CN100450144C - Color managing method for pixel capable of transforming different color domain - Google Patents
Color managing method for pixel capable of transforming different color domain Download PDFInfo
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- CN100450144C CN100450144C CNB2005100789348A CN200510078934A CN100450144C CN 100450144 C CN100450144 C CN 100450144C CN B2005100789348 A CNB2005100789348 A CN B2005100789348A CN 200510078934 A CN200510078934 A CN 200510078934A CN 100450144 C CN100450144 C CN 100450144C
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Abstract
The present invention aims at looking for multiple weighing values of an intermediary color domain by pigment displayed by a device of different color spaces. The color coordinate transformation is carried out in the devices of different color spaces, so that the display pixels of different devices have the same chromatic characteristic, and the color communication among the device is obtained.
Description
Technical field
The present invention relates to a kind of method of color management, particularly a kind of method of color management of striding equipment.
Background technology
Image processing system comprises an image-input device usually, an image output device, and a color management module (color management module, CMM).On behalf of the data of an image, image-input device will export color management module to, color management module is handled received data, and the data after will handling reach image output device, the last image that produces near original image on image output device.Image-input device can comprise optical scanner, digital camera and digital camera etc., image output device can comprise various printer, draught machine or display etc., color management module can be general purpose computer, comes control peripheral devices and carries out signal processing by the software and hardware that is installed on it.
Different image devices can adopt different colour models, colour model is the color space of a solid, all colors of representing human eye to see, colour model commonly used can be divided into two big classes, are respectively rgb color (red, green, blue) and cmyk color (green grass or young crops, fuchsin, Huang, black).TV or computer display generally adopt the rgb color model, comply with the color space that different ratios is formed by red green blue tricolor, and printer or printing equipment generally adopt cmyk color.From outside watch, often represent these color spaces with various solid shape such as cube, cone or polygonal body.Colour gamut (color gamut) is then represented the scope of whole colors that an image device can show.The color space of image device roughly can be divided into two major types: equipment subordinate color (Device Dependent Color) and equipment individual color (Device Independent Color).Because every kind of image device all has its chromatic characteristic, even also can be different with a kind of color space of its video picture colour gamut of image device of label, aforesaid rgb color and cmyk color all belong to equipment subordinate color.And device-independent color space (as CIEXYZ, CIExyz, CIELAB, CIELUV etc.) is to belong to the color coordinate system that international color standard committee (CIE) is formulated, and its image color data can't change the hue coordinate data because equipment is different.
Because the image that different device produces might not have identical chrominance signal, even adopt the device of same color space, often because the characteristic of equipment subordinate color makes same hue coordinate can show different chromatic characteristics on different device.Therefore, image processing system need be carried out the work of color management by color management module, makes distinct device can correctly express the view data of tool same hue characteristic, links up and match colors with the color of conveniently striding between the medium.
Summary of the invention
The invention provides a kind of method of color management, link up and match colors so that the color of striding between the medium to be provided.
The present invention is the method that discloses a kind of color management, it comprises the following step: the hue coordinate of (a) obtaining the pixel of display unit generation, (b) seek in a plurality of hue coordinates of intermediary's colour gamut hue coordinate near the hue coordinate of this pixel, (c) a plurality of intermediaries hue coordinate of the hue coordinate that is found according to obtained hue coordinate of step (a) and step (b) produces a plurality of weights, (d) produce in a plurality of hue coordinates of a printing equipment a plurality of hue coordinates corresponding to this a plurality of intermediaries hue coordinate, (e) a plurality of hue coordinates that produce according to these a plurality of weights and step (d) produce a color coordinate, and the hue coordinate that (f) produces according to step (e) is printed this pixel.
The present invention discloses a kind of method of color management in addition, it comprises the following step: the hue coordinate of (a) obtaining the pixel of printing equipment generation, (b) seek in a plurality of hue coordinates of intermediary's colour gamut hue coordinate near the hue coordinate of this pixel, (c) a plurality of intermediaries hue coordinate of the hue coordinate that is found according to obtained hue coordinate of step (a) and step (b) produces a plurality of weights, (d) produce in a plurality of hue coordinates of a display unit a plurality of hue coordinates corresponding to this a plurality of intermediaries hue coordinate, (e) a plurality of hue coordinates that produce according to these a plurality of weights and step (d) produce a color coordinate, and the hue coordinate that (f) produces according to step (e) shows this pixel.
Description of drawings
Fig. 1 is the schematic diagram of the color space of a display unit.
Fig. 2 is the schematic diagram of intermediary's colour gamut.
Fig. 3 is the schematic diagram of the thin bilge construction of the three-dimensional interpolation table of intermediary's colour gamut of a display unit.
Fig. 4 to Fig. 9 is the schematic diagram of a sub-intermediary colour gamut of Fig. 3 intermediary colour gamut.
Figure 10 is the schematic diagram of the thin bilge construction of the three-dimensional interpolation table of intermediary's colour gamut of a printing equipment.
Figure 11 to Figure 16 is the schematic diagram of a sub-intermediary colour gamut of Figure 10 intermediary colour gamut.
