1. A method enhancing a digital image, comprising the steps of: (a) using software executing from a machine-readable physical medium on a computerized appliance, selecting a digital image as an original image to be enhanced, wherein pixel values for an image attribute in the original image range from zero to a maximum value; (b) normalizing pixel values in the original image to values between 0 and 1 proportionally; (b) calculating new normalized pixel values for a first altered image using an equation p o =p i /(1−C+Cp i ) where p o is a new normalized (output) pixel value for the first altered image, generated from p i , which is an original (input) pixel value at the same image location, and a value C 1 is selected for constant C in the equation, C 1 having a value between 0 and 1 inclusive, which, once selected, remains the same for generating all normalized pixel values for the first altered image; c) calculating new normalized pixel values for a second altered image using the same equation and procedure as for the first altered image, with a value C 2 selected for constant C, also between 0 and 1 inclusive, but unequal C 1 ; d) producing actual pixel values for the first and second altered images from the calculated normalized values; e) displaying the first and second altered images to a user for selection; f) selecting one of the first and second altered images by the user as preferable.