec3B.Item1 = (byte)(255 - vec3B.Item1); vec3B.Item2 = (byte)(255 - vec3B.Item2); dst.Set<Vec3b>(r, c, vec3B); } }if (pictureBox2.Image != ) { pictureBox2.Image.Dispose(); } pictureBox2.Image = BitmapConverter.ToBitmap(dst); } }}