目錄
1.背景透明化
2.指定顔色透明化
3.指定顔色替換成另一種顔色
4.圖檔按比例縮放
5.圖檔旋轉
6.圖檔更改透明度
7.圖檔添加文字
8.圖檔添加小圖
9.橫向合并兩張圖檔
10.縱向合并兩張圖檔
11.圖檔切割
以下的代碼都經過測試通過了的
1. 背景透明化
背景透明化
/// <summary>
/// 背景透明化
/// </summary>
/// <param name="img">原圖</param>
/// <param name="w">圖檔寬度</param>
/// <param name="h">圖檔高度</param>
/// <returns></returns>
public static Bitmap Conver_1(Bitmap img, int w, int h)
{
Bitmap bg = new Bitmap(w, h);
int alpha = 0;
Color demo;
Color pixel;
for (int x = 0; x < w; x++)
{
for (int y = 0; y < h; y++)
{
demo = img.GetPixel(1, 1);
pixel = img.GetPixel(x, y);
int R = demo.R;
int G = demo.G;
int B = demo.B;
int r1 = pixel.R;
int g1 = pixel.G;
int b1 = pixel.B;
int a = 40; //RGB誤差範圍
if (Math.Abs(R - r1) < a && Math.Abs(G - g1) < a && Math.Abs(B - b1) < a)
{
alpha = 0; //RGB在色差範圍内,透明度為0
}
else
{
alpha = 255;
}
bg.SetPixel(x, y, Color.FromArgb(alpha, r1, g1, b1));
}
}
return bg;
}
2.指定顔色透明化
/// <summary>
/// 指定顔色透明化
/// </summary>
/// <param name="img">原圖</param>
/// <param name="w">原圖寬度</param>
/// <param name="h">原圖高度</param>
/// <param name="R">指定顔色RGB的R值</param>
/// <param name="G">指定顔色RGB的G值</param>
/// <param name="B">指定顔色RGB的B值</param>
/// <returns></returns>
public static Bitmap Conver_2(Bitmap img, int w, int h, int R, int G, int B)
{
Bitmap bg = new Bitmap(w, h);
int alpha = 0;
Color pixel;
for (int x = 0; x < w; x++)
{
for (int y = 0; y < h; y++)
{
pixel = img.GetPixel(x, y);
int r1 = pixel.R;
int g1 = pixel.G;
int b1 = pixel.B;
int a = 40; //色差範圍值
if (Math.Abs(R - r1) < a && Math.Abs(G - g1) < a && Math.Abs(B - b1) < a)
{
alpha = 0; //若兩種顔色比較接近,透明度設為0
}
else
{
alpha = 255;
}
bg.SetPixel(x, y, Color.FromArgb(alpha, r1, g1, b1));
}
}
return bg;
}
3.指定顔色替換成另一種顔色
/// <summary>
/// 指定顔色替換成另一種顔色
/// </summary>
/// <param name="img">原圖</param>
/// <param name="w">圖寬</param>
/// <param name="h">圖高</param>
/// <param name="R">要被替換顔色的RGB的R</param>
/// <param name="G">要被替換顔色的RGB的G</param>
/// <param name="B">要被替換顔色的RGB的B</param>
/// <param name="r">替換色的RGB的R</param>
/// <param name="g">替換色的RGB的G</param>
/// <param name="b">替換色的RGB的B</param>
/// <returns></returns>
public static Bitmap Conver_3(Bitmap img, int w, int h, int R, int G, int B, int r, int g, int b)
{
Bitmap bg = new Bitmap(w, h);
Color pixel;
for (int x = 0; x < w; x++)
{
for (int y = 0; y < h; y++)
{
pixel = img.GetPixel(x, y);
int r1 = pixel.R;
int g1 = pixel.G;
int b1 = pixel.B;
int a = 40;
if (Math.Abs(R - r1) < a && Math.Abs(G - g1) < a && Math.Abs(B - b1) < a)
{
bg.SetPixel(x, y, Color.FromArgb(r, g, b));
}
else
{
bg.SetPixel(x, y, Color.FromArgb(r1, g1, b1));
}
}
}
return bg;
}
4.圖檔按比例縮放
/// <summary>
/// 圖檔按比例縮放
/// </summary>
/// <param name="SourceImage">目标圖檔</param>
/// <param name="a">縮放的比例</param>
/// <returns></returns>
public static Image PictureHandle1(Image SourceImage, float a)
{
int W; //縮放後圖檔的寬
int H; //縮放後圖檔的高
W = (int)(a * SourceImage.Width);
H = (int)(a * SourceImage.Height);
try
{
ImageFormat format = SourceImage.RawFormat;
Bitmap SaveImage = new Bitmap(W, H);
Graphics g = Graphics.FromImage(SaveImage);
g.Clear(Color.White);
g.DrawImage(SourceImage, 0, 0, W, H);
SourceImage.Dispose();
return SaveImage;
