I have to build an application in .Net (3.5) to pick up a TIFF file saved from another piece of software and convert it into a PNG so that it can be rendered easily in Inter
System.Drawing.
Bitmap.FromFile("your image.tif")
.Save("your image.png", System.Drawing.Imaging.ImageFormat.Png);
Please, also check this: Convert Tiff Images to Gif/Jpeg
In C# / .NET, it is probably as easy as:
using System.Drawing;
using System.Drawing.Imaging;
using (var tiff = new Bitmap("my_tiff_file.tif")) {
tiff.Save("output.jpg", ImageFormat.Jpeg);
}
If for some reason System.Drawing.Imaging won't read your TIFF files, check out an open-source project called ImageMagick, which will read and write just about any image format imaginable. Worst case scenario you'll need to call ImageMagick's convert.exe via Process.Start() in .NET - not elegant, but it does work.