Creating tiff file, with LZW compression (default):-
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(800, 1000);
Graphics g = Graphics.FromImage(bitmap);
g.DrawString("Name: " + Name.Text, outputFont, Brushes.Black, new PointF(0, 20));
g.DrawString("Date Of Birth: " + Date_Of_Birth.Text, outputFont, Brushes.Black, new PointF(0, 40));
g.DrawString("Address: " + Address.Text, outputFont, Brushes.Black, new PointF(0, 60));
g.DrawString("City: " + City.Text, outputFont, Brushes.Black, new PointF(0, 80));
g.DrawString("State: " + State.Text, outputFont, Brushes.Black, new PointF(0, 100));
g.DrawString("Zip Code: " + Zip_Code.Text, outputFont, Brushes.Black, new PointF(0, 120));
g.DrawString("Phone: " + Phone.Text, outputFont, Brushes.Black, new PointF(0, 140));
g.DrawString(" ID: " + ID.Text, outputFont, Brushes.Black, new PointF(0, 160));
fileName = saveDirectory + id + ".tif";
bitmap.Save(fileName, ImageFormat.Tiff);
So I am trying to change its compression to CCITT:-
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, myImageCodecInfo, myEncoderParameters);
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;
}
The process works and I can see that the compression type of my tiff file has correctly been modified to CCITT (by right clicking on the output file and checking properties). However when I try to open it, the whole image in black.. nothing is on it.
When I change the compression type to LZW or None or RLE then the tiff file is once again a viewable image.
Unfortunately I need the CCITT format only. Can anyone help me figure this out?
Update:
Even though the method now works on my windows 7 32 bit OS using Visual studio 2010.. Once published to the Windows 2008 server, the solution doesn't work (only for CCITT compression techniques). The following link explains why.
http://social.msdn.microsoft.com/Forums/vstudio/en-US/1585c562-f7a9-4cfd-9674-6855ffaa8653/parameter-is-not-valid-for-compressionccitt4-on-windows-server-2003-and-2008?forum=netfxbcl
As per this article, this is what I am trying but can't get the compression to apply to the original image:-
int width = 800;
int height = 1000;
int stride = width/8;
byte[] pixels = new byte[height*stride];
// Try creating a new image with a custom palette.
List<System.Windows.Media.Color> colors = new List<System.Windows.Media.Color>();
colors.Add(System.Windows.Media.Colors.Red);
colors.Add(System.Windows.Media.Colors.Blue);
colors.Add(System.Windows.Media.Colors.Green);
BitmapPalette myPalette = new BitmapPalette(colors);
// Creates a new empty image with the pre-defined palette
BitmapSource image = BitmapSource.Create(
width,
height,
96,
96,
System.Windows.Media.PixelFormats.BlackWhite,
myPalette,
pixels,
stride);
FileStream stream = new FileStream(Original_File, FileMode.Create);
TiffBitmapEncoder encoder = new TiffBitmapEncoder();
encoder.Compression = TiffCompressOption.Ccitt4;
encoder.Frames.Add(BitmapFrame.Create(image));
encoder.Save(stream);
However, my end result is a file with the correct compression, but a solid black background. Deja Vu.
