Methods and apparatus for calibrating a color display
AssigneeRah Color Technologies LLC
InventorRichard Holub
Life of this patent
Estimating the term…
Abstract
Improved methods are provided for calibrating color on a color display coupled to a computer, which are useful for obtaining calibrated data in a virtual proof network for enabling different color devices to render consistent color. Methods involve user interactions with screens on the display to set color display parameters. An apparatus is also provided for calibrating a sensor which may be used for measuring color of a display in one or more of these methods.
Claims20
A method for calibrating a color display coupled to a computer system comprising the steps of:
- displaying one or more screens on said display;
- and
- adjusting at least one display control of the display when said one or more screens are displayed to provide superposition of color of the display.
A system for calibrating a sensor having one or more channels which is useful for calibrating display surfaces comprising:
- a reflective surface;
- a measurement sensor and a reference sensor each directed toward one or more display surfaces;
- a computer system coupled to the display, measurement sensor and reference sensor;
- and
- a monochromator for illuminating the reflective surface with light of certain color in which the color of said light is controllable by the computer system and said measurement and reference sensors are capable of measuring the color of said reflective surface when illuminated by said monochromator to calibrate the measurement sensor in accordance with the measurements taken by both the measurement sensor and the reference sensor.
A method of calibrating color devices associated in a network comprising the steps of:
- adjusting one or more devices to match one or more reference images;
- measuring adjusted calibration parameters of said devices;
- and
- storing said calibration parameters for use in calibrating said devices.
A method for modeling the color of a color display having a plurality of color channels comprising the steps of:
- comparing a displayed screen color to a color reference;
- changing the screen color to match the color reference;
- recording the color of screen which matches the color reference;
- measuring the displayed screen color which matches the color reference with a sensor, and storing the sensor measurement with the recorded screen color;
- repeating said comparing, changing, recording, and measuring steps with different color references;
- and
- modeling the relationship between the measurements and associated recorded screen colors to provide normative data of the color of the screen.
A method for calibrating a color display comprising the steps of:
- providing a user interface screen on the display with a plurality of patches ranging from low to high gray scale values;
- comparing the displayed patches with a reference associated with said patches;
- displaying on said user interface screen indicator levels of the gray scale value of each of said displayed patches and changing the indicator levels of one or more of said patches to match the associated patches of the reference;
- and
- updating the calibration of the display in accordance with the values of the displayed gray scale patches when said displayed patches match the associated patches of the reference.
A system of colorimetry of a sensor comprising:
- a sensor having at least one channel of spectral sensitivity which does not match the spectral sensitivity of color viewed by a human;
- a color reference defining a mixture of a plurality of colorants each providing a spectral distribution;
- said sensor measuring the color of said reference;
- and
- a computer for producing a spectrum of a mixture of said colorants, convolving the spectral sensitivity of said sensor with the spectral distribution of said colorants to provide at least one integrated spectral value, and determining when said value corresponds to said measurement by said sensor to provide color coordinates of said mixture in a Standard Observer coordinate system.
Dependencies are inferred from the claim text.