WPF Bitmap / BitmapFrame to multi-page / multi-frame TIFF with JPEG encoding












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$begingroup$


I was searching for a long time how to write multi-page TIFFs with the JPEG encoding. TIFFs support JPEG encoded frames but the built-in encoder in .NET Framework does not have JPEG as a compression option.



The code is based on the answer to this question: https://stackoverflow.com/questions/14811496/tiff-with-jpeg-compression-much-larger-than-original-jpeg
but does not rely on the FreeImage library.



First up, a class to convert BitmapFrame or Bitmap to a JPEG image:



using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Media.Imaging;

namespace TIFF
{
public class Jpeg
{
public byte Data;
public uint Width;
public uint Height;
public uint HorizontalResolution;
public uint VerticalResolution;

public Jpeg(byte data, uint width, uint height, uint horizontalResolution, uint verticalResolution)
{
this.Data = data;
this.Width = width;
this.Height = height;
this.HorizontalResolution = horizontalResolution;
this.VerticalResolution = verticalResolution;
}

public static Jpeg FromBitmapFrame(BitmapFrame bitmap, long quality)
{
Jpeg jpeg;

using (var stream = new MemoryStream())
{
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.QualityLevel = 90;
encoder.Frames.Add(bitmap);
encoder.Save(stream);

jpeg = new Jpeg(stream.ToArray(), (uint)bitmap.Width, (uint)bitmap.Height, (uint)bitmap.DpiX, (uint)bitmap.DpiY);
}

return jpeg;
}

public static Jpeg FromBitmap(Bitmap bitmap, long quality)
{
Jpeg jpeg;
using (var stream = new MemoryStream())
{
ImageCodecInfo jpgEncoder = GetEncoder(ImageFormat.Jpeg);
Encoder encoder = Encoder.Quality;
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(encoder, quality);
bitmap.Save(stream, jpgEncoder, parameters);

jpeg = new Jpeg(stream.ToArray(), (uint) bitmap.Width, (uint) bitmap.Height, (uint) bitmap.HorizontalResolution, (uint) bitmap.VerticalResolution);
}

return jpeg;
}

private static ImageCodecInfo GetEncoder(ImageFormat format)
{
ImageCodecInfo codecs = ImageCodecInfo.GetImageDecoders();
foreach (ImageCodecInfo codec in codecs)
{
if (codec.FormatID == format.Guid)
{
return codec;
}
}
return null;
}
}
}


Next, a class to create the TIFF image



using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Windows.Media.Imaging;

namespace TIFF
{
public static class JpegTiff
{
public static byte Create(List<BitmapFrame> frames, long quality)
{
List<Jpeg> jpegs = new List<Jpeg>();

foreach (var frame in frames)
{
jpegs.Add(Jpeg.FromBitmapFrame(frame, quality));
}

return WrapJpegs(jpegs);
}

public static byte Create(List<Bitmap> bitmaps, string filename, long quality)
{
List<Jpeg> jpegs = new List<Jpeg>();

foreach (var bitmap in bitmaps)
{
jpegs.Add(Jpeg.FromBitmap(bitmap, quality));
}

return WrapJpegs(jpegs);
}

private static byte WrapJpegs(List<Jpeg> jpegs)
{
if (jpegs == null || jpegs.Count == 0 || jpegs.FindIndex(b => b.Data.Length == 0) > -1)
throw new ArgumentNullException("Image Data must not be null or empty");

MemoryStream tiffData = new MemoryStream();
BinaryWriter writer = new BinaryWriter(tiffData);
uint offset = 8; // size of header, offset to IFD
ushort entryCount = 14; // entries per IFD

#region IFH - Image file header

// magic number
if (BitConverter.IsLittleEndian)
writer.Write(0x002A4949);
else
writer.Write(0x4D4D002A);

// offset to (first) IFD
writer.Write(offset);

#endregion IFH

#region IFD Image file directory

// write image file directories for each jpeg
for (int i = 0; offset > 0; i++)
{
var jpeg = jpegs[i];
uint width = jpeg.Width;
uint length = jpeg.Height;
uint xres = jpeg.HorizontalResolution;
uint yres = jpeg.VerticalResolution;

