目录
以下的代码都经过测试通过了的
1.背景透明化
/// <summary>
/// 背景透明化
/// </summary>
/// <param name="img">原图</param>
/// <param name="w">图片宽度</param>
/// <param name="h">图片高度</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误差范围
if (Math.Abs(R - r1) < a && Math.Abs(G - g1) < a && Math.Abs(B - b1) < a)
{
alpha = 0; //RGB在色差范围内，透明度为0
}
else
{
alpha = 255;
}
bg.SetPixel(x, y, Color.FromArgb(alpha, r1, g1, b1));
}
}
return bg;
}
2.指定颜色透明化
/// <summary>
/// 指定颜色透明化
/// </summary>
/// <param name="img">原图</param>
/// <param name="w">原图宽度</param>
/// <param name="h">原图高度</param>
/// <param name="R">指定颜色RGB的R值</param>
/// <param name="G">指定颜色RGB的G值</param>
/// <param name="B">指定颜色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; //色差范围值
if (Math.Abs(R - r1) < a && Math.Abs(G - g1) < a && Math.Abs(B - b1) < a)
{
alpha = 0; //若两种颜色比较接近，透明度设为0
}
else
{
alpha = 255;
}
bg.SetPixel(x, y, Color.FromArgb(alpha, r1, g1, b1));
}
}
return bg;
}3.指定颜色替换成另一种颜色
/// <summary>
/// 指定颜色替换成另一种颜色
/// </summary>
/// <param name="img">原图</param>
/// <param name="w">图宽</param>
/// <param name="h">图高</param>
/// <param name="R">要被替换颜色的RGB的R</param>
/// <param name="G">要被替换颜色的RGB的G</param>
/// <param name="B">要被替换颜色的RGB的B</param>
/// <param name="r">替换色的RGB的R</param>
/// <param name="g">替换色的RGB的G</param>
/// <param name="b">替换色的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.图片按比例缩放
/// <summary>
/// 图片按比例缩放
/// </summary>
/// <param name="SourceImage">目标图片</param>
/// <param name="a">缩放的比例</param>
/// <returns></returns>
public static Image PictureHandle1(Image SourceImage, float a)
{
int W; //缩放后图片的宽
int H; //缩放后图片的高
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.图片旋转
/// <summary>
/// 图片旋转
/// </summary>
/// <param name="b">原图</param>
/// <param name="savePath">旋转后保存路径</param>
/// <param name="angle">旋转角度</param>
public static void RotateImage(Image b, string savePath, float angle)
{
angle = angle % 360; //弧度转换
double radian = angle * Math.PI / 180.0;
double cos = Math.Cos(radian);
double sin = Math.Sin(radian);
//原图的宽和高
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)));
//目标位图
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;
//计算偏移量
Point Offset = new Point((W - w) / 2, (H - h) / 2);
//构造图像显示区域：让图像的中心与窗口的中心点一致
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);
//恢复图像在水平和垂直方向的平移
g.TranslateTransform(-center.X, -center.Y);
g.DrawImage(b, rect);
//重至绘图的所有变换
g.ResetTransform();
g.Save();
g.Dispose();
string extension = Path.GetExtension(savePath);
if (extension == ".jpg")
{
MessageBox.Show("图片保存不是png格式，旋转效果有误！请重新选择保存格式！");
}
else
{
dsImage.Save(savePath, ImageFormat.Png);
MessageBox.Show("图片旋转成功！");
}
}6.图片更改透明度
/// <summary>
/// 图片更改透明度
/// </summary>
/// <param name="waterPic">水印图</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.图片添加文字
/// <summary>
/// 图片添加文字
/// </summary>
/// <param name="template">模板路径</param>
/// <param name="savePath">保存路径</param>
/// <param name="text">文字内容</param>
/// <param name="font">字体</param>
/// <param name="color">字体颜色</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.图片添加小图
/// <summary>
/// 图片添加小图
/// </summary>
/// <param name="template">模板图路径</param>
/// <param name="pic">小图路径</param>
/// <param name="savePath">保存路径</param>
/// <param name="x">小图添加位置起始坐标X</param>
/// <param name="y">小图添加位置起始坐标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.横向合并两张图片
/// <summary>
/// 横向合并两张图片
/// </summary>
/// <param name="pic1">左图文件的路径</param>
/// <param name="pic2">右图的文件路径</param>
/// <param name="savePath">合成图片保存路径</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("图片合成成功!");
}
else
{
MessageBox.Show("两张图片的高度不一致，请重新选择！");
}
}10.纵向合并两张图片
/// <summary>
/// 纵向合并两张图片
/// </summary>
/// <param name="pic1">上图文件的路径</param>
/// <param name="pic2">下图的文件路径</param>
/// <param name="savePath">合成图片保存路径</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("图片合成成功!");
}
else
{
MessageBox.Show("两张图片的宽度不一致，请重新选择！");
}
}11.图片切割
/// <summary>
/// 图片切割
/// </summary>
/// <param name="template">原图路径</param>
/// <param name="savePath">切割图保存路径</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">切割宽度</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格式的图片旋转后作为水印贴图片上有黑色效果，有风险