CODEWITHSUNDEEP
c#tiff
Philo
Philo

Reputation: 1989

Tiff file compression with C#

I have a tiff file which during original creation and saving has compression type "LZW".

System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(800, 1000); 
Graphics g = Graphics.FromImage(bitmap);
fileName = saveDirectory + id + ".tif";
bitmap.Save(fileName, ImageFormat.Tiff);

So I am trying to change its compression to CCIT:-

Bitmap myBitmap;
myBitmap = new Bitmap(fileName);
ImageCodecInfo myImageCodecInfo;
myImageCodecInfo = GetEncoderInfo("image/tiff");
System.Drawing.Imaging.Encoder myEncoder;
myEncoder = System.Drawing.Imaging.Encoder.Compression;
EncoderParameters myEncoderParameters;
myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter;      
myEncoderParameter = new EncoderParameter(myEncoder,(long)EncoderValue.CompressionCCITT4);
myEncoderParameters.Param[0] = myEncoderParameter;
myBitmap.Save(new_fileName);

    private static ImageCodecInfo GetEncoderInfo(String mimeType)
    {
      int j;
      ImageCodecInfo[] encoders;
      encoders = ImageCodecInfo.GetImageEncoders();
      for (j = 0; j < encoders.Length; ++j)
        {
            if (encoders[j].MimeType == mimeType)
            return encoders[j];
        }
      return null;
    }

However, after running through the process, my file properties still says that it is of the "LZW compression" type.

Can anyone explain to me where I am going wrong with this?

Upvotes: 9

Views: 14807

Answers (1)

Nick Gotch
Nick Gotch

Reputation: 9407

Change your last line to:

myBitmap.Save(new_fileName, myImageCodecInfo, myEncoderParameters);

Upvotes: 12

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