【实际项目3】C#把文件夹中的RGB图片变为Gray图片

.        某个项目需要把某文件夹中的RGB图片变为Gray图片。

         以及需要把某个pin针文件中根据pin针的位置进行绘图，下图所示。

具体代码见：https://download.csdn.net/download/qq_34047402/92324511

C#把RGB图片变成Gray图片以及读取一些列点的XY坐标值进行绘图资源-CSDN下载

一、RGB图片变为Grey图片。

 private void btnColorBmpToGrey_Click(object sender, EventArgs e){    // 获取源文件夹中的所有BMP文件string[] bmpFiles = Directory.GetFiles(this.txtFolderName.Text);string folderPath = this.txtFolderName.Text + @"\image";// 检查文件夹是否存在if (!Directory.Exists(folderPath)){// 如果不存在，则创建文件夹Directory.CreateDirectory(folderPath);Console.WriteLine("文件夹已创建: " + folderPath);}foreach (string file in bmpFiles){string fileName = Path.GetFileName(file); // 获取文件名，包括扩展名string destinationPath = Path.Combine(folderPath, fileName); // 目标文件路径using (Bitmap originalImage = new Bitmap(file)){Bitmap bmp= RgbToGrayScale(originalImage);// 保存二值化图片（保持BMP格式，同名保存）this.pictureBox.Height = bmp.Height;this.pictureBox.Width = bmp.Width;this.pictureBox.Image = bmp;pictureBox.Image.Save(destinationPath, System.Drawing.Imaging.ImageFormat.Bmp);}                  } }/// <summary>  /// 将源图像灰度化，并转化为8位灰度图像。  /// </summary>  /// <param name="original"> 源图像。 </param>  /// <returns> 8位灰度图像。 </returns>  public static Bitmap RgbToGrayScale(Bitmap original){if (original != null){// 将源图像内存区域锁定  Rectangle rect = new Rectangle(0, 0, original.Width, original.Height);BitmapData bmpData = original.LockBits(rect, ImageLockMode.ReadOnly,original.PixelFormat);// 获取图像参数  int width = bmpData.Width;int height = bmpData.Height;int stride = bmpData.Stride;  // 扫描线的宽度  int offset = stride - width * 3;  // 显示宽度与扫描线宽度的间隙  IntPtr ptr = bmpData.Scan0;   // 获取bmpData的内存起始位置  int scanBytes = stride * height;  // 用stride宽度，表示这是内存区域的大小  // 分别设置两个位置指针，指向源数组和目标数组  int posScan = 0, posDst = 0;byte[] rgbValues = new byte[scanBytes];  // 为目标数组分配内存  Marshal.Copy(ptr, rgbValues, 0, scanBytes);  // 将图像数据拷贝到rgbValues中  // 分配灰度数组  byte[] grayValues = new byte[width * height]; // 不含未用空间。  // 计算灰度数组  for (int i = 0; i < height; i++){for (int j = 0; j < width; j++){double temp = rgbValues[posScan++] * 0.11 +rgbValues[posScan++] * 0.59 +rgbValues[posScan++] * 0.3;grayValues[posDst++] =(byte) temp;}// 跳过图像数据每行未用空间的字节，length = stride - width * bytePerPixel  posScan += offset;}// 内存解锁  Marshal.Copy(rgbValues, 0, ptr, scanBytes);original.UnlockBits(bmpData);  // 解锁内存区域  // 构建8位灰度位图  Bitmap retBitmap = BuiltGrayBitmap(grayValues, width, height);return retBitmap;}else{return null;}}/// <summary>  /// 用灰度数组新建一个8位灰度图像。  /// </summary>  /// <param name="rawValues"> 灰度数组(length = width * height)。 </param>  /// <param name="width"> 图像宽度。 </param>  /// <param name="height"> 图像高度。 </param>  /// <returns> 新建的8位灰度位图。 </returns>  private static Bitmap BuiltGrayBitmap(byte[] rawValues, int width, int height){// 新建一个8位灰度位图，并锁定内存区域操作  Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format8bppIndexed);BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, width, height),ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);// 计算图像参数  int offset = bmpData.Stride - bmpData.Width;        // 计算每行未用空间字节数  IntPtr ptr = bmpData.Scan0;                         // 获取首地址  int scanBytes = bmpData.Stride * bmpData.Height;    // 图像字节数 = 扫描字节数 * 高度  byte[] grayValues = new byte[scanBytes];            // 为图像数据分配内存  // 为图像数据赋值  int posSrc = 0, posScan = 0;                        // rawValues和grayValues的索引  for (int i = 0; i < height; i++){for (int j = 0; j < width; j++){grayValues[posScan++] = rawValues[posSrc++];}// 跳过图像数据每行未用空间的字节，length = stride - width * bytePerPixel  posScan += offset;}// 内存解锁  Marshal.Copy(grayValues, 0, ptr, scanBytes);bitmap.UnlockBits(bmpData);  // 解锁内存区域  // 修改生成位图的索引表，从伪彩修改为灰度  ColorPalette palette;// 获取一个Format8bppIndexed格式图像的Palette对象  using (Bitmap bmp = new Bitmap(1, 1, PixelFormat.Format8bppIndexed)){palette = bmp.Palette;}for (int i = 0; i < 256; i++){palette.Entries[i] = Color.FromArgb(i, i, i);}// 修改生成位图的索引表  bitmap.Palette = palette;return bitmap;}

