2.35:1 or 2.39:1 aspect ratio is the current widescreen cinema standard and results in "black bars" on top and bottom of the screen when accurately displayed on a common monitor or television:
2.40:1 image as shown on a 1.78:1 (16x9)TV (CNET)
Wide cinema aspect ratio may be cropped to fit TV screens (16:9 and 4:3):
Home releases (red line) can also have a larger aspect ratio than the theatrical version (yellow line) (see open matte):
Can I expect that retail film releases have preserved the film's original aspect ratio or is there a chance that the image has been cut?