RASTER OPERATION TABLE CONVERSION FOR COLOR SPACES

• US 20080192066A1
• Filed: 02/13/2007
• Published: 08/14/2008
• Est. Priority Date: 02/13/2007
• Status: Abandoned Application

• Current Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: CHANG, CHING-WEI
• Application Number:
  US11/674,616
• Publication Number:
  US 20080192066A1
• Time in Patent Office: Days
• US Class Current: 345/601
• CPC Class Codes: G06F 3/13 Digital output to plotter ; Cooperation and interconnection of the plotter with other functional units
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables

Abstract

A conversion table includes a conversion index number corresponding to a logical operation identified in a raster table. The conversion index number provided in the conversion table is mapped from a reference index number provided in the raster table, wherein the reference index number is associated with a raster image operation of one or more RGB operands defined in a first color space. The logical operation may be performed on one or more operands defined in a second color space.

Claims

1. A conversion table comprising:

a conversion index number corresponding to a logical operation identified in a raster table, where the conversion index number provided in the conversion table is mapped from a reference index number provided in the raster table associated with a raster image operation of one or more RGB operands defined in a first color space, to provide the logical operation associated with one or more operands defined in a second color space.

2. The conversion table according to claim 1 where the conversion index number is mapped from the reference index number according to the following mapping rule:

the logical operation of the one or more operands in the second color space is equivalent to the raster image operation performed on the one or more RGB operands.

3. The conversion table according to claim 1 where the conversion index number is mapped from the reference index number according to the following mapping rules:

the reference index number associated with a white image maps to the conversion index number associated with a black image;

the reference index number associated with the black image maps to the conversion index number associated with the white image;

the reference index number including a logical function OR is mapped to a conversion index number that replaces OR with AND;

the reference index number including a logical function AND is mapped to a conversion index number that replaces OR with AND; and

the reference index number including a logical function of XOR is mapped to a conversion index number that inverts the XOR logical function.

4. The conversion table according to claim 3 where the reference index number is mapped from the conversion index number according to the additional following mapping rules:

the reference index number including a single operand is mapped to itself; and

the reference index number including a logical function of a single NOT is mapped to itself.

5. The conversion table according to claim 1 where the first color space is associated with a projected image and the second color space is associated with printed media.

6. The conversion table according to claim 1 where the logical operation includes AND, OR, XOR and NOT and the one or more operands include source, texture and destination.

7. A system for selecting a raster image operation comprising:

a raster macro table including a reference index number representing a first logical operation of one or more RGB operands in a first color space; and

a lookup table including a conversion index number representing a second logical operation of one or more operands in a second color space, the reference index number being mapped to the conversion index number, where a designation of the reference index number results in an application of the second logical operation rather than, and different from, the first logical operation.

8. The system according to claim 7 where the reference index number is mapped to the conversion index number according to the following mapping rule:

the first logical operation of the one or more operands associated with the conversion index number is equivalent to the second logical operation performed on the one or more RGB operands.

9. The system according to claim 7 where the reference index number is mapped to the conversion index number according to the following mapping rules:

the reference index number associated with a white image maps to the conversion index number associated with a black image;

the reference index number associated with the black image maps to the conversion index number associated with the white image;

the reference index number including a logical function OR is mapped to a conversion index number that replaces OR with AND;

the reference index number including a logical function AND is mapped to a conversion index number that replaces OR with AND; and

the reference index number including a logical function of XOR is mapped to a conversion index number that inverts the XOR logical function.

10. The system according to claim 9 where the reference index number is mapped to the conversion index number according to the additional following mapping rules:

the reference index number including a single operand is mapped to itself; and

the reference index number including a logical function of a single NOT is mapped to itself.

11. The system according to claim 7 where the first color space is a red, green, blue (RGB) color space, and the second color space is a cyan, magenta, yellow (CMY) color space.

12. The system according to claim 7 where performing the first logical operation on the one or more RGB operands in the first color space provides a same raster image operation result as performing the second logical operation on the one or more operands in the second color space.

13. A method for selecting a raster image operation comprising:

selecting a reference index number corresponding to a first logical operation associated with a first set of operands;

mapping the reference index number to a conversion index number, where the conversion index number corresponds to a second logical operation different than the first logical operation; and

operating on a second set of operands according to the second logical operation, the first set of operands being associated with a first color space, and the second set of operands being associated with a second color space

14. The method according to claim 13 where the second set of operands are identified by color components cyan, magenta, yellow, and black (CMYK).

15. The method according to claim 14 further comprising:

recovering the CMY components from K; and

zeroing out the K component prior to operating on the second set of operands.

16. The method according to claim 15 including generating the K component in a post under color removal operation after operating on the second set of operands.

17. The method according to claim 13 where performing the first logical operation on the first set of operands in the first color space provides a same raster image operation result as performing the second logical operation on the second set of operands in the second color space.

18. The method according to claim 13 where the reference index number is mapped to the conversion index number according to the following mapping rule:

the logical operation of the second set of operands associated with the conversion index number is equivalent to an inverse of a raster logical operation performed on the first set of operands, where the raster logical operation is associated with the reference index number.

19. The method according to claim 13 where the reference index number is mapped to the conversion index number according to the following mapping rules:

the reference index number associated with a white image maps to the conversion index number associated with a black image;

the reference index number associated with the black image maps to the conversion index number associated with the white image;

the reference index number including a logical function OR is mapped to a conversion index number that replaces OR with AND;

the reference index number including a logical function AND is mapped to a conversion index number that replaces OR with AND; and

the reference index number including a logical function of XOR is mapped to a conversion index number that inverts the XOR logical function.

20. The method according to claim where the reference index number is mapped to the conversion index number according to the additional following mapping rules:

the reference index number including a single operand is mapped to itself; and

the reference index number including a logical function of a single NOT is mapped to itself.