// count of entries:
writer.Write(entryCount);

offset += 6 + 12 * (uint)entryCount; // add lengths of entries, entry-count and next-ifd-offset

// TIFF-fields / IFD-entrys:
// {TAG, TYPE (3 = short, 4 = long, 5 = rational), COUNT, VALUE/OFFSET}
uint[,] fields = new uint[,] {
{254, 4, 1, 0}, // NewSubfileType
{256, 4, 1, width}, // ImageWidth
{257, 4, 1, length}, // ImageLength
{258, 3, 3, offset}, // BitsPerSample
{259, 3, 1, 7}, // Compression (new JPEG)
{262, 3, 1, 6}, //PhotometricInterpretation (YCbCr)
{273, 4, 1, offset + 22}, // StripOffsets (offset IFH + entries + values of BitsPerSample & YResolution & XResolution)
{277, 3, 1, 3}, // SamplesPerPixel
{278, 4, 1, length}, // RowsPerStrip
{279, 4, 1, (uint)jpegs[i].Data.LongLength}, // StripByteCounts
{282, 5, 1, offset + 6}, // XResolution (offset IFH + entries + values of BitsPerSample)
{283, 5, 1, offset + 14}, // YResolution (offset IFH + entries + values of BitsPerSample & YResolution)
{284, 3, 1, 1}, // PlanarConfiguration (chunky)
{296, 3, 1, 2} // ResolutionUnit
};

// write fields
for (int f = 0; f < fields.GetLength(0); f++)
{
writer.Write((ushort)fields[f, 0]);
writer.Write((ushort)fields[f, 1]);
writer.Write(fields[f, 2]);
writer.Write(fields[f, 3]);
}

// offset of next IFD
if (i == jpegs.Count - 1)
offset = 0;
else
offset += 22 + (uint)jpegs[i].Data.LongLength; // add values (of fields) length and jpeg length
writer.Write(offset);

#region values of fields

// BitsPerSample
writer.Write((ushort)8);
writer.Write((ushort)8);
writer.Write((ushort)8);

// XResolution
writer.Write(xres);
writer.Write(1);

// YResolution
writer.Write(yres);
writer.Write(1);

#endregion values of fields

// actual image Data
writer.Write(jpegs[i].Data);
}
#endregion IFD

writer.Close();
return tiffData.ToArray();
}
}
}


It could probably be improved by passing in the stream to write to instead of returning a byte array.









share









$endgroup$

















    0












    $begingroup$


    I was searching for a long time how to write multi-page TIFFs with the JPEG encoding. TIFFs support JPEG encoded frames but the built-in encoder in .NET Framework does not have JPEG as a compression option.



    The code is based on the answer to this question: https://stackoverflow.com/questions/14811496/tiff-with-jpeg-compression-much-larger-than-original-jpeg
    but does not rely on the FreeImage library.



    First up, a class to convert BitmapFrame or Bitmap to a JPEG image:



    using System.Drawing;
    using System.Drawing.Imaging;
    using System.IO;
    using System.Windows.Media.Imaging;

    namespace TIFF
    {
    public class Jpeg
    {
    public byte Data;
    public uint Width;
    public uint Height;
    public uint HorizontalResolution;
    public uint VerticalResolution;

    public Jpeg(byte data, uint width, uint height, uint horizontalResolution, uint verticalResolution)
    {
    this.Data = data;
    this.Width = width;
    this.Height = height;
    this.HorizontalResolution = horizontalResolution;
    this.VerticalResolution = verticalResolution;
    }

    public static Jpeg FromBitmapFrame(BitmapFrame bitmap, long quality)
    {
    Jpeg jpeg;

    using (var stream = new MemoryStream())
    {
    JpegBitmapEncoder encoder = new JpegBitmapEncoder();
    encoder.QualityLevel = 90;
    encoder.Frames.Add(bitmap);
    encoder.Save(stream);

    jpeg = new Jpeg(stream.ToArray(), (uint)bitmap.Width, (uint)bitmap.Height, (uint)bitmap.DpiX, (uint)bitmap.DpiY);
    }

