Difference between a BitmapFrame and BitmapImage in WPF

Question

What is the difference between a BitmapFrame and BitmapImage in WPF? Where would you use each (ie. why would you use a BitmapFrame rather than a BitmapImage?)

Answer 1

The accepted answer is incomplete (not to suggest that my answer is complete either) and my addition may help someone somewhere.

The reason (albeit the only reason) I use a BitmapFrame is when I access the individual frames of a multiple-framed TIFF image using the TiffBitmapDecoder class. For example,

TiffBitmapDecoder decoder = new TiffBitmapDecoder(
    new Uri(filename), 
    BitmapCreateOptions.None, 
    BitmapCacheOption.None);

for (int frameIndex = 0; frameIndex < decoder.Frames.Count; frameIndex++)
{
    BitmapFrame frame = decoder.Frames[frameIndex];
    // Do something with the frame
    // (it inherits from BitmapSource, so the options are wide open)
}