Information processing apparatus, information recording medium, image processing method, and program for converting a color space of an image

A non-transitory recording medium configured to store a program executable by a computer and first image data of a first image, first color space information indicating a first color space of the first image, and second image data of a second image;

• and
• wherein the program comprises:
• causing a reproduction device configured to generate a display image including the first image and the second image having a converted color space, to convert a second color space of the second image to the converted color space same as the first color space, when the second color space has a second color area different from a first color area of the first color space,
• in which the second color space of the second image is converted to the converted color space same as the first color space by
• generating a look up table that associates a palette entry identifier of a palette corresponding to the second color space of the second image with an image signal of the first color space of the first image, in which the look up table is generated from a second look up table having correspondence data between a second palette entry identifier corresponding to the second color space and a second image signal in the second color space by performing a color space conversion on the second look up table whereby the look up table has a color area that is different from a color area of the second look up table, the color space conversion on the second look up table comprising, for each of a plurality of second color space values in the second color space, rewriting the second color space value as a first color space value, and associating with the first color space value the second palette entry identifier provided in the second look up table for the second color space value, so as to generate the look up table comprising a plurality of first color space values associated with respective second palette entry identifiers, and
• converting a palette entry identifier of the second image directly to an image signal for superposition having the same color area as the first color space of the first image by using the look up table.

An image processing method comprising:

• receiving a first image, a second image and first color space information indicating a first color space of the first image;
• converting a second color space of the second image to a converted color space same as the first color space, when the second color space is different from the first color space;
• generating a display image including the first image and the second image having the converted color space;
• generating a look up table that associates a palette entry identifier of a palette corresponding to the second color space of the second image with an image signal of the first color space of the first image, in which the first color space of the first image has a first color area and the second color space of the second image has a second color area different from the first color area, and in which the look up table is generated from a second look up table having correspondence data between a second palette entry identifier corresponding to the second color space and a second image signal in the second color space by performing a color space conversion on the second look up table whereby the look up table has a color area that is different from a color area of the second look up table, the color space conversion on the second look up table comprising, for each of a plurality of second color space values in the second color space, rewriting the second color space value as a first color space value, and associating with the first color space value the second palette entry identifier provided in the second look up table for the second color space value, so as to generate the look up table comprising a plurality of first color space values associated with respective second palette entry identifiers;
• and
• converting a palette entry identifier of the second image directly to an image signal for superposition having the same color area as the first color space of the first image by using the look up table.

A non-transitory recording medium on which is recorded a program having instructions that, when executed by circuitry, configure the circuitry to:

• receive a first image, a second image and first color space information indicating a first color space of the first image;
• convert a second color space of the second image to a converted color space same as the first color space, when the second color space is different from the first color space;
• generate a display image including the first image and the second image having the converted color space;
• generate a look up table that associates a palette entry identifier of a palette corresponding to the second color space of the second image with an image signal of the first color space of the first image, in which the first color space of the first image has a first color area and the second color space of the second image has a second color area different from the first color area, and in which the look up table is generated from a second look up table having correspondence data between a second palette entry identifier corresponding to the second color space and a second image signal in the second color space by performing a color space conversion on the second look up table whereby the look up table has a color area that is different from a color area of the second look up table, the color space conversion on the second look up table comprising, for each of a plurality of second color space values in the second color space, rewriting the second color space value as a first color space value, and associating with the first color space value the second palette entry identifier provided in the second look up table for the second color space value, so as to generate the look up table comprising a plurality of first color space values associated with respective second palette entry identifiers;
• and
• convert a palette entry identifier of the second image directly to an image signal for superposition having the same color area as the first color space of the first image by using the look up table.