Patent ID: 7982707

Claim:
A method for adjusting input image code values for display with a reduced source light power level, said method comprising: a) determining a source light power level, P; b) determining a display black level corresponding to said source light power level, B; c) determining a maximum display output corresponding to said source light power level, W; d) determining a display gamma value, γ; e) determining a maximum input code value, cvMax; f) determining a minimum input code value, cvMin; g) calculating a boost slope, α; h) calculating a boost intercept, β; i) calculating a least fidelity point, LFP; j) calculating a maximum fidelity point, MFP; k) defining a tone scale adjustment curve using a hardware device, wherein said tone scale adjustment curve comprises: i) a first region defined by image code values between a minimum input image code value, ImageMinCV, and said LFP, wherein said tone scale adjustment curve in said first region comprises a first function relating image code values to display code values; ii) a second region defined by image code values between said LFP and said MFP, wherein said tone scale adjustment curve in said second region comprises a second function relating image code values to display code values; iii) a third region defined by image code values between said MFP and a maximum input image code value, ImageMaxCV, wherein said tone scale adjustment curve in said third region comprises a third function relating image code values to display code values; l) receiving an input image comprising input image code values representing a, tangible object; and m) applying said tone scale adjustment curve to said input image code values.