Method and apparatus for creating and displaying faithfull color images on a computer display

• US 5,502,458 A
• Filed: 11/10/1992
• Issued: 03/26/1996
• Est. Priority Date: 11/10/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Braudaway, Gordon W., Delp, Helen R.
• Primary Examiner(s): Weldon, Ulysses
• Application Number:
  US07/974,862
• Time in Patent Office: 1,232 Days
• Field of Search: 348/180, 348/470, 348/474, 348/557, 348/558, 348/517, 348/519, 348/520, 348/630, 348/631, 348/488, 348/453, 348/496, 348/502, 395/131, 345/153-155
• US Class Current: 345/593
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables

Abstract

Faithful color images are created in an efficient manner for display on a specific computer display. A standard computer system generates a palette calibration table, based on information about a standard display. The standard computer system then creates a device independent image from the palette calibration table and from an original image. The palette calibration table and device independent image are then transmitted to a specific computer system. The specific computer system receives the palette calibration table and device independent image from the standard computer system. It calculates a display specific palette from the palette calibration table and from information about the specific display. The specific computer system then generates the faithful color image for display by sending the device independent image and the display specific palette to the display adapter in the specific computer system.

Claims

1. A method in a standard computer system for creating information used to display a faithful color image on a specific computer display connected to a specific computer system comprising the steps of:

generating a palette calibration table and a display independent normalized palette table from information about a standard display, said generating step comprising the substeps of,

obtaining a standard pale from said standard computer system;

determining CIE XYZ* values flora said standard display, said CIE XYZ* values being standard tristimulus values; and

generating said palette calibration table from said CIE XYZ* values and said standard palette;

creating a display independent image from said display independent normalized palette table and from an original image;

transmitting said palette calibration table to said specific computer display via a communications path; and

transmitting said display independent image to said specific computer display via a communications path.

2. A method in a standard computer system for creating information used to display a faithful color image on a specific computer display connected to a specific computer system, comprising the steps of:

generating a palette calibration table and a display independent normalized palette table from information about a standard display;

creating a display independent image from said display independent normalized palette table and from an original image, said creating step comprising the substeps of,

determining a XYZ-RGB matrix M* for said standard display, said matrix M* being comprised of CIE XYZ standard tristimulus values and display specific RGB tristimulus value;

obtaining a standard palette from said standard computer system;

creating said display independent palette table from said XYZ-RGB matrix M* and said standard palette;

creating an RGB image from said original image;

creating said display independent image from said RGB image and said display independent palette table;

transmitting said palette calibration table to said specific computer display via a communications path; and

transmitting said display independent image to said specific computer display via a communications path.