1. An image conversion system for altering an image to adjust the overall brightness of the image when displayed, the image conversion system comprising: a luminance transformer, the luminance transformer receiving image data, the luminance transformer transforming each original color in the image data to a transformed color having a new luminance, the new luminance selected to be at least proximate to a desired luminance while maintaining hues of the original color; and a color adjuster, the color adjuster modifying the transformed color to achieve the desired luminance in the transformed color if the new luminance does not equal the desired luminance, and wherein the color adjuster modifies the transformed color using a weighted sum of the transformed color and a brightest color.