本文实例讲述了C#给图片添加水印的方法。分享给大家供大家参考，具体如下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 | using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Drawing;using System.IO;using System.Drawing.Imaging;/// <summary>///ImgWater 的摘要说明/// </summary>public class ImgWater{ public ImgWater() { // //TODO: 在此处添加构造函数逻辑 // } /// <summary> /// 图片水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="WaterImg">水印图片地址</param> /// <param name="sImgPath">水印图片保存地址</param> /// <param name="Alpha">水印透明度设置</param> /// <param name="iScale">水印图片在原图上的显示比例</param> /// <param name="intDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param> public bool zzsImgWater( string ImgFile , string WaterImg , string sImgPath , float Alpha , float iScale , int intDistance ) { try { //装载图片 FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; System.Drawing.Image imgWatermark = new Bitmap(WaterImg); int imgWatermarkWidth = imgWatermark.Width; int imgWatermarkHeight = imgWatermark.Height; //计算水印图片尺寸 decimal aScale = Convert.ToDecimal(iScale); decimal pScale = 0.05M; decimal MinScale = aScale - pScale; decimal MaxScale = aScale + pScale; int imgWatermarkWidthNew = imgWatermarkWidth; int imgWatermarkHeightNew = imgWatermarkHeight; if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth >= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32((imgPhotoHeight * aScale / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth >= imgWatermarkHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth <= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth <= imgWatermarkHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } //将原图画出来 Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.Clear(Color.White); gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , 0 , 0 , imgPhotoWidth , imgPhotoHeight , GraphicsUnit.Pixel ); Bitmap bmWatermark = new Bitmap(bmPhoto); bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); Graphics gWatermark = Graphics.FromImage(bmWatermark); //指定高质量显示水印图片质量 gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; ImageAttributes imageAttributes = new ImageAttributes(); //设置两种颜色,达到合成效果 ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap); //用矩阵设置水印图片透明度 float[][] colorMatrixElements = { new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, Alpha, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap); //确定水印边距 int xPos = imgPhotoWidth - imgWatermarkWidthNew; int yPos = imgPhotoHeight - imgWatermarkHeightNew; int xPosOfWm = 0; int yPosOfWm = 0; if (xPos > intDistance) xPosOfWm = xPos - intDistance; else xPosOfWm = xPos; if (yPos > intDistance) yPosOfWm = yPos - intDistance; else yPosOfWm = yPos; gWatermark.DrawImage( imgWatermark , new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew) , 0 , 0 , imgWatermarkWidth , imgWatermarkHeight , GraphicsUnit.Pixel , imageAttributes ); imgPhoto = bmWatermark; //以jpg格式保存图片 imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); //销毁对象 gbmPhoto.Dispose(); gWatermark.Dispose(); imgPhoto.Dispose(); imgWatermark.Dispose(); return true; } catch { return false ; } } /**//// <summary> /// 文字水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="TextFont">水印文字</param> /// <param name="sImgPath">文字水印图片保存地址</param> /// <param name="hScale">高度位置</param> /// <param name="widthFont">文字块在图片中所占宽度比例</param> /// <param name="Alpha">文字透明度 其数值的范围在0到255</param> public bool zzsTextWater( string ImgFile , string TextFont , string sImgPath , float hScale , float widthFont , int Alpha ) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , 0 , 0 , imgPhotoWidth , imgPhotoHeight , GraphicsUnit.Pixel ); //建立字体大小的数组,循环找出适合图片的水印字体 //int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 }; int[] sizes = new int[] { 28, 26, 24, 20, 16, 14, 12 }; System.Drawing.Font crFont = null; System.Drawing.SizeF crSize = new SizeF(); for (int i = 0; i < 7; i++) { crFont = new Font("微软雅黑", sizes[i], FontStyle.Bold); crSize = gbmPhoto.MeasureString(TextFont, crFont); if ((ushort)crSize.Width < (ushort)imgPhotoWidth * widthFont) break; } //设置水印字体的位置 //int yPixlesFromBottom = (int)(imgPhotoHeight * hScale); //float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2)); //float xCenterOfImg = (imgPhotoWidth * 1 / 2); float yPosFromBottom = imgPhotoHeight *0.85f; float xCenterOfImg = imgPhotoWidth * 0.8f; //if (xCenterOfImg<crSize.Height) // xCenterOfImg = (imgPhotoWidth * (1 - (crSize.Height)/ imgPhotoWidth)); System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat(); StrFormat.Alignment = System.Drawing.StringAlignment.Center; // System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 0, 0, 0)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush2 , new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1) , StrFormat ); System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 255, 255, 255)); //gbmPhoto.FillRectangle(semiTransBrush2, new RectangleF(new PointF(xCenterOfImg - crSize.Width / 2, yPosFromBottom - 4), crSize)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush , new System.Drawing.PointF(xCenterOfImg, yPosFromBottom) , StrFormat ); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); gbmPhoto.Dispose(); imgPhoto.Dispose(); bmPhoto.Dispose(); return true; } catch { return false; } } /**//// <summary> /// 文字和Logo图片水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="WaterImg">水印图片地址</param> /// <param name="TextFont">水印文字信息</param> /// <param name="sImgPath">生存水印图片后的保存地址</param> /// <param name="ImgAlpha">水印图片的透明度</param> /// <param name="imgiScale">水印图片在原图上的显示比例</param> /// <param name="intimgDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param> /// <param name="texthScale">水印文字高度位置,从图片底部开始计算，0－1</param> /// <param name="textwidthFont">文字块在图片中所占宽度比例 0－1</param> /// <param name="textAlpha">文字透明度 其数值的范围在0到255</param> public void zzsImgTextWater( string ImgFile , string WaterImg , string TextFont , string sImgPath , float ImgAlpha , float imgiScale , int intimgDistance , float texthScale , float textwidthFont , int textAlpha ) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , 0 , 0 , imgPhotoWidth , imgPhotoHeight , GraphicsUnit.Pixel ); //建立字体大小的数组,循环找出适合图片的水印字体 int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 }; System.Drawing.Font crFont = null; System.Drawing.SizeF crSize = new SizeF(); for (int i = 0; i < 43; i++) { crFont = new Font("arial", sizes[i], FontStyle.Bold); crSize = gbmPhoto.MeasureString(TextFont, crFont); if ((ushort)crSize.Width < (ushort)imgPhotoWidth * textwidthFont) break; } //设置水印字体的位置 int yPixlesFromBottom = (int)(imgPhotoHeight * texthScale); float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2)); float xCenterOfImg = (imgPhotoWidth * 1 / 2); System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat(); StrFormat.Alignment = System.Drawing.StringAlignment.Center; // System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 0, 0, 0)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush2 , new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1) , StrFormat ); System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 255, 255, 255)); gbmPhoto.DrawString( TextFont , crFont , semiTransBrush , new System.Drawing.PointF(xCenterOfImg, yPosFromBottom) , StrFormat ); System.Drawing.Image imgWatermark = new Bitmap(WaterImg); int imgWatermarkWidth = imgWatermark.Width; int imgWatermarkHeight = imgWatermark.Height; //计算水印图片尺寸 decimal aScale = Convert.ToDecimal(imgiScale); decimal pScale = 0.05M; decimal MinScale = aScale - pScale; decimal MaxScale = aScale + pScale; int imgWatermarkWidthNew = imgWatermarkWidth; int imgWatermarkHeightNew = imgWatermarkHeight; if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth >= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32((imgPhotoHeight * aScale / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth >= imgWatermarkHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth <= imgPhotoHeight) if (imgWatermarkWidth > imgWatermarkHeight) if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale)) { } else { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } else if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) && (Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale)) { } else { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth <= imgWatermarkHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight); } if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight) { imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale); imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth); } //将原图画出来 