    return jpeg;
    }

    public static Jpeg FromBitmap(Bitmap bitmap, long quality)
    {
    Jpeg jpeg;
    using (var stream = new MemoryStream())
    {
    ImageCodecInfo jpgEncoder = GetEncoder(ImageFormat.Jpeg);
    Encoder encoder = Encoder.Quality;
    EncoderParameters parameters = new EncoderParameters(1);
    parameters.Param[0] = new EncoderParameter(encoder, quality);
    bitmap.Save(stream, jpgEncoder, parameters);

    jpeg = new Jpeg(stream.ToArray(), (uint) bitmap.Width, (uint) bitmap.Height, (uint) bitmap.HorizontalResolution, (uint) bitmap.VerticalResolution);
    }

    return jpeg;
    }

    private static ImageCodecInfo GetEncoder(ImageFormat format)
    {
    ImageCodecInfo codecs = ImageCodecInfo.GetImageDecoders();
    foreach (ImageCodecInfo codec in codecs)
    {
    if (codec.FormatID == format.Guid)
    {
    return codec;
    }
    }
    return null;
    }
    }
    }


    Next, a class to create the TIFF image



    using System;
    using System.Collections.Generic;
    using System.Drawing;
    using System.IO;
    using System.Windows.Media.Imaging;

    namespace TIFF
    {
    public static class JpegTiff
    {
    public static byte Create(List<BitmapFrame> frames, long quality)
    {
    List<Jpeg> jpegs = new List<Jpeg>();

    foreach (var frame in frames)
    {
    jpegs.Add(Jpeg.FromBitmapFrame(frame, quality));
    }

    return WrapJpegs(jpegs);
    }

    public static byte Create(List<Bitmap> bitmaps, string filename, long quality)
    {
    List<Jpeg> jpegs = new List<Jpeg>();

    foreach (var bitmap in bitmaps)
    {
    jpegs.Add(Jpeg.FromBitmap(bitmap, quality));
    }

    return WrapJpegs(jpegs);
    }

    private static byte WrapJpegs(List<Jpeg> jpegs)
    {
    if (jpegs == null || jpegs.Count == 0 || jpegs.FindIndex(b => b.Data.Length == 0) > -1)
    throw new ArgumentNullException("Image Data must not be null or empty");

    MemoryStream tiffData = new MemoryStream();
    BinaryWriter writer = new BinaryWriter(tiffData);
    uint offset = 8; // size of header, offset to IFD
    ushort entryCount = 14; // entries per IFD

    #region IFH - Image file header

    // magic number
    if (BitConverter.IsLittleEndian)
    writer.Write(0x002A4949);
    else
    writer.Write(0x4D4D002A);

    // offset to (first) IFD
    writer.Write(offset);

    #endregion IFH

    #region IFD Image file directory

    // write image file directories for each jpeg
    for (int i = 0; offset > 0; i++)
    {
    var jpeg = jpegs[i];
    uint width = jpeg.Width;
    uint length = jpeg.Height;
    uint xres = jpeg.HorizontalResolution;
    uint yres = jpeg.VerticalResolution;

    // count of entries:
    writer.Write(entryCount);

    offset += 6 + 12 * (uint)entryCount; // add lengths of entries, entry-count and next-ifd-offset

    // TIFF-fields / IFD-entrys:
    // {TAG, TYPE (3 = short, 4 = long, 5 = rational), COUNT, VALUE/OFFSET}
    uint[,] fields = new uint[,] {
    {254, 4, 1, 0}, // NewSubfileType
    {256, 4, 1, width}, // ImageWidth
    {257, 4, 1, length}, // ImageLength
    {258, 3, 3, offset}, // BitsPerSample
    {259, 3, 1, 7}, // Compression (new JPEG)
    {262, 3, 1, 6}, //PhotometricInterpretation (YCbCr)
    {273, 4, 1, offset + 22}, // StripOffsets (offset IFH + entries + values of BitsPerSample & YResolution & XResolution)
    {277, 3, 1, 3}, // SamplesPerPixel
    {278, 4, 1, length}, // RowsPerStrip
    {279, 4, 1, (uint)jpegs[i].Data.LongLength}, // StripByteCounts
    {282, 5, 1, offset + 6}, // XResolution (offset IFH + entries + values of BitsPerSample)
    {283, 5, 1, offset + 14}, // YResolution (offset IFH + entries + values of BitsPerSample & YResolution)
    {284, 3, 1, 1}, // PlanarConfiguration (chunky)
    {296, 3, 1, 2} // ResolutionUnit
    };

