最近需要用到TIF格式的檔案，研究了一段時間，終于有點結果了，
發現兩種方式，第一種是使用BitMiracle.LibTiff.NET，直接在Nuget上安裝即可
，第二種是使用RasterEdge.DocImageSDK，要從官網下載下傳dll包
第一種免費，但是生成的tiff檔案大小比原始圖檔大的多
第二種收費，但是有試用期一個月，效果很好，生成的tiff檔案比原圖小的多而且不失真。過期之後，隻需要到官網下載下傳最新dll,重新引用即可再來一個月試用。。。
先說第二種RasterEdge.DocImageSDK的使用方法：
官網位址：http://www.rasteredge.com/how-to/csharp-imaging/tiff-convert-bmp/
//過期後打開上面 這個網址，重新下載下傳 dll包，重新引用即可 bin x64 4.0
建立一個cmd項目，測試代碼如下：
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");
}
}
下面說說第二種免費的方式：
建立一個TiffHelper幫助類：
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數組</param>
/// <param name="tiffSavePath">儲存路徑</param>
/// <param name="quality">圖檔品質，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;
}
}
}
}
}
下面是測試代碼：
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，兩個方式生成的tif檔案大小簡直天壤之别。。。
7個原圖大小4.8M,第一種1.36M,
第二種直接23.5M…
也可能是我沒有弄好壓縮方式。。。。
那我就不曉得了。