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01 — 前言 為啥名稱后面加個續(xù)集呢，因為之前有位仁兄寫過一篇，我是在他的基礎(chǔ)上繼續(xù)開發(fā)和探索的，他那篇文章的鏈接： 然后這位仁兄在文末提了一個遺留問題： -----. 這個問題實際上就是因為兩種壓縮方式和壓縮比率不一樣導(dǎo)致的. 02 — 名詞解釋 首先要弄清楚幾個名詞： ① 圖像的壓縮品質(zhì)：指的就是壓縮后的圖象清晰度，通俗地講，就是用圖像處理軟件保存圖像時，為了節(jié)省硬盤空間，一般是要對原始圖像通過一定的算法進(jìn)行壓縮的，而壓縮品質(zhì)實質(zhì)上就是壓縮比率的大小，壓縮的比率越高，生成的圖像所占硬盤空間就越少，便是圖片質(zhì)量也就越差；相反，壓縮比率越低，圖像的品質(zhì)越高，但是相應(yīng)地占用硬盤空間也就越大。 ② Tiff：標(biāo)簽圖像文件格式（Tag Image File Format，TIFF）是一種靈活的位圖格式，TIFF（Tag Image File Format）圖像文件是圖形圖像處理中常用的格式之一，其圖像格式很復(fù)雜，但由于它對圖像信息的存放靈活多變，可以支持很多色彩系統(tǒng)，而且獨立于操作系統(tǒng)，因此得到了廣泛應(yīng)用。TIFF文件以.tif為擴(kuò)展名。 03 — 新的探索 變化一：這位仁兄的處理方式是把每張圖片先用CompressionImage這個方法加載到內(nèi)存進(jìn)行編碼壓縮的，實際上這一步是沒有必要的，不僅僅浪費了時間還沒有節(jié)省空間，因為調(diào)用的第三方本身就帶了圖片壓縮的功能，所以這一段我的項目去掉了； 變化二：這位仁兄處理是把一組圖片一次壓縮成一張tiff，我這邊的應(yīng)用場景是圖片一張一張來，所以就是每來一張就壓縮一張； 變化三：除了圖片合成，我的項目中添加了tiff文件拆分的方法； 變化四：記錄圖片加載、合成、保存的時間并寫入log文件. 04 — 源碼分享 我這里測試采用的是控制臺，運行后輸入你也數(shù)值：要合并的圖片的數(shù)量，就可以執(zhí)行了，測試過程我只有一張圖片，所以我將這張圖片進(jìn)行了克?。?/span> Program.cs：這里有三個方法，依次是Main、BmpToTiff和CopyImage，CopyImage負(fù)責(zé)圖片克隆，BmpToTiff方法的for循環(huán)中可以選擇圖片合成的方案一或者二。 using System;using System.Collections.Generic;using System.Diagnostics;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using TiffHelper;namespace TiffConsole{ class Program { private static Stopwatch stopwatch = new Stopwatch(); static void Main(string[] args) { string filePath = @"C:\Users\majm\Desktop\新建文件夾\"; CopyImage(filePath); BmpToTiff(filePath); //SplitTiffToBMP.SplitTiff(filePath);//圖片分割 Console.ReadKey(); } public static void BmpToTiff(string filePath) { List<TiffHelper.TimeSpan> timeSpans = new List<TiffHelper.TimeSpan>(); string[] imagePaths = System.IO.Directory.GetFiles(filePath, "*.bmp"); stopwatch.Start(); for (int i = 0; i < imagePaths.Length; i++) { //調(diào)用方案1 //var timeSpan = BitMiracle.Jpeg2Tiff(i, imagePaths.Length, filePath, $"{i}.tif", 100); //調(diào)用方案2 var timeSpan = RasterEdge.TIFFDocument(i,filePath); timeSpans.Add(timeSpan); } stopwatch.Stop(); FileWrite.WriteLogFile("Id,LoadTime,MergeTime,SaveTime,TotalTime,flag", true); timeSpans.ForEach(n => FileWrite.WriteLogFile(n.ToString(), true)); FileWrite.WriteLogFile("合成圖片總計耗時：" + stopwatch.ElapsedMilliseconds.ToString() + "毫秒", true); Console.WriteLine("合成圖片總計耗時：" + stopwatch.ElapsedMilliseconds.ToString() + "毫秒"); } public static void CopyImage(string filePath) { Console.WriteLine("請輸入合并圖片的數(shù)量："); //控制臺輸入圖片數(shù)量 bool flag = false; int count = 0; while (!flag) { flag = int.TryParse(Console.ReadLine(), out count); } //復(fù)制圖片 Bitmap bitmap = new Bitmap(filePath + "0.bmp"); for (int i = 1; i < count; i++) { bitmap.Save(filePath + $"{i}.bmp"); } bitmap.Dispose(); } }}合圖和拆分的代碼我寫到了類庫TiffHelper中： BitMiracle.cs using BitMiracle.LibTiff.Classic;using System;using System.Diagnostics;using System.Drawing;using System.Drawing.Imaging;using System.IO;namespace TiffHelper{ public class BitMiracle { /// 合并jpg /// </summary> /// <param name="bmps">bitmap數(shù)組</param> /// <param name="tiffSavePath">保存路徑</param> /// <param name="quality">圖片質(zhì)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 