The Standard Data Products (.imq extension) are compressed and require decompression software. The Standard Decompressed Data Products (PDS format, .img extension) can simply be downloaded for viewing by clicking the appropriate link. You will need the NASAView software to view all decompressed images.
Viewing and Downloading Images
You can also either view or download the Actual MOC image (JPEG Version) and two related "context" images. To view these images, select (click) the appropriate browse image. On the resulting page, you can then download by selecting the image using the right-mouse button to activate the "Save image" option. You may also download the image directly from the browse page; select the appropriate image by using the right-mouse button to activate the "Save Link" option. The browse images themselves may also be downloaded by using this procedure.
(mouse-button options may vary depending on your platform and browser)
Once you have downloaded the image, you can use compatible image display software to view or work with the image.