Zi 字媒體

C# 圖片(圖像/影像) 基礎(基本) 運算/處理 資料來源: https://blog.csdn.net/qq_42170268/article/details/82259029 https://dotblogs.com.tw/ricochen/2009/12/07/12324 code: using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Lib { //https://blog.csdn.net/qq_42170268/article/details/82259029 //https://dotblogs.com.tw/ricochen/2009/12/07/12324 public class ImageCalc { public static Image MarkImage(Image img1, Image img2)//圖片浮水印 { Image MergedImage = default(Image); //設定背景圖片 Graphics gr = System.Drawing.Graphics.FromImage(img1); //新建logo浮水印圖片 Bitmap Logo = new Bitmap(img2.Width, img2.Height); Graphics tgr = Graphics.FromImage(Logo); ColorMatrix cmatrix = new ColorMatrix(); //設定圖片色彩(透明度) cmatrix.Matrix33 = 0.5F; ImageAttributes imgattributes = new ImageAttributes(); imgattributes.SetColorMatrix(cmatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); tgr.DrawImage(img2, new Rectangle(0, 0, Logo.Width, Logo.Height), 0, 0, Logo.Width, Logo.Height, GraphicsUnit.Pixel, imgattributes); tgr.Dispose(); //logo圖片位置 gr.DrawImage(Logo, img1.Width / 3, 10); gr.Dispose(); MergedImage = img1; return MergedImage; } public static Image VerticalMergeImages(Image img1, Image img2)//垂直合併 { Image MergedImage = default(Image); Int32 Wide = 0; Int32 High = 0; High = img1.Height + img2.Height;//設定高度 if (img1.Width >= img2.Width) { Wide = img1.Width; } else { Wide = img2.Width; } Bitmap mybmp = new Bitmap(Wide, High); Graphics gr = Graphics.FromImage(mybmp); //處理第一張圖片 gr.DrawImage(img1, 0, 0); //處理第二張圖片 gr.DrawImage(img2, 0, img1.Height); MergedImage = mybmp; gr.Dispose(); return MergedImage; } public static Image HorizontalMergeImages(Image img1, Image img2)//水平合併 { Image MergedImage = default(Image); Int32 Wide = 0; Int32 High = 0; Wide = img1.Width + img2.Width;//設定寬度 if (img1.Height >= img2.Height) { High = img1.Height; } else { High = img2.Height; } Bitmap mybmp = new Bitmap(Wide, High); Graphics gr = Graphics.FromImage(mybmp); //處理第一張圖片 gr.DrawImage(img1, 0, 0); //處理第二張圖片 gr.DrawImage(img2, img1.Width, 0); MergedImage = mybmp; gr.Dispose(); return MergedImage; } /// /// 背景透明化 /// /// 原圖 /// 圖片寬度 /// 圖片高度 /// 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在色差範圍內，透明度為0 } else { alpha = 255; } bg.SetPixel(x, y, Color.FromArgb(alpha, r1, g1, b1)); } } return bg; } /// /// 指定顏色透明化 /// /// 原圖 /// 原圖寬度 /// 原圖高度 /// 指定顏色RGB的R值 /// 指定顏色RGB的G值 /// 指定顏色RGB的B值 /// 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; //若兩種顏色比較接近，透明度設為0 } else { alpha = 255; } bg.SetPixel(x, y, Color.FromArgb(alpha, r1, g1, b1)); } } return bg; } /// /// 指定顏色替換成另一種顏色 /// /// 原圖 /// 圖寬 /// 圖高 /// 要被替換顏色的RGB的R /// 要被替換顏色的RGB的G /// 要被替換顏色的RGB的B /// 替換色的RGB的R /// 替換色的RGB的G /// 替換色的RGB的B /// 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; } /// /// 圖片按比例縮放 /// /// 靶心圖表片 /// 縮放的比例 /// public static Image PictureHandle1(Image SourceImage, float a) { int W; //縮放後圖片的寬 int H; //縮放後圖片的高 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; } /// /// 圖片旋轉 /// /// 原圖 /// 旋轉後保存路徑 /// 旋轉角度 public static bool 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))); //目標點陣圖 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); //恢復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") { return false;//MessageBox.Show("圖片保存不是png格式，旋轉效果有誤！請重新選擇保存格式！"); } else { dsImage.Save(savePath, ImageFormat.Png); return true;//MessageBox.Show("圖片旋轉成功！"); } } /// /// 圖片更改透明度 /// /// 浮水印圖 /// 透明度值 0—255 /// 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(); } } } /// /// 圖片添加文字 /// /// 範本路徑 /// 保存路徑 /// 文字內容 /// 字體 /// 字體顏色 /// 文字添加位置的起始座標X /// 文字添加位置的起始座標Y 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); } } /// /// 圖片添加小圖 /// /// 範本圖路徑 /// 小圖路徑 /// 保存路徑 /// 小圖添加位置起始座標X /// 小圖添加位置起始座標Y 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); } } /// /// 橫向合併兩張圖片 /// /// 左圖檔的路徑 /// 右圖的檔路徑 /// 合成圖片保存路徑 public static bool 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); } return true;//MessageBox.Show("圖片合成成功!"); } else { return false;//MessageBox.Show("兩張圖片的高度不一致，請重新選擇！"); } } /// /// 縱向合併兩張圖片 /// /// 上圖檔的路徑 /// 下圖的檔路徑 /// 合成圖片保存路徑 public static bool 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); } return true;//MessageBox.Show("圖片合成成功!"); } else { return false;//MessageBox.Show("兩張圖片的寬度不一致，請重新選擇！"); } } /// /// 圖片切割 /// /// 原圖路徑 /// 切割圖保存路徑 /// 切割起始位置的座標X /// 切割起始位置的座標Y /// 切割寬度 /// 切割高度 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); } } } }