c#的图像处理(直方图；反差，密度的四边圆补偿示例)

模拟Photo的直方图，不过只是显示；
有对图像四角的密度和反差进行补偿，这是现在LDD（LCD+LED）数码裁放机上常用的补偿方法！
主要还是对GDI+的应用，大家不妨看看原码！

http://www.nxxn.net/soft/dreign.rar
//图像处理--------------------------------------------------------------------------------------

using System;
using System.Drawing;
using System.Drawing.Imaging;

namespace zft
{
public class BitmapFilter
{
public static bool modu1(Bitmap image,int r,int g,int b)
{
if(r==0) r=1;
if(g==0) g=1;
if(b==0) b=1;
BitmapData bmData = image.LockBits(new Rectangle(0, 0,image.Width , image.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
unsafe
{
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - image.Width*3;

int nWidth=image.Width;
int nHeight=image.Height;
int red,green,blue;

int w0=(int)(nWidth/2);
int h0=(int)(nHeight/2);
int r0,t1,t2,kr=r,kg=g,kb=b;
double z,z0;

int k1r=r,k1g=g,k1b=b,
k2r=r,k2g=g,k2b=b,
k3r=r,k3g=g,k3b=b,
k4r=r,k4g=g,k4b=b;

if(w0>h0)
r0=w0;
else
r0=h0;
z0=Math.Sqrt(w0*w0+h0*h0);
z0=z0/1.5;

for(int y=0;y<nHeight;++y)
{
for(int x=0; x < nWidth; ++x )
{
red=p[2];
green=p[1];
blue=p[0];

t1=x-w0;
t2=y-h0;

if(t1<0) t1=0-t1;
if(t2<0) t2=0-t2;

z=Math.Sqrt(t1*t1+t2*t2);
if(z<z0)
{
z=z0;
kr=0;
kg=0;
kb=0;
}
else
{
double xx=(z-z0)/z;
kr=(int)(15*r*xx*xx);
kg=(int)(15*g*xx*xx);
kb=(int)(15*b*xx*xx);
}
red+=kr;
green+=kg;
blue+=kb;

if(red>255) red=255;
if(red<0) red=0;
if(green>255) green=255;
if(green<0) green=0;
if(blue>255) blue=255;
if(blue<0) blue=0;

p[2]=(byte)red;
p[1]=(byte)green;
p[0]=(byte)blue;

p+=3;
}
p += nOffset;

}
}
image.UnlockBits(bmData);
return true;
}

/// <summary>
/// 反差圆补偿
/// </summary>
/// <param name="image">图像</param>
/// <param name="con">反差系数</param>
/// <param name="k">圆半径系数</param>
/// <returns></returns>
public static bool ccon(Bitmap image,float con,float k)
{
BitmapData bmData = image.LockBits(new Rectangle(0, 0,image.Width , image.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
unsafe
{
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - image.Width*3;

int nWidth=image.Width;
int nHeight=image.Height;
int red,green,blue;

int w0=(int)(nWidth/2);
int h0=(int)(nHeight/2);
int r0,t1,t2;
double z,z0,pixel,contrast;

if(w0>h0)
r0=w0;
else
r0=h0;
z0=Math.Sqrt(w0*w0+h0*h0);
z0=z0/k;

for(int y=0;y<nHeight;++y)
{
for(int x=0; x < nWidth; ++x )
{
red=p[2];
green=p[1];
blue=p[0];

t1=x-w0;
t2=y-h0;

if(t1<0) t1=0-t1;
if(t2<0) t2=0-t2;

z=Math.Sqrt(t1*t1+t2*t2);
if(z>z0)
{
contrast = (z-z0)/z * con ;

pixel = red-(127-red) * contrast;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[2] = (byte) pixel;

pixel = green-(127-green) * contrast;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[1] = (byte) pixel;

pixel = blue-(127-blue) * contrast;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[0] = (byte) pixel;
}
p+=3;
}
p += nOffset;
}
}
image.UnlockBits(bmData);
return true;
}
/// <summary>
/// 基本反差调整
/// </summary>
/// <param name="b"></param>
/// <param name="nContrast"></param>
/// <returns></returns>
public static bool Contrast(Bitmap b, int nContrast)
{
if (nContrast < -100) return false;
if (nContrast > 100) return false;

double pixel = 0, contrast = (100.0+nContrast)/100.0;

contrast *= contrast;

int red, green, blue;

// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
int h=b.Height,w=b.Width;

unsafe
{
byte * p = (byte *)(void *)Scan0;

int nOffset = stride - b.Width*3;

for(int y=0;y<h;++y)
{
for(int x=0; x < w; ++x )
{
blue = p[0];
green = p[1];
red = p[2];

pixel = red/255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[2] = (byte) pixel;

pixel = green/255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[1] = (byte) pixel;

pixel = blue/255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[0] = (byte) pixel;

p += 3;
}
p += nOffset;
}
}

b.UnlockBits(bmData);

return true;
}

public static bool zft(Bitmap b,out int[] all,out int[] rhow, out int[] ghow,out int[] bhow)
{
int [] gray=new int[256];
int [] rr = new int[256];
int [] gg = new int[256];
int [] bb = new int[256];
int tt=0;
foreach(int i in gray)
{
gray[i]=0;
}
foreach(int i in rr)
{
rr[i]=0;
}
foreach(int i in gg)
{
gg[i]=0;
}
foreach(int i in bb)
{
bb[i]=0;
}

// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;

unsafe
{
byte * p = (byte *)(void *)Scan0;

int nOffset = stride - b.Width*3;

byte red, green, blue;
int nWidth = b.Width;
int nHeight= b.Height;

for(int y=0;y<nHeight;++y)
{
for(int x=0; x < nWidth; ++x )
{
blue = p[0];
green = p[1];
red = p[2];

tt = (byte)(.299 * red + .587 * green + .114 * blue);
rr[red]++;
gg[green]++;
bb[blue]++;
gray[tt]++;
p += 3;
}
p += nOffset;
}
}
all=gray;
rhow=rr;
ghow=gg;
bhow=bb;

b.UnlockBits(bmData);

return true;
}

}
}

//直方图--------------------------------------------------------------------------

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace zft
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
private System.Windows.Forms.Button button1;

int [] gray=new int[256];
int [] rr = new int[256];
int [] gg = new int[256];
int [] bb = new int[256];
public Bitmap a=new Bitmap(500,500);
public Bitmap b=new Bitmap(500,500);
Pen pen1=new Pen(Color.Black);
int flag=0;

float count ;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Button button4;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label7;
private System.Windows.Forms.Label label8;
private System.Windows.Forms.Label label9;
private System.Windows.Forms.Label label10;
private System.Windows.Forms.Label l_sejie;
private System.Windows.Forms.Label l_pinjun;
private System.Windows.Forms.Label l_pixel;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox3;

float [] gl=new float[256];
private System.Windows.Forms.Label l_bfb;
private System.Windows.Forms.Label l_how;

private bool aline=false;
private System.Windows.Forms.Label lcolor;
private System.Windows.Forms.Label label5;
private System.Windows.Forms.Label label6;
private System.Windows.Forms.Label label11;
private System.Windows.Forms.GroupBox groupBox2;
private System.Windows.Forms.GroupBox groupBox4;
private System.Windows.Forms.Button button5;
private System.Windows.Forms.Button undo;
private System.Windows.Forms.Button refresh;

