asp.net的图片效果处理
asp.net实现图片的几种效果：底片效果 浮雕效果 黑白效果 柔化效果 锐化效果 雾化效果 光照效果（根据别人写的代码改写的，有几个效果没搞定）
前台页面代码：
Code<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Picture_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Image ID="pictureBox1" runat="server" ImageUrl="boy.jpg" />
<asp:Image ID="Image1" runat="server" />
</div>
<div>
<asp:Button ID="Button1" runat="server" Text="底片效果" onclick="Button1_Click" />
<asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="浮雕效果" />
<asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="黑白效果" />
<asp:Button ID="Button4" runat="server" onclick="Button4_Click" Text="柔化效果" />
<asp:Button ID="Button5" runat="server" onclick="Button5_Click" Text="锐化效果" />
<asp:Button ID="Button6" runat="server" onclick="Button6_Click" Text="雾化效果" />
<asp:Button ID="Button7" runat="server" onclick="Button7_Click" Text="光照效果" />
</div>
<div>
<asp:Label ID="lblMsg" runat="server"></asp:Label></div>
</form>
</body>
</html>
CS代码：
Codeusing System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
public partial class Picture_Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
//以底片效果显示图像
try
{
System.Drawing.Bitmap img = new Bitmap(Server.MapPath("boy.jpg"));
int Height = img.Height;
int Width = img.Width;
Bitmap newBitmap = new Bitmap(Width, Height);
Bitmap oldbitmap = img;
Color pixel;
for (int x = 1; x < Width; x++)
{
for (int y = 1; y < Height; y++)
{
int r, g, b;
pixel = oldbitmap.GetPixel(x, y);
r = 255 - pixel.R;
g = 255 - pixel.G;
b = 255 - pixel.B;
newBitmap.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
newBitmap.Save(Server.MapPath("boy_ex.jpg"));
this.Image1.ImageUrl = "boy_ex.jpg";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
protected void Button2_Click(object sender, EventArgs e)
{
//以浮雕效果显示图像
try
{
System.Drawing.Bitmap img = new Bitmap(Server.MapPath("boy.jpg"));
int Height = img.Height;
int Width = img.Width;
Bitmap newBitmap = new Bitmap(Width, Height);
Bitmap oldBitmap = img;
Color pixel1, pixel2;
for (int x = 0; x < Width - 1; x++)
{
for (int y = 0; y < Height - 1; y++)
{
int r = 0, g = 0, b = 0;
pixel1 = oldBitmap.GetPixel(x, y);
pixel2 = oldBitmap.GetPixel(x + 1, y + 1);
r = Math.Abs(pixel1.R - pixel2.R + 128);
g = Math.Abs(pixel1.G - pixel2.G + 128);
b = Math.Abs(pixel1.B - pixel2.B + 128);
if (r > 255)
r = 255;
if (r < 0)
r = 0;
if (g > 255)
g = 255;
if (g < 0)
g = 0;
if (b > 255)
b = 255;
if (b < 0)
b = 0;
newBitmap.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
newBitmap.Save(Server.MapPath("boy_ex.jpg"));
this.Image1.ImageUrl = "boy_ex.jpg";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
protected void Button3_Click(object sender, EventArgs e)
{
//以黑白效果显示图像
try
{
System.Drawing.Bitmap img = new Bitmap(Server.MapPath("boy.jpg"));
int Height = img.Height;
int Width = img.Width;
Bitmap newBitmap = new Bitmap(Width, Height);
Bitmap oldBitmap = img;
Color pixel;
for (int x = 0; x < Width; x++)
for (int y = 0; y < Height; y++)
{
pixel = oldBitmap.GetPixel(x, y);
int r, g, b, Result = 0;
r = pixel.R;
g = pixel.G;
b = pixel.B;
//实例程序以加权平均值法产生黑白图像
int iType = 2;
switch (iType)
{
case 0://平均值法
Result = ((r + g + b) / 3);
break;
case 1://最大值法
Result = r > g ? r : g;
Result = Result > b ? Result : b;
break;
case 2://加权平均值法
Result = ((int)(0.7 * r) + (int)(0.2 * g) + (int)(0.1 * b));
break;
}
newBitmap.SetPixel(x, y, Color.FromArgb(Result, Result, Result));
}
newBitmap.Save(Server.MapPath("boy_ex.jpg"));
this.Image1.ImageUrl = "boy_ex.jpg";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
protected void Button4_Click(object sender, EventArgs e)
{
//以柔化效果显示图像
try
{
System.Drawing.Bitmap img = new Bitmap(Server.MapPath("boy.jpg"));
int Height = img.Height;
int Width = img.Width;
