The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B7. Beijing 2008
Figure 1. Comparison of the visual quality of the four testing images under the same display conditions (the images are enlarged 2
times to show details)
To prove that the four images have the same quality, the
individual bands of each of the four testing images are also
compared through overplaying the same band of different
images in one image under the same stretching condition, but
displayed using different colours (Figure 2). If there is any
difference between corresponding bands of the images, the
overlaid image will appear colour in the areas where differences
exist. Otherwise, the overlaid bands will appear as a grey
image, as if only one band were displayed. A close check of the
images in Figure 2 shows that no colour appears in any of the
images, which proves that the four images have the same
quality when individual bands are compared.