In the mid-1980s, image fusion received significant attention from researchers in remote sensing and image processing, as SPOT 1 (launched in 1986) provided high-resolution (10m) Pan images and low-resolution (20m) MS images. Since that time, much research has been done to develop effective image fusion techniques. For example, a review paper on image fusion techniques, published in 1998 in the International Journal of Remote Sensing, referenced approximately 150 academic papers on image fusion. Since 1998, further scientific papers on image fusion have been published with the emphasis on improving fusion quality and reducing color distortion. Among the hundreds of variations of image fusion techniques, the most popular and effective are, for example, IHS (Intensity, Hue, Saturation), PCA (Principal Components Analysis), arithmetic combinations, and wavelet base fusion.