【C#学习笔记】图片像素操作

标签：initial   app   blog   windows   art   oid   dia   window   width    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 System.Drawing.Imaging; namespace WindowsFormsApplication4 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { OpenFileDialog dig = new OpenFileDialog(); if (dig.ShowDialog() == DialogResult.OK) pictureBox1.Image = Image.FromFile(dig.FileName); } unsafe private void button2_Click(object sender, EventArgs e) { Bitmap bitmap =(Bitmap)pictureBox1.Image.Clone(); //创建副本，避免操作原图像 Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height); BitmapData bmpdata= bitmap.LockBits(rect, ImageLockMode.ReadWrite,bitmap.PixelFormat); byte* pix = (byte*)bmpdata.Scan0; if (bitmap.PixelFormat==PixelFormat.Format8bppIndexed) //是否为灰度图 { for (int i = 0; i