以下文章来源于WPF UI ，作者Gxy
最近需要用到TIF格式的文件，研究了一段时间，终于有点结果了，
发现两种方式，第一种是使用BitMiracle.LibTiff.NET，直接在Nuget上安装即可
，第二种是使用RasterEdge.DocImageSDK，要从官网下载dll包
第一种免费，但是生成的tiff文件大小比原始图片大的多
第二种收费，但是有试用期一个月，效果很好，生成的tiff文件比原图小的多而且不失真。过期之后，只需要到官网下载最新dll,重新引用即可再来一个月试用。。。
先说第二种RasterEdge.DocImageSDK的使用方法：
官网地址：http://www.rasteredge.com/how-to/csharp-imaging/tiff-convert-bmp/
//过期后打开上面 这个网址，重新下载 dll包，重新引用即可 bin x64 4.0
新建一个cmd项目，测试代码如下：
class Program{private static byte[] CompressionImage(Stream fileStream, long quality){using (System.Drawing.Image img = System.Drawing.Image.FromStream(fileStream)){using (Bitmap bitmap = new Bitmap(img)){ImageCodecInfo CodecInfo = GetEncoder(img.RawFormat);System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;EncoderParameters myEncoderParameters = new EncoderParameters(1);EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality);myEncoderParameters.Param[0] = myEncoderParameter;using (MemoryStream ms = new MemoryStream()){bitmap.Save(ms, CodecInfo, myEncoderParameters);myEncoderParameters.Dispose();myEncoderParameter.Dispose();return ms.ToArray();}}}}private static ImageCodecInfo GetEncoder(ImageFormat format){ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();foreach (ImageCodecInfo codec in codecs){if (codec.FormatID == format.Guid){ return codec; }}return null;}static void Main(string[] args){string[] imagePaths = System.IO.Directory.GetFiles(@"D:\images\","*.jpg");Bitmap[] bmps = new Bitmap[imagePaths.Count()];for (int i = 0; i < imagePaths.Length; i++){var stream = new FileStream(imagePaths[i], FileMode.Open);var by = CompressionImage(stream, 100);stream.Close();Bitmap tmpBmp = new Bitmap(new MemoryStream(by));if (tmpBmp != null)bmps[i] = tmpBmp;}ImageOutputOption option = new ImageOutputOption() { Color = ColorType.Color, Compression = ImageCompress.CCITT };TIFFDocument tifDoc = new TIFFDocument(bmps, option);if (tifDoc == null)throw new Exception("Fail to construct TIFF Document");tifDoc.Save(@"D:\images\test.tif");}}
下面说说第二种免费的方式：
新建一个TiffHelper帮助类：
using BitMiracle.LibTiff.Classic;using System;using System.Drawing;using System.Drawing.Imaging;using System.IO;namespace JpgToTiff{public class UserErrorHandler : TiffErrorHandler{public override void WarningHandler(Tiff tif, string method, string format, params object[] args){//base.WarningHandler(tif, method, format, args);}public override void WarningHandlerExt(Tiff tif, object clientData, string method, string format, params object[] args){//base.WarningHandlerExt(tif, clientData, method, format, args);}}public class TiffHelper{public static UserErrorHandler m_errorHandler = new UserErrorHandler();static TiffHelper(){Tiff.SetErrorHandler(m_errorHandler);}/// <summary>/// 合并jpg/// </summary>/// <param name="bmps">bitmap数组</param>/// <param name="tiffSavePath">保存路径</param>/// <param name="quality">图片质量，1-100</param>/// <returns></returns>public static bool Jpegs2Tiff(Bitmap[] bmps, string tiffSavePath, int quality = 15){try{MemoryStream ms = new MemoryStream();using (Tiff tif = Tiff.ClientOpen(@"in-memory", "w", ms, new TiffStream())){foreach (var bmp in bmps)//{byte[] raster = GetImageRasterBytes(bmp, PixelFormat.Format24bppRgb);tif.SetField(TiffTag.IMAGEWIDTH, bmp.Width);tif.SetField(TiffTag.IMAGELENGTH, bmp.Height);tif.SetField(TiffTag.COMPRESSION, Compression.JPEG);tif.SetField(TiffTag.PHOTOMETRIC, Photometric.RGB);tif.SetField(TiffTag.JPEGQUALITY, quality);tif.SetField(TiffTag.ROWSPERSTRIP, bmp.Height);tif.SetField(TiffTag.XRESOLUTION, 90);tif.SetField(TiffTag.YRESOLUTION, 90);tif.SetField(TiffTag.BITSPERSAMPLE, 8);tif.SetField(TiffTag.SAMPLESPERPIXEL, 3);tif.SetField(TiffTag.PLANARCONFIG, PlanarConfig.CONTIG);int stride = raster.Length / bmp.Height;ConvertSamples(raster, bmp.Width, bmp.Height);for (int i = 0, offset = 0; i < bmp.Height; i++){tif.WriteScanline(raster, offset, i, 0);offset += stride;}tif.WriteDirectory();}System.IO.FileStream fs = new FileStream(tiffSavePath, FileMode.Create);ms.Seek(0, SeekOrigin.Begin);fs.Write(ms.ToArray(), 0, (int)ms.Length);fs.Close();return true;}}catch (Exception ex){return false;}}private static byte[] GetImageRasterBytes(Bitmap bmp, PixelFormat format){Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);byte[] bits = null;try{BitmapData bmpdata = bmp.LockBits(rect, ImageLockMode.ReadWrite, format);bits = new byte[bmpdata.Stride * bmpdata.Height];System.Runtime.InteropServices.Marshal.Copy(bmpdata.Scan0, bits, 0, bits.Length);bmp.UnlockBits(bmpdata);}catch{return null;}return bits;}private static void ConvertSamples(byte[] data, int width, int height){int stride = data.Length / height;const int samplesPerPixel = 3;for (int y = 0; y < height; y++){int offset = stride * y;int strideEnd = offset + width * samplesPerPixel;for (int i = offset; i < strideEnd; i += samplesPerPixel){byte temp = data[i + 2];data[i + 2] = data[i];data[i] = temp;}}}}}
下面是测试代码：
class Program{private static byte[] CompressionImage(Stream fileStream, long quality){using (System.Drawing.Image img = System.Drawing.Image.FromStream(fileStream)){using (Bitmap bitmap = new Bitmap(img)){ImageCodecInfo CodecInfo = GetEncoder(img.RawFormat);System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;EncoderParameters myEncoderParameters = new EncoderParameters(1);EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality);myEncoderParameters.Param[0] = myEncoderParameter;using (MemoryStream ms = new MemoryStream()){bitmap.Save(ms, CodecInfo, myEncoderParameters);myEncoderParameters.Dispose();myEncoderParameter.Dispose();return ms.ToArray();}}}}private static ImageCodecInfo GetEncoder(ImageFormat format){ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();foreach (ImageCodecInfo codec in codecs){if (codec.FormatID == format.Guid){ return codec; }}return null;}static void Main(string[] args){string[] imagePaths = System.IO.Directory.GetFiles(@"D:\images\","*.jpg");Bitmap[] bmps = new Bitmap[imagePaths.Count()];for (int i = 0; i < imagePaths.Length; i++){var stream = new FileStream(imagePaths[i], FileMode.Open);var by = CompressionImage(stream, 100);stream.Close();Bitmap tmpBmp = new Bitmap(new MemoryStream(by));if (tmpBmp != null)bmps[i] = tmpBmp;}TiffHelper.Jpegs2Tiff(bmps, @"D:\images\test.tif", 100);}}
可以看到，两个方式生成的tif文件大小简直天壤之别。。。
7个原图大小4.8M,第一种1.36M,
第二种直接23.5M…
也可能是我没有弄好压缩方式。。。。
那我就不晓得了。
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