    // write fields
    for (int f = 0; f < fields.GetLength(0); f++)
    {
    writer.Write((ushort)fields[f, 0]);
    writer.Write((ushort)fields[f, 1]);
    writer.Write(fields[f, 2]);
    writer.Write(fields[f, 3]);
    }

    // offset of next IFD
    if (i == jpegs.Count - 1)
    offset = 0;
    else
    offset += 22 + (uint)jpegs[i].Data.LongLength; // add values (of fields) length and jpeg length
    writer.Write(offset);

    #region values of fields

    // BitsPerSample
    writer.Write((ushort)8);
    writer.Write((ushort)8);
    writer.Write((ushort)8);

    // XResolution
    writer.Write(xres);
    writer.Write(1);

    // YResolution
    writer.Write(yres);
    writer.Write(1);

    #endregion values of fields

    // actual image Data
    writer.Write(jpegs[i].Data);
    }
    #endregion IFD

    writer.Close();
    return tiffData.ToArray();
    }
    }
    }


    It could probably be improved by passing in the stream to write to instead of returning a byte array.









    share









    $endgroup$















      0












      0








      0





      $begingroup$


      I was searching for a long time how to write multi-page TIFFs with the JPEG encoding. TIFFs support JPEG encoded frames but the built-in encoder in .NET Framework does not have JPEG as a compression option.



      The code is based on the answer to this question: https://stackoverflow.com/questions/14811496/tiff-with-jpeg-compression-much-larger-than-original-jpeg
      but does not rely on the FreeImage library.



      First up, a class to convert BitmapFrame or Bitmap to a JPEG image:



      using System.Drawing;
      using System.Drawing.Imaging;
      using System.IO;
      using System.Windows.Media.Imaging;

      namespace TIFF
      {
      public class Jpeg
      {
      public byte Data;
      public uint Width;
      public uint Height;
      public uint HorizontalResolution;
      public uint VerticalResolution;

      public Jpeg(byte data, uint width, uint height, uint horizontalResolution, uint verticalResolution)
      {
      this.Data = data;
      this.Width = width;
      this.Height = height;
      this.HorizontalResolution = horizontalResolution;
      this.VerticalResolution = verticalResolution;
      }

      public static Jpeg FromBitmapFrame(BitmapFrame bitmap, long quality)
      {
      Jpeg jpeg;

      using (var stream = new MemoryStream())
      {
      JpegBitmapEncoder encoder = new JpegBitmapEncoder();
      encoder.QualityLevel = 90;
      encoder.Frames.Add(bitmap);
      encoder.Save(stream);

      jpeg = new Jpeg(stream.ToArray(), (uint)bitmap.Width, (uint)bitmap.Height, (uint)bitmap.DpiX, (uint)bitmap.DpiY);
      }

      return jpeg;
      }

      public static Jpeg FromBitmap(Bitmap bitmap, long quality)
      {
      Jpeg jpeg;
      using (var stream = new MemoryStream())
      {
      ImageCodecInfo jpgEncoder = GetEncoder(ImageFormat.Jpeg);
      Encoder encoder = Encoder.Quality;
      EncoderParameters parameters = new EncoderParameters(1);
      parameters.Param[0] = new EncoderParameter(encoder, quality);
      bitmap.Save(stream, jpgEncoder, parameters);

      jpeg = new Jpeg(stream.ToArray(), (uint) bitmap.Width, (uint) bitmap.Height, (uint) bitmap.HorizontalResolution, (uint) bitmap.VerticalResolution);
      }

      return jpeg;
      }

      private static ImageCodecInfo GetEncoder(ImageFormat format)
      {
      ImageCodecInfo codecs = ImageCodecInfo.GetImageDecoders();
      foreach (ImageCodecInfo codec in codecs)
      {
      if (codec.FormatID == format.Guid)
      {
      return codec;
      }
      }
      return null;
      }
      }
      }