二、把一个pin针的坐标位置值转换成图片。

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;namespace PointPlotter
{public partial class Form1 : Form{private List<PointF> points = new List<PointF>();public Form1(){InitializeComponent();this.Text = "点坐标绘图器";this.Size = new Size(800, 600);this.StartPosition = FormStartPosition.CenterScreen;}private List<PointF> ReadPointsFromFile(string filename){var pointsList = new List<PointF>();int lineNumber = 0;try{using (StreamReader reader = new StreamReader(filename)){string line;while ((line = reader.ReadLine()) != null){lineNumber++;line = line.Trim();// 跳过空行和注释行if (string.IsNullOrEmpty(line) || line.StartsWith("#"))continue;string[] parts = line.Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);if (parts.Length >= 2){if (float.TryParse(parts[0], out float x) && float.TryParse(parts[1], out float y)){pointsList.Add(new PointF(x, y));}else{Console.WriteLine($"警告: 第 {lineNumber} 行数据格式错误: {line}");}}else{Console.WriteLine($"警告: 第 {lineNumber} 行数据不完整: {line}");}}}}catch (Exception ex){throw new Exception($"读取文件 '{filename}' 时出错 (第 {lineNumber} 行): {ex.Message}");}return pointsList;}private void PlotPoints(PictureBox pictureBox){if (points.Count == 0){//  MessageBox.Show("没有可绘制的点数据，请先加载数据文件", "提示",//                MessageBoxButtons.OK, MessageBoxIcon.Warning);return;}// 创建位图Bitmap bitmap = new Bitmap(pictureBox.Width, pictureBox.Height);using (Graphics g = Graphics.FromImage(bitmap)){// 设置高质量绘图g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;g.Clear(Color.White);// 计算坐标范围float minX = float.MaxValue, maxX = float.MinValue;float minY = float.MaxValue, maxY = float.MinValue;foreach (var point in points){minX = Math.Min(minX, point.X);maxX = Math.Max(maxX, point.X);minY = Math.Min(minY, point.Y);maxY = Math.Max(maxY, point.Y);}// 添加边距float marginX = (maxX - minX) * 0.04f;float marginY = (maxY - minY) * 0.04f;minX -= marginX; maxX += marginX;minY -= marginY; maxY += marginY;// 计算缩放比例float scaleX = (pictureBox.Width ) / (maxX - minX);float scaleY = (pictureBox.Height) / (maxY - minY);float scale = Math.Min(scaleX, scaleY);// 绘制坐标轴DrawCoordinateSystem(g, pictureBox.Width, pictureBox.Height, minX, maxX, minY, maxY, scale);// 绘制点DrawPoints(g, points, minX, minY, scale, pictureBox.Width, pictureBox.Height);}pictureBox.Image = bitmap;}private void DrawCoordinateSystem(Graphics g, int width, int height, float minX, float maxX, float minY, float maxY, float scale){Pen axisPen = new Pen(Color.Black, 2);Pen gridPen = new Pen(Color.LightGray, 1) { DashStyle = System.Drawing.Drawing2D.DashStyle.Dash };Font labelFont = new Font("Arial", 8);Brush labelBrush = Brushes.Black;// 计算原点位置（左下角）float originX = 1;float originY = height - 1;// 绘制坐标轴// g.DrawLine(axisPen, originX, originY, width - 2, originY); // X轴// g.DrawLine(axisPen, originX, 1, originX, originY); // Y轴// 绘制网格和刻度float stepX = (maxX - minX) / 10;float stepY = (maxY - minY) / 10;for (float x = minX; x <= maxX; x += stepX){float screenX = originX + (x - minX) * scale;g.DrawLine(gridPen, screenX, 1, screenX, originY);//  g.DrawString(x.ToString("F1"), labelFont, labelBrush, screenX - 10, originY + 5);}for (float y = minY; y <= maxY; y += stepY){float screenY = originY - (y - minY) * scale;g.DrawLine(gridPen, originX, screenY, width - 1, screenY);//  g.DrawString(y.ToString("F1"), labelFont, labelBrush, 5, screenY - 6);}// 绘制坐标轴标签//   Font titleFont = new Font("Arial", 10, FontStyle.Bold);//   g.DrawString("X坐标", titleFont, Brushes.Black, width / 2 - 20, originY + 20);//   g.DrawString("Y坐标", titleFont, Brushes.Black, 10, 20);axisPen.Dispose();gridPen.Dispose();//   labelFont.Dispose();//   titleFont.Dispose();}private void DrawPoints(Graphics g, List<PointF> points, float minX, float minY, float scale, int width, int height){float originX = 1;float originY = height - 1;// 绘制点（圆形）Brush pointBrush = new SolidBrush(Color.FromArgb(180, Color.Red));Pen pointPen = new Pen(Color.DarkRed, 2);Font labelFont = new Font("Arial", 7);Brush labelBrush = Brushes.Blue;float