Pan sharpening involves fusing images taken at different resolutions into one high-resolution image. This
software reads in two images: one high-resolution gray-scale image (8 bits/pixel) and one low-resolution color
image (24 bits/pixel). It then creates a high-resolution color image. It is assumed that the images are already
registered and have the same dimensions. A couple of examples are given below.
Images on the left are high-resolution gray scale images, images in the middle are low-resolution color images, and images
on the right are the fused images. These images are courtesy of USGS.
To obtain a license for this software, follow this link =>

      Pan sharpening
Image Registration and Fusion Systems  
The pan sharpening software reads in a high-resolution gray-scale image and a low-resolution color image,
combine the images, and displays the result side-by-side with the gray-scale or the color image (to be
chosen interactively), as shown below. For very large images, the images are scaled down to fit the screen.
The user may pan and zoom the displayed images to view local details, as shown below. The pan/zoom
operations of the two windows are synchronized to maximize viewing effectiveness.
The software displays the provided gray-scale image (top) or color image (middle) in the left window and the combined image
in the right window side-by-side for comparison. The images can be scaled and translated (bottom) to compare areas of
interest in images before and after fusion.