Question

i am in trouble. how to read 1MB .tif file with bitmap class in c#. i used below code but getting error “Out of memory”.I searched google lot but not find any answer yet.

string imgPath;
            imgPath = @"C:\Documents and Settings\shree\Desktop\2012.06.09.15.35.42.2320.tif";
            Image newImage = Image.FromFile(imgPath);

            Bitmap img;
            img = new Bitmap(imgPath, true);

            MessageBox.Show("Width: "+ img.Width + " Height: " + img.Height);

Answer 1

If you just need to read the width and height of the file without loading it in memory you could use WPF’s BitmapDecoder class:

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

class Program
{
    static void Main()
    {
        using (var stream = File.OpenRead(@"c:\work\some_huge_image.tif"))
        {
            var decoder = BitmapDecoder.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.None);
            var frame = decoder.Frames.First();
            Console.WriteLine(
                "width: {0}, height: {1}", 
                frame.PixelWidth, 
                frame.PixelHeight
            );
        }
    }
}

If for some reason you are stuck in some pre-.NET 3.0 era you could look at the image metadata to extract this information without loading the entire image in memory as shown in the following answer.