      Next, a class to create the TIFF image



      using System;
      using System.Collections.Generic;
      using System.Drawing;
      using System.IO;
      using System.Windows.Media.Imaging;

      namespace TIFF
      {
      public static class JpegTiff
      {
      public static byte Create(List<BitmapFrame> frames, long quality)
      {
      List<Jpeg> jpegs = new List<Jpeg>();

      foreach (var frame in frames)
      {
      jpegs.Add(Jpeg.FromBitmapFrame(frame, quality));
      }

      return WrapJpegs(jpegs);
      }

      public static byte Create(List<Bitmap> bitmaps, string filename, long quality)
      {
      List<Jpeg> jpegs = new List<Jpeg>();

      foreach (var bitmap in bitmaps)
      {
      jpegs.Add(Jpeg.FromBitmap(bitmap, quality));
      }

      return WrapJpegs(jpegs);
      }

      private static byte WrapJpegs(List<Jpeg> jpegs)
      {
      if (jpegs == null || jpegs.Count == 0 || jpegs.FindIndex(b => b.Data.Length == 0) > -1)
      throw new ArgumentNullException("Image Data must not be null or empty");

      MemoryStream tiffData = new MemoryStream();
      BinaryWriter writer = new BinaryWriter(tiffData);
      uint offset = 8; // size of header, offset to IFD
      ushort entryCount = 14; // entries per IFD

      #region IFH - Image file header

      // magic number
      if (BitConverter.IsLittleEndian)
      writer.Write(0x002A4949);
      else
      writer.Write(0x4D4D002A);

      // offset to (first) IFD
      writer.Write(offset);

      #endregion IFH

      #region IFD Image file directory

      // write image file directories for each jpeg
      for (int i = 0; offset > 0; i++)
      {
      var jpeg = jpegs[i];
      uint width = jpeg.Width;
      uint length = jpeg.Height;
      uint xres = jpeg.HorizontalResolution;
      uint yres = jpeg.VerticalResolution;

      // count of entries:
      writer.Write(entryCount);

      offset += 6 + 12 * (uint)entryCount; // add lengths of entries, entry-count and next-ifd-offset

      // TIFF-fields / IFD-entrys:
      // {TAG, TYPE (3 = short, 4 = long, 5 = rational), COUNT, VALUE/OFFSET}
      uint[,] fields = new uint[,] {
      {254, 4, 1, 0}, // NewSubfileType
      {256, 4, 1, width}, // ImageWidth
      {257, 4, 1, length}, // ImageLength
      {258, 3, 3, offset}, // BitsPerSample
      {259, 3, 1, 7}, // Compression (new JPEG)
      {262, 3, 1, 6}, //PhotometricInterpretation (YCbCr)
      {273, 4, 1, offset + 22}, // StripOffsets (offset IFH + entries + values of BitsPerSample & YResolution & XResolution)
      {277, 3, 1, 3}, // SamplesPerPixel
      {278, 4, 1, length}, // RowsPerStrip
      {279, 4, 1, (uint)jpegs[i].Data.LongLength}, // StripByteCounts
      {282, 5, 1, offset + 6}, // XResolution (offset IFH + entries + values of BitsPerSample)
      {283, 5, 1, offset + 14}, // YResolution (offset IFH + entries + values of BitsPerSample & YResolution)
      {284, 3, 1, 1}, // PlanarConfiguration (chunky)
      {296, 3, 1, 2} // ResolutionUnit
      };

      // write fields
      for (int f = 0; f < fields.GetLength(0); f++)
      {
      writer.Write((ushort)fields[f, 0]);
      writer.Write((ushort)fields[f, 1]);
      writer.Write(fields[f, 2]);
      writer.Write(fields[f, 3]);
      }