Bitmap bmWatermark = new Bitmap(bmPhoto); bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); Graphics gWatermark = Graphics.FromImage(bmWatermark); //指定高质量显示水印图片质量 gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes(); //设置两种颜色,达到合成效果 System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); System.Drawing.Imaging.ColorMap[] remapTable = { colorMap }; imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap); //用矩阵设置水印图片透明度 float[][] colorMatrixElements = { new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, ImgAlpha, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap); //确定水印边距 int xPos = imgPhotoWidth - imgWatermarkWidthNew; int yPos = imgPhotoHeight - imgWatermarkHeightNew; int xPosOfWm = 0; int yPosOfWm = 0; if (xPos > intimgDistance) xPosOfWm = xPos - intimgDistance; else xPosOfWm = xPos; if (yPos > intimgDistance) yPosOfWm = yPos - intimgDistance; else yPosOfWm = yPos; gWatermark.DrawImage( imgWatermark , new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew) , 0 , 0 , imgWatermarkWidth , imgWatermarkHeight , GraphicsUnit.Pixel , imageAttributes ); imgPhoto = bmWatermark; //以jpg格式保存图片 imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); //销毁对象 gbmPhoto.Dispose(); gWatermark.Dispose(); bmPhoto.Dispose(); imgPhoto.Dispose(); imgWatermark.Dispose(); } catch { } } /**//// <summary> /// 缩略图 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="sImgPath">缩略图保存地址</param> /// <param name="ResizeWidth">缩略图宽度</param> /// <param name="ResizeHeight">缩略图高度</param> /// <param name="BgColor">缩略图背景颜色,注意,背景颜色只能指定KnownColor中的值,如blue,red,green等</param> public bool zzsResizeImg( string ImgFile , string sImgPath , int ResizeWidth , int ResizeHeight , string BgColor ) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; int startX = 0; int StartY = 0; int NewWidth = 0; int NewHeight = 0; if (imgPhotoWidth >= ResizeWidth && imgPhotoHeight >= ResizeHeight) { NewWidth = ResizeWidth; NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10)); startX = 0; StartY = (ResizeHeight - NewHeight) / 2; } if (ResizeWidth > imgPhotoWidth && ResizeHeight < imgPhotoHeight) { NewHeight = ResizeHeight; NewWidth = Convert.ToInt32(imgPhotoWidth * Math.Round(Convert.ToDecimal(ResizeHeight) / Convert.ToDecimal(imgPhotoHeight), 10)); startX = (ResizeWidth - NewWidth) / 2; StartY = 0; } if (ResizeWidth < imgPhotoWidth && ResizeHeight > imgPhotoHeight) { NewWidth = ResizeWidth; NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10)); startX = 0; StartY = (ResizeHeight - NewHeight) / 2; } if (imgPhotoWidth < ResizeWidth && imgPhotoHeight < ResizeHeight) { NewWidth = imgPhotoWidth; NewHeight = imgPhotoHeight; startX = (ResizeWidth - imgPhotoWidth) / 2; StartY = (ResizeHeight - imgPhotoHeight) / 2; } //计算缩放图片尺寸 Bitmap bmPhoto = new Bitmap(ResizeWidth, ResizeHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.Clear(Color.FromName(BgColor)); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(startX, StartY, NewWidth, NewHeight) , new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight) , GraphicsUnit.Pixel ); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); imgPhoto.Dispose(); gbmPhoto.Dispose(); bmPhoto.Dispose(); ms.Close(); return true; } catch { return false; } } /**//// <summary> /// 图片剪切 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="sImgPath">缩略图保存地址</param> /// <param name="PointX">剪切起始点 X坐标</param> /// <param name="PointY">剪切起始点 Y坐标</param> /// <param name="CutWidth">剪切宽度</param> /// <param name="CutHeight">剪切高度</param> public bool zzsCutImg(string ImgFile, string sImgPath, int PointX, int PointY, int CutWidth, int CutHeight) { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); try { byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); //此处只能用filestream，用 System.Drawing.Image则会报多过进程访问文件的错误，会锁定文件 Bitmap bmPhoto = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage( imgPhoto , new Rectangle(0, 0, CutWidth, CutHeight) , new Rectangle(PointX, PointY, CutHeight, CutHeight) , GraphicsUnit.Pixel ); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); imgPhoto.Dispose(); gbmPhoto.Dispose(); bmPhoto.Dispose(); ms.Close(); return true; } catch { return false; } finally { } }} |
希望本文所述对大家C#程序设计有所帮助。