MemoryStream ms1 = new MemoryStream(); private static Tiff tif = Tiff.ClientOpen(@"in-memory", "w", ms1, new TiffStream()); /// <summary> /// tiff圖片合成，一次合并一張 /// </summary> /// <param name="index">圖片id</param> /// <param name="totalCount">圖片數(shù)量</param> /// <param name="tiffSavePath">tiff保存路徑</param> /// <param name="quality">壓縮品質(zhì)</param> /// <returns></returns> public static TimeSpan Jpeg2Tiff(int index, int totalCount, string tiffSavePath,string fileName, int quality = 75) { try { string fileFullPath = Path.Combine(tiffSavePath, fileName); Stopwatch sTotal = new Stopwatch(); sTotal.Start(); TimeSpan timeSpan = new TimeSpan(); timeSpan.Id = index; //Bitmap[] bmps = new Bitmap[1] {new Bitmap( @"C:\Users\zhuyr\Desktop\AutoFocus\" + $"{i}.bmp")}; Stopwatch sw = new Stopwatch(); sw.Start(); Bitmap bmp = new Bitmap(tiffSavePath + $"{index}.bmp"); sw.Stop(); timeSpan.LoadTime = sw.ElapsedMilliseconds.ToString(); sw = new Stopwatch(); sw.Start(); byte[] raster = GetImageRasterBytes(bmp, PixelFormat.Format24bppRgb); tif.SetField(TiffTag.IMAGEWIDTH, bmp.Width); tif.SetField(TiffTag.IMAGELENGTH, bmp.Height); tif.SetField(TiffTag.COMPRESSION, Compression.NONE); 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(); sw.Stop(); timeSpan.MergeTime = sw.ElapsedMilliseconds.ToString(); sw = new Stopwatch(); sw.Start(); if (totalCount == 1000) { if (index % 10 == 9) { System.IO.FileStream fs = new FileStream(fileFullPath, FileMode.Create); ms1.Seek(0, SeekOrigin.Begin); fs.Write(ms1.ToArray(), 0, (int)ms1.Length); fs.Close(); sw.Stop(); } } else { System.IO.FileStream fs = new FileStream(fileFullPath, FileMode.Create); ms1.Seek(0, SeekOrigin.Begin); fs.Write(ms1.ToArray(), 0, (int)ms1.Length); fs.Close(); sw.Stop(); } timeSpan.SaveTime = sw.ElapsedMilliseconds.ToString(); sTotal.Stop(); timeSpan.TotalTime = sTotal.ElapsedMilliseconds.ToString(); timeSpan.flag = true; return timeSpan; } catch (Exception ex) { return null; } } 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; } } } }}Jpeg2Tiff這個方法的參數(shù)quality可以調(diào)節(jié)壓縮比率，這個值默認(rèn)是75，范圍是【0,100】，當(dāng)然你也可以通過tif.SetField(TiffTag.COMPRESSION, Compression.NONE);設(shè)置壓縮方式，會有以下這些可選項，每種方式都采用了不同算法，所以壓縮效率都是不一樣的. RasterEdge.cs 方案2，每次把新來的圖片插入上一次合成的tiff中 using RasterEdge.Imaging.Basic;using RasterEdge.XDoc.TIFF;using System;using System.Collections.Generic;using System.Diagnostics;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;namespace TiffHelper{ public class RasterEdge { public static TimeSpan TIFFDocument(int index,string filePath) { Stopwatch sTotal = new Stopwatch(); sTotal.Start(); TimeSpan timeSpan = new TimeSpan(); timeSpan.Id = index; Stopwatch sw = new Stopwatch(); sw.Start(); Bitmap[] bmps = new Bitmap[1] { new Bitmap(filePath + $"{index}.bmp") }; sw.Stop(); timeSpan.LoadTime = sw.ElapsedMilliseconds.ToString(); sw = new Stopwatch(); sw.Start(); //ImageOutputOption option = new ImageOutputOption() { Color = ColorType.Color, Compression = ImageCompress.CCITT }; ImageOutputOption option = new ImageOutputOption() { Type = ImageType.JPEG, Color = ColorType.Color, Compression = ImageCompress.Uncompressed }; TIFFDocument tifDoc_new = new TIFFDocument(bmps, option); TIFFDocument tifDoc_old; if (index > 0) { tifDoc_old = new TIFFDocument(filePath + $"{index - 1}.tif"); BasePage page = tifDoc_new.GetPage(0); tifDoc_old.InsertPage(page, index); } else { tifDoc_old = tifDoc_new; } if (tifDoc_old == null) throw new Exception("Fail to construct TIFF Document"); sw.Stop(); timeSpan.MergeTime = sw.ElapsedMilliseconds.ToString(); sw = new Stopwatch(); sw.Start(); tifDoc_old.Save(filePath + $"{index}.tif"); sw.Stop(); timeSpan.SaveTime = sw.ElapsedMilliseconds.ToString(); sTotal.Stop(); timeSpan.TotalTime = sTotal.ElapsedMilliseconds.ToString(); timeSpan.flag = true; return timeSpan; } }}SplitTiffToBMP.cs：圖片拆分 using System;using System.Collections.Generic;using System.Diagnostics;using System.Drawing.Imaging;using System.Linq;using System.Text;using System.Threading.Tasks;namespace TiffHelper{ public class SplitTiffToBMP { private static Stopwatch stopwatch = new Stopwatch(); public static void SplitTiff(string filePath) { stopwatch.Start(); List<TimeSpan> timeSpans = new List<TimeSpan>(); //分割Tif圖片為多個Gif圖片 System.Drawing.Image img = System.Drawing.Image.FromFile(filePath+"9.tif"); Guid guid = (Guid)img.FrameDimensionsList.GetValue(0); FrameDimension dimension = new FrameDimension(guid); int totalPage = img.GetFrameCount(dimension); for (int i = 0; i < totalPage; i++) { TimeSpan timeSpan = new TimeSpan(); Stopwatch sw = new Stopwatch(); sw.Start(); img.SelectActiveFrame(dimension, i); img.Save(filePath + i + ".bmp", System.Drawing.Imaging.ImageFormat.Bmp); sw.Stop(); timeSpan.Id = i; timeSpan.TotalTime = sw.ElapsedMilliseconds.ToString(); timeSpans.Add(timeSpan); } stopwatch.Stop(); FileWrite.WriteLogFile("Id,,,,TotalTime", true); timeSpans.ForEach(n => FileWrite.WriteLogFile(n.ToString(), true)); FileWrite.WriteLogFile("拆分圖片總計耗時：" + stopwatch.ElapsedMilliseconds.ToString() + "毫秒", true); Console.WriteLine("拆分圖片總計耗時：" + stopwatch.ElapsedMilliseconds.ToString() + "毫秒"); } }}數(shù)據(jù)模型： FileWrite.cs 記錄耗時，寫入 using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace TiffHelper{ public class FileWrite { /// <summary> /// log文件打印 /// </summary> /// <param name="logFullPath">文件全路徑</param> /// <param name="content">寫入內(nèi)容</param> /// <param name="flag">true：追加，false：覆蓋</param> public static void WriteLogFile(string content, bool flag,string logFullPath = @"C:\Users\majm\Desktop\新建文件夾\log.txt") { StreamWriter sw = new StreamWriter(logFullPath ,flag); sw.WriteLine(content); sw.Close(); } }}TimeSpan.cs using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace TiffHelper{ public class TimeSpan { public int Id; public string LoadTime; public string MergeTime; public string SaveTime; public string TotalTime; public bool flag; public override string ToString() { StringBuilder report = new StringBuilder(); report.Append($"{Id},{LoadTime},{MergeTime},{SaveTime},{TotalTime},{flag}"); return report.ToString(); } }}05 — 運行演示 06 — 項目源碼 鏈接：https://pan.baidu.com/s/1xw6iJkPg_5-P63QpLlX0kA |
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