[C#][VB.NET]反轉圖片顏色

2009-06-03

反轉圖片顏色

Introduction

本篇的主旨在於介紹如何反轉圖片的顏色。欲把圖片顏色反轉，我們只需把圖片上的每個像素的RGB值設為其與255的差值即可。

VB.NET

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'Author: Larry Nung

'Date: 2009/6/2

'File:

'Memo:

'|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

''' <summary>

'''

''' </summary>

''' <remarks></remarks>

Public Class Form1

    '***************************************************************************

    'Author: Larry Nung

    'Date: 2009/6/2

    'Purpose:

    'Memo:

    '***************************************************************************

    ''' <summary>

    ''' Handles the Click event of the Button1 control.

    ''' </summary>

    ''' <param name="sender">The source of the event.</param>

    ''' <param name="e">The <see cref="System.EventArgs" /> instance containing the event data.</param>

    ''' <remarks></remarks>

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        If OpenFileDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then

            Me.PictureBox1.Image = GetInvertBitmap(OpenFileDialog1.FileName)

        End If

    End Sub

    '***************************************************************************

    'Author: Larry Nung

    'Date: 2009/6/2

    'Purpose:

    'Memo:

    '***************************************************************************

    ''' <summary>

    ''' Gets the invert bitmap.

    ''' </summary>

    ''' <param name="file">The file.</param>

    ''' <returns></returns>

    ''' <remarks></remarks>

    Private Function GetInvertBitmap(ByVal file As String) As Bitmap

        Dim bmp As Bitmap = New Bitmap(file)

        For x As Integer = 0 To bmp.Width - 1

            For y As Integer = 0 To bmp.Height - 1

                Dim color As Color = bmp.GetPixel(x, y)

                bmp.SetPixel(x, y, color.FromArgb(255 - color.R, 255 - color.G, 255 - color.B))

            Next

        Next

        Return bmp

    End Function

End Class

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;

namespace WindowsFormsApplication1

    //|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

    //Author: Larry Nung

    //Date: 2009/6/2

    //File:

    //Memo:

    //|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

    /// <summary>

///

    /// </summary>

    public partial class Form1 : Form

        public Form1()

            InitializeComponent();

        //***************************************************************************

        //Author: Larry Nung

        //Date: 2009/6/2

        //Purpose:

        //Memo:

        //***************************************************************************

        /// <summary>

        /// Handles the Click event of the button1 control.

        /// </summary>

        /// <param name="sender">The source of the event.</param>

        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>

        private void button1_Click(object sender, EventArgs e)

            if (openFileDialog1.ShowDialog() == DialogResult.OK)

                pictureBox1.Image = GetInvertBitmap(openFileDialog1.FileName);

        //***************************************************************************

        //Author: Larry Nung

        //Date: 2009/6/2

        //Purpose:

        //Memo:

        //***************************************************************************

        /// <summary>

        /// Gets the invert bitmap.

        /// </summary>

        /// <param name="file">The file.</param>

        /// <returns></returns>

        private Bitmap GetInvertBitmap(string file)

            Bitmap bmp = new Bitmap(file);

            for (int x = 0; x < bmp.Width; x++)

                for (int y = 0; y < bmp.Height; y++)

                    Color color = bmp.GetPixel(x, y);

                    bmp.SetPixel(x, y, Color.FromArgb(255 - color.R, 255 - color.G, 255 - color.B));

            return bmp;

執行結果：