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Conventional enhancements for the color display of multispectral images are usually based on independent contrast modifications (“stretches”) of three image channels. This approach generally does not produce colorful pictures if the image channels are strongly correlated. Procedures that selectively emphasize the weakly correlated component of the image data may better utilize the full range of colors. In Part I of this series of articles, two such methods were discussed that exaggerated color saturation without greatly modifying hue. These methods utilized principal-component analysis and HSI transformation of the image data. Herein we discuss two other methods, based on ratioing Nike Shox Nz Pas Cher of data from different Achat Basket Nike Shox image channels. In the first approach, images of the ratioed data are “stretched” Nike Shox Nz Pas Cher and assigned primary colors for display as color pictures. An alternative ratio method uses the difference, normalized to the intensity, instead of the ratio itself. Hues in pictures thus enhanced bear no resemblance to those in the unenhanced picture: hence, interpretation may be difficult. In the second approach, the intensity for each of three image channels is ratioed, pixel by pixel, to the sum of the intensities. Thus the data are transformed to image-domain “chromaticity” coordinates. These data are next “stretched” and then multiplied by the summed intensities to return them to the original coordinates for display. This technique is similar to those of Part I in that the hues need not be greatly altered.
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