      // offset of next IFD
      if (i == jpegs.Count - 1)
      offset = 0;
      else
      offset += 22 + (uint)jpegs[i].Data.LongLength; // add values (of fields) length and jpeg length
      writer.Write(offset);

      #region values of fields

      // BitsPerSample
      writer.Write((ushort)8);
      writer.Write((ushort)8);
      writer.Write((ushort)8);

      // XResolution
      writer.Write(xres);
      writer.Write(1);

      // YResolution
      writer.Write(yres);
      writer.Write(1);

      #endregion values of fields

      // actual image Data
      writer.Write(jpegs[i].Data);
      }
      #endregion IFD

      writer.Close();
      return tiffData.ToArray();
      }
      }
      }


      It could probably be improved by passing in the stream to write to instead of returning a byte array.









      share









      $endgroup$




      I was searching for a long time how to write multi-page TIFFs with the JPEG encoding. TIFFs support JPEG encoded frames but the built-in encoder in .NET Framework does not have JPEG as a compression option.



      The code is based on the answer to this question: https://stackoverflow.com/questions/14811496/tiff-with-jpeg-compression-much-larger-than-original-jpeg
      but does not rely on the FreeImage library.



      First up, a class to convert BitmapFrame or Bitmap to a JPEG image:



      using System.Drawing;
      using System.Drawing.Imaging;
      using System.IO;
      using System.Windows.Media.Imaging;

      namespace TIFF
      {
      public class Jpeg
      {
      public byte Data;
      public uint Width;
      public uint Height;
      public uint HorizontalResolution;
      public uint VerticalResolution;

      public Jpeg(byte data, uint width, uint height, uint horizontalResolution, uint verticalResolution)
      {
      this.Data = data;
      this.Width = width;
      this.Height = height;
      this.HorizontalResolution = horizontalResolution;
      this.VerticalResolution = verticalResolution;
      }

      public static Jpeg FromBitmapFrame(BitmapFrame bitmap, long quality)
      {
      Jpeg jpeg;

      using (var stream = new MemoryStream())
      {
      JpegBitmapEncoder encoder = new JpegBitmapEncoder();
      encoder.QualityLevel = 90;
      encoder.Frames.Add(bitmap);
      encoder.Save(stream);

      jpeg = new Jpeg(stream.ToArray(), (uint)bitmap.Width, (uint)bitmap.Height, (uint)bitmap.DpiX, (uint)bitmap.DpiY);
      }

      return jpeg;
      }

      public static Jpeg FromBitmap(Bitmap bitmap, long quality)
      {
      Jpeg jpeg;
      using (var stream = new MemoryStream())
      {
      ImageCodecInfo jpgEncoder = GetEncoder(ImageFormat.Jpeg);
      Encoder encoder = Encoder.Quality;
      EncoderParameters parameters = new EncoderParameters(1);
      parameters.Param[0] = new EncoderParameter(encoder, quality);
      bitmap.Save(stream, jpgEncoder, parameters);

      jpeg = new Jpeg(stream.ToArray(), (uint) bitmap.Width, (uint) bitmap.Height, (uint) bitmap.HorizontalResolution, (uint) bitmap.VerticalResolution);
      }

      return jpeg;
      }

      private static ImageCodecInfo GetEncoder(ImageFormat format)
      {
      ImageCodecInfo codecs = ImageCodecInfo.GetImageDecoders();
      foreach (ImageCodecInfo codec in codecs)
      {
      if (codec.FormatID == format.Guid)
      {
      return codec;
      }
      }
      return null;
      }
      }
      }


