C# 将多个图片合并成TIFF文件的两种方法

Posted 2021-05-08 dotNET跨平台

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：

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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