Tonescales for geographically localized digital rendition of people
View Patent ↗In a method and system for processing a photographic image having lightness values, L*, representing one of the colorimetric values of an original scene, the photographic image is transformed. The transformed image has a gamma as a function of CIE 1976 L*, which includes a dark region having a rising slope, a light region having a falling slope, and a plateau region having a slope constantly within 5 percent of a maximum value in said plateau region. The rising slope is at least twice as large as the absolute value of the falling slope. The plateau region is between 10 L* and 30 L* wide. Gamma is a derivative of visually perceived reproduced CIE 1976 L* versus scene CIE 1976 L*. Gamma has a maximum slope between 1.5 and 2.0.
1. A method implemented at least in part by a microprocessor-based unit, the method for providing image-processing parameters for an image, the method comprising the steps of:
acquiring information about a device, the device being an image-acquisition device that acquired or is acquiring the image or an output device with which the image is to be reproduced;
providing a regional image processing parameter based at least upon the information, the regional image processing parameter relating to geographic location; and
storing the regional image processing parameter in a computer-readable storage medium.
2. The method of claim 1 , wherein the device is an image-acquisition device and the information about the device is a device model.
3. The method of claim 2 , wherein the device is a camera and the information about the device is a camera model.
4. The method of claim 1 , wherein the regional image processing parameter relates to reproduction of skin tones.
5. A computer-readable storage medium storing instructions configured to cause a microprocessor-based unit to implement a method for providing image-processing parameters for an image, wherein the instructions comprise:
instructions for acquiring information about a device, the device being an image-acquisition device that acquired or is acquiring the image or an output device with which the image is to be reproduced;
instructions for providing a regional image processing parameter based at least upon the information, the regional image processing parameter relating to geographic location; and
instructions for storing the regional image processing parameter in a computer-readable storage medium.
6. The computer-readable storage medium of claim 5 , wherein the device is an image-acquisition device and the information about the device is a device model.
7. The computer-readable storage medium of claim 6 , wherein the device is a camera and the information about the device is a camera model.
8. The computer-readable storage medium of claim 5 , wherein the regional image processing parameter relates to reproduction of skin tones.
9. A system comprising:
a microprocessor-based unit; and
a computer readable storage medium communicatively connected to the microprocessor-based unit and storing instructions configured to cause the data processing system to implement a method for providing image-processing parameters for an image, wherein the instructions comprise:
instructions for acquiring information about a device, the device being an image-acquisition device that acquired or is acquiring the image or an output device with which the image is to be reproduced;
instructions for providing a regional image processing parameter based at least upon the information, the regional image processing parameter relating to geographic location; and
instructions for storing the regional image processing parameter in a computer-readable storage medium.
10. The system of claim 9 , wherein the device is an image-acquisition device and the information about the device is a device model.
11. The system of claim 10 , wherein the device is a camera and the information about the device is a camera model.
12. The system of claim 9 , wherein the regional image processing parameter relates to reproduction of skin tones.