}
catch (Exception e)
{
}
return null;
}
5.圖檔旋轉
/// <summary>
/// 圖檔旋轉
/// </summary>
/// <param name="b">原圖</param>
/// <param name="savePath">旋轉後儲存路徑</param>
/// <param name="angle">旋轉角度</param>
public static void RotateImage(Image b, string savePath, float angle)
{
angle = angle % 360; //弧度轉換
double radian = angle * Math.PI / 180.0;
double cos = Math.Cos(radian);
double sin = Math.Sin(radian);
//原圖的寬和高
int w = b.Width;
int h = b.Height;
int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));
int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));
//目标位圖
Image dsImage = new Bitmap(W, H);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//計算偏移量
Point Offset = new Point((W - w) / 2, (H - h) / 2);
//構造圖像顯示區域:讓圖像的中心與視窗的中心點一緻
Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);
Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
g.TranslateTransform(center.X, center.Y);
g.RotateTransform(360 - angle);
//恢複圖像在水準和垂直方向的平移
g.TranslateTransform(-center.X, -center.Y);
g.DrawImage(b, rect);
//重至繪圖的所有變換
g.ResetTransform();
g.Save();
g.Dispose();
string extension = Path.GetExtension(savePath);
if (extension == ".jpg")
{
MessageBox.Show("圖檔儲存不是png格式,旋轉效果有誤!請重新選擇儲存格式!");
}
else
{
dsImage.Save(savePath, ImageFormat.Png);
MessageBox.Show("圖檔旋轉成功!");
}
}
6.圖檔更改透明度
/// <summary>
/// 圖檔更改透明度
/// </summary>
/// <param name="waterPic">水印圖</param>
/// <param name="alpha">透明度值 0—255</param>
/// <returns></returns>
public static Image ChangeAlpha(Image waterPic, int alpha)
{
Bitmap img = new Bitmap(waterPic);
using (Bitmap bmp = new Bitmap(img.Width, img.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
{
using (Graphics g = Graphics.FromImage(bmp))
{
g.DrawImage(img, 0, 0);
for (int h = 0; h < img.Height; h++)
{
for (int w = 0; w < img.Width; w++)
{
Color color = img.GetPixel(w, h);
bmp.SetPixel(w, h, Color.FromArgb(alpha, color.R, color.G, color.B));
}
}
return (Image)bmp.Clone();
}
}
}
7.圖檔添加文字
/// <summary>
/// 圖檔添加文字
/// </summary>
/// <param name="template">模闆路徑</param>
/// <param name="savePath">儲存路徑</param>
/// <param name="text">文字内容</param>
/// <param name="font">字型</param>
/// <param name="color">字型顔色</param>
/// <param name="x">文字添加位置的起始坐标X</param>
/// <param name="y">文字添加位置的起始坐标Y</param>
public static void templateAddText(string template, string savePath, string text, Font font, Color color, int x, int y)
{
Image image = Image.FromFile(template);
Bitmap bt = new Bitmap(image, image.Width, image.Height);
Graphics g = Graphics.FromImage(bt);
Font f = font;
Brush b = new SolidBrush(color);
g.DrawString(text, f, b, x, y);
string extension = Path.GetExtension(savePath);
if (extension == ".jpg")
{
bt.Save(savePath, ImageFormat.Jpeg);
}
else
{
bt.Save(savePath, ImageFormat.Png);
}
}
8.圖檔添加小圖
/// <summary>
/// 圖檔添加小圖
/// </summary>
/// <param name="template">模闆圖路徑</param>
/// <param name="pic">小圖路徑</param>
/// <param name="savePath">儲存路徑</param>
/// <param name="x">小圖添加位置起始坐标X</param>
/// <param name="y">小圖添加位置起始坐标Y</param>
public static void TemplateAddPicture(string template, string pic, string savePath, int x, int y)
{
Image image = Image.FromFile(template);