int xx=-1;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.button4 = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.button5 = new System.Windows.Forms.Button();
this.l_pinjun = new System.Windows.Forms.Label();
this.l_pixel = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.groupBox4 = new System.Windows.Forms.GroupBox();
this.groupBox2 = new System.Windows.Forms.GroupBox();
this.label11 = new System.Windows.Forms.Label();
this.label6 = new System.Windows.Forms.Label();
this.label5 = new System.Windows.Forms.Label();
this.lcolor = new System.Windows.Forms.Label();
this.textBox3 = new System.Windows.Forms.TextBox();
this.l_how = new System.Windows.Forms.Label();
this.l_bfb = new System.Windows.Forms.Label();
this.label10 = new System.Windows.Forms.Label();
this.label9 = new System.Windows.Forms.Label();
this.label8 = new System.Windows.Forms.Label();
this.label7 = new System.Windows.Forms.Label();
this.l_sejie = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.undo = new System.Windows.Forms.Button();
this.refresh = new System.Windows.Forms.Button();
this.groupBox1.SuspendLayout();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(276, 56);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(64, 28);
this.button1.TabIndex = 0;
this.button1.Text = "灰度";
this.button1.TextAlign = System.Drawing.ContentAlignment.BottomCenter;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(276, 92);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(64, 28);
this.button2.TabIndex = 1;
this.button2.Text = "红";
this.button2.TextAlign = System.Drawing.ContentAlignment.BottomCenter;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// button3
//
this.button3.Location = new System.Drawing.Point(276, 124);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(64, 28);
this.button3.TabIndex = 2;
this.button3.Text = "绿";
this.button3.TextAlign = System.Drawing.ContentAlignment.BottomCenter;
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// button4
//
this.button4.Location = new System.Drawing.Point(276, 156);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(64, 28);
this.button4.TabIndex = 3;
this.button4.Text = "蓝";
this.button4.TextAlign = System.Drawing.ContentAlignment.BottomCenter;
this.button4.Click += new System.EventHandler(this.button4_Click);
//
// label1
//
this.label1.BackColor = System.Drawing.Color.White;
this.label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label1.Cursor = System.Windows.Forms.Cursors.Cross;
this.label1.Location = new System.Drawing.Point(12, 56);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(258, 129);
this.label1.TabIndex = 4;
this.label1.Paint += new System.Windows.Forms.PaintEventHandler(this.label1_Paint);
this.label1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.label1_MouseUp);
this.label1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.label1_MouseMove);
this.label1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.label1_MouseDown);
//
// groupBox1
//
this.groupBox1.Controls.Add(this.button5);
this.groupBox1.Controls.Add(this.l_pinjun);
this.groupBox1.Controls.Add(this.l_pixel);
this.groupBox1.Controls.Add(this.textBox1);
this.groupBox1.Controls.Add(this.groupBox4);
this.groupBox1.Controls.Add(this.groupBox2);
this.groupBox1.Controls.Add(this.label11);
this.groupBox1.Controls.Add(this.label6);
this.groupBox1.Controls.Add(this.label5);
this.groupBox1.Controls.Add(this.lcolor);
this.groupBox1.Controls.Add(this.textBox3);
this.groupBox1.Controls.Add(this.l_how);
this.groupBox1.Controls.Add(this.l_bfb);
this.groupBox1.Controls.Add(this.label10);
this.groupBox1.Controls.Add(this.label9);
this.groupBox1.Controls.Add(this.label8);
this.groupBox1.Controls.Add(this.label7);
this.groupBox1.Controls.Add(this.l_sejie);
this.groupBox1.Controls.Add(this.label3);
this.groupBox1.Controls.Add(this.label1);
this.groupBox1.Controls.Add(this.button2);
this.groupBox1.Controls.Add(this.button3);
this.groupBox1.Controls.Add(this.button1);
this.groupBox1.Controls.Add(this.button4);
this.groupBox1.Controls.Add(this.label2);
this.groupBox1.Font = new System.Drawing.Font("宋体", 12F);
this.groupBox1.Location = new System.Drawing.Point(8, 4);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(352, 340);
this.groupBox1.TabIndex = 5;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "直方图";
this.groupBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.groupBox1_Paint);
//
// button5
//
this.button5.Location = new System.Drawing.Point(276, 224);
this.button5.Name = "button5";
this.button5.Size = new System.Drawing.Size(64, 24);
this.button5.TabIndex = 26;
this.button5.Text = "ok";
this.button5.Click += new System.EventHandler(this.button5_Click);
//
// l_pinjun
//
this.l_pinjun.Location = new System.Drawing.Point(76, 292);
this.l_pinjun.Name = "l_pinjun";
this.l_pinjun.Size = new System.Drawing.Size(88, 20);
this.l_pinjun.TabIndex = 8;
this.l_pinjun.Text = "0";
this.l_pinjun.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// l_pixel
//
this.l_pixel.Location = new System.Drawing.Point(76, 272);
this.l_pixel.Name = "l_pixel";
this.l_pixel.Size = new System.Drawing.Size(88, 20);
this.l_pixel.TabIndex = 9;
