Patent Document ID: 7574335
Application ID: 10777566
Patent Flag: 1

Claim One:
1. A computer-implemented method comprising: receiving an image having color information; receiving a transfer function, wherein the transfer function specifies a set of output values corresponding to a set of input values; iteratively, until a termination flag is set: receiving a first power law function; generating an auxiliary function including modifying the transfer function using local differences between the transfer function and the first power law function; defining a second power law function by fitting a power law function to the auxiliary function; calculating a modelling error between the second power law function and the transfer function, wherein the modelling error is an error value obtained from local differences between the second power law function and the transfer function; providing the second power law function as the first power law function for the next iteration when the modelling error is greater than or equal to a predetermined value; and setting the termination flag when the modelling error is less than the predetermined value; using the second power law function to calculate a gamma value that is used to adjust the color information of the image; and rendering, using a computer, the image using the adjusted color information, where in a first iteration, the first power law function is defined by fitting a power law function to the transfer function.