      Next, a class to create the TIFF image



      using System;
      using System.Collections.Generic;
      using System.Drawing;
      using System.IO;
      using System.Windows.Media.Imaging;

      namespace TIFF
      {
      public static class JpegTiff
      {
      public static byte Create(List<BitmapFrame> frames, long quality)
      {
      List<Jpeg> jpegs = new List<Jpeg>();

      foreach (var frame in frames)
      {
      jpegs.Add(Jpeg.FromBitmapFrame(frame, quality));
      }

      return WrapJpegs(jpegs);
      }

      public static byte Create(List<Bitmap> bitmaps, string filename, long quality)
      {
      List<Jpeg> jpegs = new List<Jpeg>();

      foreach (var bitmap in bitmaps)
      {
      jpegs.Add(Jpeg.FromBitmap(bitmap, quality));
      }

      return WrapJpegs(jpegs);
      }

      private static byte WrapJpegs(List<Jpeg> jpegs)
      {
      if (jpegs == null || jpegs.Count == 0 || jpegs.FindIndex(b => b.Data.Length == 0) > -1)
      throw new ArgumentNullException("Image Data must not be null or empty");

      MemoryStream tiffData = new MemoryStream();
      BinaryWriter writer = new BinaryWriter(tiffData);
      uint offset = 8; // size of header, offset to IFD
      ushort entryCount = 14; // entries per IFD

      #region IFH - Image file header

      // magic number
      if (BitConverter.IsLittleEndian)
      writer.Write(0x002A4949);
      else
      writer.Write(0x4D4D002A);

      // offset to (first) IFD
      writer.Write(offset);

      #endregion IFH

      #region IFD Image file directory

      // write image file directories for each jpeg
      for (int i = 0; offset > 0; i++)
      {
      var jpeg = jpegs[i];
      uint width = jpeg.Width;
      uint length = jpeg.Height;
      uint xres = jpeg.HorizontalResolution;
      uint yres = jpeg.VerticalResolution;

      // count of entries:
      writer.Write(entryCount);

      offset += 6 + 12 * (uint)entryCount; // add lengths of entries, entry-count and next-ifd-offset

      // TIFF-fields / IFD-entrys:
      // {TAG, TYPE (3 = short, 4 = long, 5 = rational), COUNT, VALUE/OFFSET}
      uint[,] fields = new uint[,] {
      {254, 4, 1, 0}, // NewSubfileType
      {256, 4, 1, width}, // ImageWidth
      {257, 4, 1, length}, // ImageLength
      {258, 3, 3, offset}, // BitsPerSample
      {259, 3, 1, 7}, // Compression (new JPEG)
      {262, 3, 1, 6}, //PhotometricInterpretation (YCbCr)
      {273, 4, 1, offset + 22}, // StripOffsets (offset IFH + entries + values of BitsPerSample & YResolution & XResolution)
      {277, 3, 1, 3}, // SamplesPerPixel
      {278, 4, 1, length}, // RowsPerStrip
      {279, 4, 1, (uint)jpegs[i].Data.LongLength}, // StripByteCounts
      {282, 5, 1, offset + 6}, // XResolution (offset IFH + entries + values of BitsPerSample)
      {283, 5, 1, offset + 14}, // YResolution (offset IFH + entries + values of BitsPerSample & YResolution)
      {284, 3, 1, 1}, // PlanarConfiguration (chunky)
      {296, 3, 1, 2} // ResolutionUnit
      };

      // write fields
      for (int f = 0; f < fields.GetLength(0); f++)
      {
      writer.Write((ushort)fields[f, 0]);
      writer.Write((ushort)fields[f, 1]);
      writer.Write(fields[f, 2]);
      writer.Write(fields[f, 3]);
      }

      // offset of next IFD
      if (i == jpegs.Count - 1)
      offset = 0;
      else
      offset += 22 + (uint)jpegs[i].Data.LongLength; // add values (of fields) length and jpeg length
      writer.Write(offset);

      #region values of fields

      // BitsPerSample
      writer.Write((ushort)8);
      writer.Write((ushort)8);
      writer.Write((ushort)8);

      // XResolution
      writer.Write(xres);
      writer.Write(1);

      // YResolution
      writer.Write(yres);
      writer.Write(1);

      #endregion values of fields

      // actual image Data
      writer.Write(jpegs[i].Data);
      }
      #endregion IFD

      writer.Close();
      return tiffData.ToArray();
      }
      }
      }


      It could probably be improved by passing in the stream to write to instead of returning a byte array.







      image wpf compression





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      asked 6 mins ago









      geometrikalgeometrikal

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