this.l_pixel.Text = "0";
this.l_pixel.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(124, 224);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(48, 26);
this.textBox1.TabIndex = 16;
this.textBox1.Text = "0";
//
// groupBox4
//
this.groupBox4.Location = new System.Drawing.Point(176, 228);
this.groupBox4.Name = "groupBox4";
this.groupBox4.Size = new System.Drawing.Size(44, 8);
this.groupBox4.TabIndex = 25;
this.groupBox4.TabStop = false;
//
// groupBox2
//
this.groupBox2.Location = new System.Drawing.Point(176, 32);
this.groupBox2.Name = "groupBox2";
this.groupBox2.Size = new System.Drawing.Size(40, 8);
this.groupBox2.TabIndex = 24;
this.groupBox2.TabStop = false;
//
// label11
//
this.label11.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label11.Location = new System.Drawing.Point(220, 28);
this.label11.Name = "label11";
this.label11.Size = new System.Drawing.Size(52, 23);
this.label11.TabIndex = 23;
this.label11.Text = "255";
this.label11.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// label6
//
this.label6.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label6.Location = new System.Drawing.Point(124, 28);
this.label6.Name = "label6";
this.label6.Size = new System.Drawing.Size(48, 23);
this.label6.TabIndex = 22;
this.label6.Text = "0";
this.label6.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// label5
//
this.label5.Location = new System.Drawing.Point(8, 224);
this.label5.Name = "label5";
this.label5.Size = new System.Drawing.Size(116, 23);
this.label5.TabIndex = 21;
this.label5.Text = "输出色阶范围:";
//
// lcolor
//
this.lcolor.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lcolor.Location = new System.Drawing.Point(12, 192);
this.lcolor.Name = "lcolor";
this.lcolor.Size = new System.Drawing.Size(260, 12);
this.lcolor.TabIndex = 19;
this.lcolor.Paint += new System.Windows.Forms.PaintEventHandler(this.lcolor_Paint);
//
// textBox3
//
this.textBox3.Location = new System.Drawing.Point(224, 224);
this.textBox3.Name = "textBox3";
this.textBox3.Size = new System.Drawing.Size(48, 26);
this.textBox3.TabIndex = 18;
this.textBox3.Text = "255";
//
// l_how
//
this.l_how.Location = new System.Drawing.Point(212, 292);
this.l_how.Name = "l_how";
this.l_how.Size = new System.Drawing.Size(120, 20);
this.l_how.TabIndex = 15;
this.l_how.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// l_bfb
//
this.l_bfb.Location = new System.Drawing.Point(208, 312);
this.l_bfb.Name = "l_bfb";
this.l_bfb.Size = new System.Drawing.Size(124, 20);
this.l_bfb.TabIndex = 14;
this.l_bfb.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// label10
//
this.label10.Location = new System.Drawing.Point(144, 312);
this.label10.Name = "label10";
this.label10.Size = new System.Drawing.Size(68, 20);
this.label10.TabIndex = 13;
this.label10.Text = "百分比:";
this.label10.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// label9
//
this.label9.Location = new System.Drawing.Point(16, 28);
this.label9.Name = "label9";
this.label9.Size = new System.Drawing.Size(84, 23);
this.label9.TabIndex = 12;
this.label9.Text = "色阶范围:";
//
// label8
//
this.label8.Location = new System.Drawing.Point(4, 292);
this.label8.Name = "label8";
this.label8.Size = new System.Drawing.Size(68, 20);
this.label8.TabIndex = 11;
this.label8.Text = "平均值:";
this.label8.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// label7
//
this.label7.Location = new System.Drawing.Point(144, 272);
this.label7.Name = "label7";
this.label7.Size = new System.Drawing.Size(68, 20);
this.label7.TabIndex = 10;
this.label7.Text = "色阶:";
this.label7.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// l_sejie
//
this.l_sejie.Location = new System.Drawing.Point(212, 272);
this.l_sejie.Name = "l_sejie";
this.l_sejie.Size = new System.Drawing.Size(120, 20);
this.l_sejie.TabIndex = 7;
this.l_sejie.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// label3
//
this.label3.Location = new System.Drawing.Point(152, 292);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(60, 20);
this.label3.TabIndex = 6;
this.label3.Text = "数量:";
this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// label2
//
this.label2.Location = new System.Drawing.Point(16, 272);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(56, 20);
this.label2.TabIndex = 5;
this.label2.Text = "像素:";
this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// undo
//
this.undo.Location = new System.Drawing.Point(368, 16);
this.undo.Name = "undo";
this.undo.TabIndex = 6;
this.undo.Text = "undo";
this.undo.Click += new System.EventHandler(this.undo_Click);
//
// refresh
//
this.refresh.Location = new System.Drawing.Point(368, 48);
this.refresh.Name = "refresh";
this.refresh.TabIndex = 7;
this.refresh.Text = "refresh";
this.refresh.Click += new System.EventHandler(this.refresh_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(450, 350);
this.Controls.Add(this.refresh);
this.Controls.Add(this.undo);
this.Controls.Add(this.groupBox1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.Name = "Form1";
this.Text = "色阶和直方图";
this.Load += new System.EventHandler(this.Form1_Load);
this.groupBox1.ResumeLayout(false);
this.ResumeLayout(false);

