C#图片切割、图片压缩、缩略图生成代码汇总
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2023-11-14 20:51:28
本文为大家整理了c#图片切割、图片压缩、缩略图生成的实现代码,大家可以收藏,方便以后使用,具体内容如下
/// 图片切割函数
///
本文为大家整理了c#图片切割、图片压缩、缩略图生成的实现代码,大家可以收藏,方便以后使用,具体内容如下
/// 图片切割函数 /// </summary> /// <param name="sourcefile">原始图片文件</param> /// <param name="xnum">在x轴上的切割数量</param> /// <param name="ynum">在y轴上的切割数量</param> /// <param name="quality">质量压缩比</param> /// <param name="outputfile">输出文件名,不带后缀</param> /// <returns>成功返回true,失败则返回false</returns> public static bool imagecut(string sourcefile, int xnum, int ynum, long quality, string outputfile) { try { long imagequality = quality; bitmap sourceimage = new bitmap(sourcefile); imagecodecinfo myimagecodecinfo = getencoderinfo("image/jpeg"); encoder myencoder = encoder.quality; encoderparameters myencoderparameters = new encoderparameters(1); encoderparameter myencoderparameter = new encoderparameter(myencoder, imagequality); myencoderparameters.param[0] = myencoderparameter; float xwidth = sourceimage.width / xnum; float ywidth = sourceimage.height / ynum; string outputimage = ""; for (int county = 0; county < ynum; county++) for (int countx = 0; countx < xnum; countx++) { rectanglef clonerect = new rectanglef(countx * xwidth, county * ywidth, xwidth, ywidth); bitmap newimage = sourceimage.clone(clonerect, pixelformat.format24bpprgb); outputimage = outputfile + countx + county + ".jpg"; newimage.save(outputimage, myimagecodecinfo, myencoderparameters); } return true; } catch { return false; } } #endregion imagecut imagecompress #region imagecompress /**//// <summary> /// 图片压缩函数 /// </summary> /// <param name="sourcefile">原始图片文件</param> /// <param name="quality">质量压缩比</param> /// <param name="ouputfile">输出文件名,请用 .jpg 后缀 </param> /// <returns>成功返回true,失败则返回false</returns> public static bool imagecompress(string sourcefile,long quality,string outputfile) { try { long imagequality = quality; bitmap sourceimage = new bitmap(sourcefile); imagecodecinfo myimagecodecinfo = getencoderinfo("image/jpeg"); encoder myencoder = encoder.quality; encoderparameters myencoderparameters = new encoderparameters(1); encoderparameter myencoderparameter = new encoderparameter(myencoder, imagequality); myencoderparameters.param[0] = myencoderparameter; sourceimage.save(outputfile, myimagecodecinfo, myencoderparameters); return true; } catch { return false; } } #endregion imagecompress getthumimage#region getthumimage /**//// <summary> /// 生成缩略图 /// </summary> /// <param name="sourcefile">原始图片文件</param> /// <param name="quality">质量压缩比</param> /// <param name="multiple">收缩倍数</param> /// <param name="outputfile">输出文件名</param> /// <returns>成功返回true,失败则返回false</returns> public static bool getthumimage(string sourcefile, long quality, int multiple, string outputfile) { try { long imagequality = quality; bitmap sourceimage = new bitmap(sourcefile); imagecodecinfo myimagecodecinfo = getencoderinfo("image/jpeg"); encoder myencoder = encoder.quality; encoderparameters myencoderparameters = new encoderparameters(1); encoderparameter myencoderparameter = new encoderparameter(myencoder, imagequality); myencoderparameters.param[0] = myencoderparameter; float xwidth = sourceimage.width; float ywidth = sourceimage.height; bitmap newimage = new bitmap((int)(xwidth /multiple), (int)(ywidth /multiple)); graphics g = graphics.fromimage(newimage); g.drawimage(sourceimage, 0, 0, xwidth / multiple, ywidth / multiple); g.dispose(); newimage.save(outputfile,myimagecodecinfo,myencoderparameters); return true; } catch { return false; } } #endregion getthumimage imagecodecinfo#region imagecodecinfo /**//// <summary> /// 获取图片编码信息 /// </summary> private static imagecodecinfo getencoderinfo(string mimetype) { int j; imagecodecinfo[] encoders; encoders = imagecodecinfo.getimageencoders(); for (j = 0; j < encoders.length; ++j) { if (encoders[j].mimetype == mimetype) return encoders[j]; } return null; }
以上就是本文的全部内容,希望对大家的学习有所帮助。