Patent ID: 8094957

Claim:
A method of modifying the brightness of a color pixel, applied to an image processing means, comprising the steps of: providing a first, a second, and a third image value, wherein the first, the second and the third image values are associated with the brightness of the color pixel; calculating a first offset between the first image value and a first expected image value by subtracting means only; calculating a first difference between the first and the second image values, and a second difference between the first and the third image values by the subtracting means only; defining a linear relation based on the first offset and the first image value; obtaining a second offset based on the first difference according to the linear relation, and a third offset based on the second difference according to the linear relation by an adding means only; and generating a second expected image value by adding the second image value and the second offset, and a third expected image value by adding the third image value and the third offset, wherein the linear relation reflects an enlargement ratio, and the enlargement ratio is the same among the first offset, the second offset and the third offset.