}
#endregion

private void Form1_Load(object sender, System.EventArgs e)
{
this.TopMost=true;
this.Left=800;
BitmapFilter.zft(a,out gray,out rr,out gg, out bb);
graydo();
this.Invalidate();
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint (e);
Graphics g=e.Graphics;
}

private void button1_Click(object sender, System.EventArgs e)
{
graydo();
}
private void graydo()
{
this.flag=1;
count = a.Width * a.Height;
gl=new float[256];
for(int i=0;i<256; i++)
gl[i]= gray[i]/count *10000;
pen1=Pens.Black;
this.label1.Invalidate();
this.lcolor.Invalidate();
}

private void button2_Click(object sender, System.EventArgs e)
{
this.flag=2;
count = a.Width * a.Height;
gl=new float[256];
for(int i=0;i<256; i++)
gl[i]= rr[i]/count *10000;
pen1=Pens.Red;
this.label1.Invalidate();
this.lcolor.Invalidate();
}

private void button3_Click(object sender, System.EventArgs e)
{
this.flag=3;
count = a.Width * a.Height;
gl=new float[256];
for(int i=0;i<256; i++)
gl[i]= gg[i]/count *10000;
pen1=Pens.Green;
this.label1.Invalidate();
this.lcolor.Invalidate();
}

private void button4_Click(object sender, System.EventArgs e)
{
this.flag=4;
count = a.Width * a.Height;
gl=new float[256];
for(int i=0;i<256; i++)
gl[i]= bb[i]/count *10000;
pen1=Pens.Blue;
this.label1.Invalidate();
this.lcolor.Invalidate();
}

private void label1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g=e.Graphics;
int p;
p= a.Width*a.Height;
this.l_pixel.Text=p.ToString();