pointRadius = 4.5f;foreach (var point in points){// 转换为屏幕坐标float screenX = originX + (point.X - minX) * scale;float screenY = originY - (point.Y - minY) * scale;// 绘制圆形点g.FillEllipse(pointBrush, screenX - pointRadius, screenY - pointRadius,pointRadius * 2, pointRadius * 2);g.DrawEllipse(pointPen, screenX - pointRadius, screenY - pointRadius,pointRadius * 2, pointRadius * 2);// 绘制坐标标签// string label = $"({point.X:F1}, {point.Y:F1})";// g.DrawString(label, labelFont, labelBrush, screenX + 8, screenY - 6);}pointBrush.Dispose();pointPen.Dispose();labelFont.Dispose();}private void SaveImage(PictureBox pictureBox){if (pictureBox.Image == null){MessageBox.Show("没有可保存的图片，请先绘制图形", "提示",MessageBoxButtons.OK, MessageBoxIcon.Warning);return;}using (SaveFileDialog saveFileDialog = new SaveFileDialog()){saveFileDialog.Filter = "PNG图片 (*.png)|*.png|JPEG图片 (*.jpg)|*.jpg|BMP图片 (*.bmp)|*.bmp";saveFileDialog.Title = "保存图片";saveFileDialog.FileName = "points_plot.png";if (saveFileDialog.ShowDialog() == DialogResult.OK){try{// 根据选择的格式保存图片var format = System.Drawing.Imaging.ImageFormat.Png;string extension = Path.GetExtension(saveFileDialog.FileName).ToLower();switch (extension){case ".jpg":case ".jpeg":format = System.Drawing.Imaging.ImageFormat.Jpeg;break;case ".bmp":format = System.Drawing.Imaging.ImageFormat.Bmp;break;default:format = System.Drawing.Imaging.ImageFormat.Png;break;}pictureBox.Image.Save(saveFileDialog.FileName, format);MessageBox.Show($"图片已保存为: {saveFileDialog.FileName}", "保存成功",MessageBoxButtons.OK, MessageBoxIcon.Information);}catch (Exception ex){MessageBox.Show($"保存图片时出错: {ex.Message}", "错误",MessageBoxButtons.OK, MessageBoxIcon.Error);}}}}private void SaveImage(PictureBox pictureBox, string strDir, string fileName){if (pictureBox.Image == null){return;}try{// 根据选择的格式保存图片var format = System.Drawing.Imaging.ImageFormat.Bmp;string extension = Path.GetExtension(fileName).ToLower();switch (extension){case ".jpg":case ".jpeg":format = System.Drawing.Imaging.ImageFormat.Jpeg;break;case ".bmp":format = System.Drawing.Imaging.ImageFormat.Bmp;break;default:format = System.Drawing.Imaging.ImageFormat.Png;break;}string FullFileName = Path.Combine(strDir, fileName);pictureBox.Image.Save(FullFileName, format);}catch (Exception ex){;}}private void CreateListPictures(){ListFilesInFolder();string folderPath = this.txtFolderName.Text + @"\image";// 检查文件夹是否存在if (!Directory.Exists(folderPath)){// 如果不存在，则创建文件夹Directory.CreateDirectory(folderPath);Console.WriteLine("文件夹已创建: " + folderPath);}if (files!=null && files.Length>0){foreach(var file in files){points = ReadPointsFromFile(file);if(points!=null && points.Count>0){PlotPoints(pictureBox);                        SaveImage(pictureBox, this.strFolderName + @"\image", Path.GetFileNameWithoutExtension(file) + ".jpg");}}}         }string strFolderName = string.Empty;string[] files = null;public void ListFilesInFolder(){strFolderName = this.txtFolderName.Text;Console.WriteLine("文件列表:");Console.WriteLine(new string('-', 50));try{// 获取所有文件files = Directory.GetFiles(strFolderName);foreach (string file in files){Console.WriteLine(file);}Console.WriteLine($"\n共找到 {files.Length} 个文件");}catch (Exception ex){Console.WriteLine($"读取文件夹时出错: {ex.Message}");}}private void btnLoad_Click(object sender, EventArgs e){using (OpenFileDialog openFileDialog = new OpenFileDialog()){openFileDialog.Filter = "文本文件 (*.dat)|*.dat|所有文件 (*.*)|*.*";openFileDialog.Title = "选择点坐标数据文件";if (openFileDialog.ShowDialog() == DialogResult.OK){try{points = ReadPointsFromFile(openFileDialog.FileName);MessageBox.Show($"成功加载 {points.Count} 个点坐标", "加载完成",MessageBoxButtons.OK, MessageBoxIcon.Information);}catch (Exception ex){MessageBox.Show($"读取文件时出错: {ex.Message}", "错误",MessageBoxButtons.OK, MessageBoxIcon.Error);}}}}private void btnPlot_Click(object sender, EventArgs e){PlotPoints(pictureBox);}private void btnSave_Click(object sender, EventArgs e){SaveImage(pictureBox);}private void btnCreatePictures_Click(object sender, EventArgs e){CreateListPictures();}}}