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  Indian J Med Microbiol
 

Figure 1: Illustrations on the effect of color shifting and scaling[23]. (a) The RGB color cube illustrating the effect of scaling to the luminance of the image. The length of vector CP is related to the luminance of the image pixel and the triangle with vertices at the maximum values of the R, G, and B axes is called the Maxwell triangle. Scaling the RGB values increases or decreases the length of the vector which would in turn vary the luminance of the image pixel; (b) An illustration on the effect of shifting. While shifting the original color vector OQ to OQ' reduces the saturation of the image pixel, shifting the vector OQ farther from the gray line and closer to the RGB cube increases the saturation of the pixel. Hence the saturation of an image can be manipulated by shifting the color vector by an appropriate amount

Figure 1: Illustrations on the effect of color shifting and scaling[23]. (a) The RGB color cube illustrating the effect of scaling to the luminance of the image. The length of vector CP is related to the luminance of the image pixel and the triangle with vertices at the maximum values of the R, G, and B axes is called the Maxwell triangle. Scaling the RGB values increases or decreases the length of the vector which would in turn vary the luminance of the image pixel; (b) An illustration on the effect of shifting. While shifting the original color vector OQ to OQ' reduces the saturation of the image pixel, shifting the vector OQ farther from the gray line and closer to the RGB cube increases the saturation of the pixel. Hence the saturation of an image can be manipulated by shifting the color vector by an appropriate amount