Bitmap newBitmap = new Bitmap(Width, Height);
Bitmap oldBitmap = img;
Color pixel;
//高斯模板
int[] Gauss = { 1, 2, 1, 2, 4, 2, 1, 2, 1 };
for (int x = 1; x < Width - 1; x++)
for (int y = 1; y < Height - 1; y++)
{
int r = 0, g = 0, b = 0;
int Index = 0;
for (int col = -1; col <= 1; col++)
for (int row = -1; row <= 1; row++)
{
pixel = oldBitmap.GetPixel(x + row, y + col);
r += pixel.R * Gauss[Index];
g += pixel.G * Gauss[Index];
b += pixel.B * Gauss[Index];
Index++;
}
r /= 16;
g /= 16;
b /= 16;
//处理颜色值溢出
r = r > 255 ? 255 : r;
r = r < 0 ? 0 : r;
g = g > 255 ? 255 : g;
g = g < 0 ? 0 : g;
b = b > 255 ? 255 : b;
b = b < 0 ? 0 : b;
newBitmap.SetPixel(x - 1, y - 1, Color.FromArgb(r, g, b));
}
newBitmap.Save(Server.MapPath("boy_ex.jpg"));
this.Image1.ImageUrl = "boy_ex.jpg";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
protected void Button5_Click(object sender, EventArgs e)
{
//以锐化效果显示图像
try
{
System.Drawing.Bitmap img = new Bitmap(Server.MapPath("boy.jpg"));
int Height = img.Height;
int Width = img.Width;
Bitmap newBitmap = new Bitmap(Width, Height);
Bitmap oldBitmap = img;
Color pixel;
//拉普拉斯模板
int[] Laplacian = { -1, -1, -1, -1, 9, -1, -1, -1, -1 };
for (int x = 1; x < Width - 1; x++)
for (int y = 1; y < Height - 1; y++)
{
int r = 0, g = 0, b = 0;
int Index = 0;
for (int col = -1; col <= 1; col++)
for (int row = -1; row <= 1; row++)
{
pixel = oldBitmap.GetPixel(x + row, y + col); r += pixel.R * Laplacian[Index];
g += pixel.G * Laplacian[Index];
b += pixel.B * Laplacian[Index];
Index++;
}
//处理颜色值溢出
r = r > 255 ? 255 : r;
r = r < 0 ? 0 : r;
g = g > 255 ? 255 : g;
g = g < 0 ? 0 : g;
b = b > 255 ? 255 : b;
b = b < 0 ? 0 : b;
newBitmap.SetPixel(x - 1, y - 1, Color.FromArgb(r, g, b));
}
newBitmap.Save(Server.MapPath("boy_ex.jpg"));
this.Image1.ImageUrl = "boy_ex.jpg";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
protected void Button6_Click(object sender, EventArgs e)
{
//以雾化效果显示图像
try
{
System.Drawing.Bitmap img = new Bitmap(Server.MapPath("boy.jpg"));
int Height = img.Height;
int Width = img.Width;
Bitmap newBitmap = new Bitmap(Width, Height);
Bitmap oldBitmap = img;
Color pixel;
for (int x = 1; x < Width - 1; x++)
for (int y = 1; y < Height - 1; y++)
{
System.Random MyRandom = new Random();
int k = MyRandom.Next(123456);
//像素块大小
int dx = x + k % 19;
int dy = y + k % 19;
if (dx >= Width)
dx = Width - 1;
if (dy >= Height)
dy = Height - 1;
pixel = oldBitmap.GetPixel(dx, dy);
newBitmap.SetPixel(x, y, pixel);
}
newBitmap.Save(Server.MapPath("boy_ex.jpg"));
this.Image1.ImageUrl = "boy_ex.jpg";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
protected void Button7_Click(object sender, EventArgs e)
{
//以光照效果显示图像
System.Drawing.Bitmap img = new Bitmap(Server.MapPath("boy.jpg"));
int Height = img.Height;
int Width = img.Width;
Bitmap newBitmap = img;
int A = Width / 2;
int B = Height / 2;
//MyCenter图片中心点，发亮此值会让强光中心发生偏移
Point MyCenter = new Point(Width / 2, Height / 2);
//R强光照射面的半径，即”光晕”
int R = Math.Min(Width / 2, Height / 2);
for (int i = Width - 1; i >= 1; i--)
{
for (int j = Height - 1; j >= 1; j--)
{
float MyLength = (float)Math.Sqrt(Math.Pow((i - MyCenter.X), 2) + Math.Pow((j - MyCenter.Y), 2));
//如果像素位于”光晕”之内
if (MyLength < R)
{
Color MyColor = newBitmap.GetPixel(i, j);
int r, g, b;
//220亮度增加常量，该值越大，光亮度越强
float MyPixel = 220.0f * (1.0f - MyLength / R);
r = MyColor.R + (int)MyPixel;
r = Math.Max(0, Math.Min(r, 255));
g = MyColor.G + (int)MyPixel;
g = Math.Max(0, Math.Min(g, 255));
b = MyColor.B + (int)MyPixel;
b = Math.Max(0, Math.Min(b, 255));
//将增亮后的像素值回写到位图
Color MyNewColor = Color.FromArgb(255, r, g, b);
newBitmap.SetPixel(i, j, MyNewColor);
}
}
//重新绘制图片
newBitmap.Save(Server.MapPath("boy_ex.jpg"));
this.Image1.ImageUrl = "boy_ex.jpg";
}
}
}
