Hi, this is a very simple problem that I am not sure how to fix.  After stitching a panorama in APG, I edit the .tiff or .psd file in photoshop CS5.  I usually crop the panoramas to remove the black around the edges.  Here is my problem:  I will save as my cropped panorama as a .tiff file, but after looking at the new file, it still has the black around the edges.  It is not cropped.  Any editing I do to the panorama, such as altering white balance, contrast etc. all remain on the photograph, except for the cropping.  When I save the panorama as a jpeg file, it works fine, the cropping is there.  Can anybody help explain what I am doing wrong?
Thank you