Bitmap bt = new Bitmap(image, image.Width, image.Height);
Image picture = Image.FromFile(pic);
Bitmap small = new Bitmap(picture, picture.Width, picture.Height);
Graphics g = Graphics.FromImage(bt);
g.DrawImage(small, x, y, picture.Width, picture.Height);
string extension = Path.GetExtension(savePath);
if (extension == ".jpg")
{
bt.Save(savePath, ImageFormat.Jpeg);
}
else
{
bt.Save(savePath, ImageFormat.Png);
}
}
9.橫向合并兩張圖檔
/// <summary>
/// 橫向合并兩張圖檔
/// </summary>
/// <param name="pic1">左圖檔案的路徑</param>
/// <param name="pic2">右圖的檔案路徑</param>
/// <param name="savePath">合成圖檔儲存路徑</param>
public static void H_merge(string pic1, string pic2, string savePath)
{
Image img1 = Image.FromFile(pic1);
Image img2 = Image.FromFile(pic2);
Bitmap L = new Bitmap(img1, img1.Width, img1.Height);
Bitmap R = new Bitmap(img2, img2.Width, img2.Height);
if (img2.Height == img1.Height)
{
Bitmap bg = new Bitmap(img1.Width + img2.Width, img1.Height);
Graphics g = Graphics.FromImage(bg);
g.DrawImage(L, 0, 0, img1.Width, img1.Height);
g.DrawImage(R, img1.Width, 0, img2.Width, img2.Height);
g.Dispose();
string extension = Path.GetExtension(savePath);
if (extension == ".jpg")
{
bg.Save(savePath, ImageFormat.Jpeg);
}
else
{
bg.Save(savePath, ImageFormat.Png);
}
MessageBox.Show("圖檔合成成功!");
}
else
{
MessageBox.Show("兩張圖檔的高度不一緻,請重新選擇!");
}
}
10.縱向合并兩張圖檔
/// <summary>
/// 縱向合并兩張圖檔
/// </summary>
/// <param name="pic1">上圖檔案的路徑</param>
/// <param name="pic2">下圖的檔案路徑</param>
/// <param name="savePath">合成圖檔儲存路徑</param>
public static void Z_merge(string pic1, string pic2, string savePath)
{
Image img1 = Image.FromFile(pic1);
Image img2 = Image.FromFile(pic2);
Bitmap L = new Bitmap(img1, img1.Width, img1.Height);
Bitmap R = new Bitmap(img2, img2.Width, img2.Height);
if (img2.Width == img1.Width)
{
Bitmap bg = new Bitmap(img1.Width, img1.Height + img2.Height);
Graphics g = Graphics.FromImage(bg);
g.DrawImage(L, 0, 0, img1.Width, img1.Height);
g.DrawImage(R, 0, img1.Height, img2.Width, img2.Height);
g.Dispose();
string extension = Path.GetExtension(savePath);
if (extension == ".jpg")
{
bg.Save(savePath, ImageFormat.Jpeg);
}
else
{
bg.Save(savePath, ImageFormat.Png);
}
MessageBox.Show("圖檔合成成功!");
}
else
{
MessageBox.Show("兩張圖檔的寬度不一緻,請重新選擇!");
}
}
11.圖檔切割
/// <summary>
/// 圖檔切割
/// </summary>
/// <param name="template">原圖路徑</param>
/// <param name="savePath">切割圖儲存路徑</param>
/// <param name="x">切割起始位置的坐标X</param>
/// <param name="y">切割起始位置的坐标Y</param>
/// <param name="w">切割寬度</param>
/// <param name="h">切割高度</param>
public static void pic_cut(string template, string savePath, int x, int y, int w, int h)
{
Image image = Image.FromFile(template);
Bitmap b = new Bitmap(image, image.Width, image.Height);
Bitmap bmpOut = new Bitmap(w, h, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bmpOut);
g.DrawImage(b, new Rectangle(0, 0, w, h), new Rectangle(x, y, w, h), GraphicsUnit.Pixel);
g.Dispose();
string extension = Path.GetExtension(savePath);
if (extension == ".jpg")
{
bmpOut.Save(savePath, ImageFormat.Jpeg);
}
else
{
bmpOut.Save(savePath, ImageFormat.Png);
}
}
背景透明的png格式的圖檔旋轉後作為水印貼圖檔上有黑色效果,有風險