int height =this.label1.Height;
for(int j=0;j<256;j++)
{
if(gl[j]>height)
gl[j]=height;
g.DrawLine(pen1,j,height,j,height-gl[j]);
}
if(aline)
{
g.DrawLine(Pens.OrangeRed,xx,0,xx,height);
}
if(xx!=-1)
{
this.l_sejie.Text =xx.ToString();
this.l_how.Text =this.gray[xx].ToString();
this.l_bfb.Text =this.gl[xx].ToString();
}
else
{
this.l_sejie.Text=" ";
this.l_how.Text =" ";
this.l_bfb.Text =" ";
}
}

private void label1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
xx=e.X;
if(xx>255)
xx=255;
if(xx<=0)
xx=0;

aline=true;
this.label1.Invalidate();
}

private void label1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
/*
if((e.X>255)&&(e.X<0)&&(e.Y<0)&&(e.Y>127))
{
this.xx=-1;
}
else
{
this.xx=e.X;
}
this.label4.Text=e.X.ToString()+" "+e.Y.ToString();
*/
Point p=new Point(e.X,e.Y);
if(new Rectangle(0,0,256,127).Contains(p))
{
this.xx=e.X;
}
else
{
this.xx=-1;
}

this.label1.Invalidate();
}

private void label1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
aline=false;
}

private void lcolor_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
int width=this.lcolor.Width;
int height=this.lcolor.Height;
int j;
Color c;
Graphics g=e.Graphics;

switch(flag)
{
case 1:
{
for(int i=width;i>=0;i--)
{
j=i;
if(j>255) j=255;
c=Color.FromArgb(j,j,j);
Pen pen2=new Pen(c,1);
g.DrawLine(pen2,i,0,i,height);
}
break;
}
case 2:
{
for(int i=width;i>=0;i--)
{
j=i;
if(j>255) j=255;
c=Color.FromArgb(j,0,0);
Pen pen2=new Pen(c,1);
g.DrawLine(pen2,i,0,i,height);
}
break;
}
case 3:
{
for(int i=width;i>=0;i--)
{
j=i;
if(j>255) j=255;
c=Color.FromArgb(0,j,0);
Pen pen2=new Pen(c,1);
g.DrawLine(pen2,i,0,i,height);
}
break;
}
case 4:
{
for(int i=width;i>=0;i--)
{
j=i;
if(j>255) j=255;
c=Color.FromArgb(0,0,j);
Pen pen2=new Pen(c,1);
g.DrawLine(pen2,i,0,i,height);
}
break;
}
default:
break;

}
}

private void groupBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g=e.Graphics;
int x=this.lcolor.Left;
int y=this.lcolor.Top;
int w=this.lcolor.Width;
int h=this.lcolor.Height;

PointF [] pp=new PointF [4];
pp[0]=new PointF(x ,y+h+5);
pp[1]=new PointF(x-5 ,y+h+15);
pp[2]=new PointF(x+5 ,y+h+15);
pp[3]=new PointF(x ,y+h+5);

g.FillPolygon(Brushes.Black,pp);

x+=w/2;

pp[0]=new PointF(x ,y+h+5);
pp[1]=new PointF(x-5 ,y+h+15);
pp[2]=new PointF(x+5 ,y+h+15);
pp[3]=new PointF(x ,y+h+5);

g.FillPolygon(Brushes.Gray,pp);

x+=w/2;

pp[0]=new PointF(x ,y+h+5);
pp[1]=new PointF(x-5 ,y+h+15);
pp[2]=new PointF(x+5 ,y+h+15);
pp[3]=new PointF(x ,y+h+5);

g.FillPolygon(Brushes.Black,pp);
}

private void button5_Click(object sender, System.EventArgs e)
{
int a1=Convert.ToInt32(this.textBox1.Text);
int a2=Convert.ToInt32(this.textBox3.Text);
}

private void undo_Click(object sender, System.EventArgs e)
{
this.a=(Bitmap)this.b.Clone();
}

private void refresh_Click(object sender, System.EventArgs e)
{
doing();
}
public void doing()
{
BitmapFilter.zft(a,out gray,out rr,out gg, out bb);
graydo();
this.Invalidate();
}
}
}
//有点累，呵呵！