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Device and method of fabricating color conversion table and medium recording program for forming color conversion table
| Details |
Inventors: Fukasawa, Kenji; Kasahara, Hirokazu;
Assignee: Seiko Epson Corporation (Tokyo, JP)
Primary Examiner: Coles; Edward
Assistant Examiner: Pokrzywa; Joseph R.
Attorney, Agent or Firm: Sughrue Mion, PLLC
In order to optimize a color conversion table in accordance with environment of a user since a conventional color conversion table used in a printer driver is not optimized in accordance with the environment of the user, when an installer operation is executed by a computer 21 constituting an image processing device 20, a color conversion table 21b2b is formed from a pre conversion color conversion table 21b2c at step S130 and according to a processing of increasing lattice points in this case, the lattice points are increased by nonlinear interpolation calculation using Lagrange interpolation equation at step S430 or the lattice points are increased by linear interpolation, and in that case the number of the lattice points may be fixed or may be a number in accordance with environment or input image by which the color conversion table 21b2b having a pertinent size can be formed from the pre conversion color conversion table 21b2c having a small size. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a device and a method for fabricating a color conversion table, capable of forming a color conversion table optimized to a given environment, such as that of a user or the like.
It is also an object of the invention to provide a computer readable medium recording such a program for forming such an optimal color conversion table.
According to an aspect of the present invention, there is provided a device for fabricating a color conversion table in which a color conversion table corresponding grey scale color representing data in a post conversion color representing space to lattice points is formed in order to convert the grey scale color representing data between the different color representing spaces, the device including a pre conversion color conversion table for storing a corresponding relationship of conversion at a small number of lattice points and interpolating means for increasing the lattice points of the pre conversion color conversion table by an interpolation calculation and forming a color conversion table used in the conversion.
According to the present invention constituted as described-above, there is originally existed the pre conversion color conversion table having a small number of the lattice points, which requires little storage resource.
Further, the interpolating means forms the color conversion table by increasing the lattice points of the pre conversion color conversion table by interpolation calculation and utilizes the formed color conversion table in color conversion.
The number of the lattice points in the pre conversion color conversion table may be relatively small in comparison with those in the formed color conversion table and has not necessarily to be an extremely small numerical value.
Particularly, in the case of three-dimensional lattice points, the amount of lattice points is changed in a cubic ratio.
That is, when the number of points is halved, the size of the color conversion table is reduced to 1/8 of the original and accordingly, enormous effect is achieved to storage resource only with a small difference therebetween
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