Claims
- 1. A computer-implemented process of protecting an electronically stored image from unauthorized use in a first color space, comprising:
- storing the image in a second color space;
- altering a constituent second color space component of the stored image responsive to relative magnitude of said component to form an altered image by making a first alteration to first image portions having characteristics above a threshold and by making a second alteration to second image portions having characteristics below the threshold; and
- distributing the altered image for use in the second color space.
- 2. A computer-implemented process as in claim 1, wherein the first alteration includes addition of an offset, and the second alteration includes subtraction of the offset.
- 3. A computer-implemented process as in claim 1, wherein the threshold corresponds to brightness of a predetermined color component.
- 4. A computer-implemented process as in claim 3, wherein the predetermined color component is blue.
Parent Case Info
This is a continuation of application Ser. No. 08/478,401 filed on Jun. 7, 1995, now U.S. Pat. No. 5,617,119 which is a divisional application of Ser. No. 08/255,379 filed on Jun. 8, 1994, now U.S. Pat. No. 5,493,677.
US Referenced Citations (12)
Non-Patent Literature Citations (1)
Entry |
Steve Walton, "Image Authentication for a slippery New Age", Dr. Dobb's Journal, pp. 18-24, 84-87, Apr. 1995. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
255379 |
Jun 1994 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
478401 |
Jun 1995 |
|