TIFF is not really an image but sometimes can be just a container of images.
If it's a container of bmp, jpeg, etc. common formats it can be easily read through Python or C# libraries.
However, occationally it is used by Fax and contains fax encoding images with various types, CCITT T3 T4 etc. which are not supported in Python well.
So here is a piece of .Net C# program for reading that type of TIFF files and convert it to bmp image.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Media.Imaging; //add reference to PresentationCore.dll if needed
using System.IO;
using System.Drawing; //add reference to System.Drawing.dll if needed
using System.Drawing.Imaging;
namespace ExtractTiff
{
class Program
{
static void Main(string[] args)
{
String input_folder = @"C:\attachments";
String save_folder = @"C:\images";
new Program().convert_tiff(input_folder, save_folder);
Console.WriteLine("done");
Console.Read();
}
private void convert_tiff(String input_folder, String save_folder)
{
foreach (String dir in Directory.GetDirectories(input_folder))
{
convert_tiff(dir, save_folder);
}
foreach (String file in Directory.GetFiles(input_folder))
{
if (file.ToLower().EndsWith(".tiff") ||file.ToLower().EndsWith(".tif"))
{
try
{
// Open a Stream and decode a TIFF image.
Stream imageStreamSource = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
TiffBitmapDecoder decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.None);
for (int page = 0; page < decoder.Frames.Count; page++)
{
BitmapSource bitmapSource = decoder.Frames[page];
int pixel_w = bitmapSource.PixelWidth;
int pixel_h = bitmapSource.PixelHeight;
double scale_x_to_y = bitmapSource.DpiX / bitmapSource.DpiY;
// Draw the Image.
BitmapEncoder encoder = new BmpBitmapEncoder();
BitmapFrame frame = BitmapFrame.Create(bitmapSource);
encoder.Frames.Add(frame);
MemoryStream memory = new MemoryStream();
encoder.Save(memory);
Bitmap bitmap = new Bitmap(memory);
Bitmap scaled = new Bitmap(bitmap, new Size((int)(pixel_w / scale_x_to_y), pixel_h));
String file_name = Path.GetFileNameWithoutExtension(file);
if (page > 0)
{
file_name += "_page" + (page + 1);
}
file_name += ".bmp";
Console.WriteLine(file_name);
scaled.Save(Path.Combine(save_folder, file_name), ImageFormat.Bmp);
scaled.Dispose();
bitmap.Dispose();
memory.Dispose();
}
}
catch (Exception e)
{
Console.WriteLine("======= " + file + " | " + e.Message);
}
}
}
}
}
}