The reference numeral explanation
10: color space
20,30,100: the three-dimensional interpolation table of intermediary's colour gamut
PQ1-pQ8, dQ1-dQ8: sub-intermediary colour gamut
PT1-pT6, dT1-dT6: tetrahedron
PP1-pP8, dP1-dP8: summit
PV1-pV4, dV1-dV4: vector
Embodiment
Suppose that a display unit adopts the rgb color space of equipment subordinate color, with R, G, the B three-dimensional is expressed the colour component of a pixel; One intermediary's colour gamut (for example sRGB color space) then adopts R ", G ", B " and three-dimensional expresses the colour component of a pixel; One printing equipment adopts the rgb color space of equipment subordinate color equally, with R ', and G ', B ' three-dimensional is expressed the colour component of a pixel.Because rgb color space belongs to equipment subordinate color, same hue coordinate can manifest different chromatic characteristics on display unit and printing equipment, therefore color management module need carry out the conversion of hue coordinate, according to desiring the hue coordinate of print pixel on the color space of display unit, on the color space of printing equipment, produce a corresponding hue coordinate, make printing equipment to print the pixel of providing the same hue characteristic according to this corresponding hue coordinate.
Please refer to Fig. 1, the color space 10 that on behalf of a display unit, Fig. 1 adopted.The one pre-coordinate of pixel P on color space 10 of printing be (R, G, B), coordinate (R, G, B) represent pixel P red (R) on color space 10, green (G), and the composition of blueness (B) three looks.Please refer to Fig. 2, the three-dimensional interpolation table 20 of intermediary's colour gamut that on behalf of the present invention, Fig. 2 set up by color space 10.The three-dimensional interpolation table 20 of intermediary's colour gamut is to set up by colourity measurement process, and its structure and color space 10 are similar, and difference is that the three-dimensional interpolation table 20 of intermediary's colour gamut comprises a plurality of reference coordinates, is represented by the round dot among the figure.If color space 10 belongs to equipment subordinate color, then the three-dimensional interpolation table of intermediary's colour gamut of being tried to achieve by the different device that adopts color space 10 can comprise different a plurality of reference coordinates.For example, if the same color space 10 that belongs to equipment subordinate color that adopts of a display unit and a printing equipment, it is identical to measure the resultant three-dimensional interpolation table structure of intermediary's colour gamut that is relevant to display unit and printing equipment by colourity, but a plurality of different reference coordinate that it respectively comprises.
The present invention is converted to the hue coordinate of a pixel color space of one printing equipment from the color space of a display unit.At first (R, G B) correspond to intermediary's colour gamut (for example sRGB color space), and its hue coordinate is by (iR, iG, iB) expression at the hue coordinate of color space 10 with pixel P.According to hue coordinate (iR, iG, iB), in the three-dimensional interpolation table of the intermediary colour gamut of display unit, seek out near hue coordinate (iR, iG, reference coordinate iB) (R ", G ", B ").
At first the explanation how to try to achieve hue coordinate (iR, iG, iB).Please refer to Fig. 3 to Fig. 9, Fig. 3 represents the thin bilge construction of the three-dimensional interpolation table 30 of intermediary's colour gamut of a display unit.Three-dimensional interpolation table 30 comprise with hue coordinate (Rr ", Gr ", Br ") be 8 colour gamut dQ1-dQ8 of the sub-intermediary of display unit at center, Fig. 4 to Fig. 9 illustrates the structure of the sub-colour gamut dQ1 of intermediary.The sub-colour gamut dQ1 of intermediary is made up of 6 tetrahedron dT1-dT6, and is extremely shown in Figure 9 as Fig. 4 respectively.Hue coordinate (iR, iG iB) have following state:
(1) G＞B＞R: (iR, iG iB) correspond in the interior tetrahedron dT1 of the sub-colour gamut dQ1 of intermediary hue coordinate;
(2) G＞R＞B: (iR, iG iB) correspond in the interior tetrahedron dT2 of the sub-colour gamut dQ1 of intermediary hue coordinate;
(3) R＞G＞B: (iR, iG iB) correspond in the interior tetrahedron dT3 of the sub-colour gamut dQ1 of intermediary hue coordinate;
(4) B＞G＞R: (iR, iG iB) correspond in the interior tetrahedron dT4 of the sub-colour gamut dQ1 of intermediary hue coordinate;
(5) B＞R＞G: (iR, iG iB) correspond in the interior tetrahedron dT5 of the sub-colour gamut dQ1 of intermediary hue coordinate;
(6) R＞B＞G: (iR, iG iB) correspond in the interior tetrahedron dT6 of the sub-colour gamut dQ1 of intermediary hue coordinate.
Please refer to Fig. 4, suppose hue coordinate (R, the G of pixel P on the color space 10 of display unit, B) drop in the interior tetrahedron dT1 of the sub-colour gamut dQ1 of intermediary hue coordinate (iR, iG, iB) can be by the vectorial dV1 of 4 summit dP1-dP4 representatives of tetrahedron dT1, dV2, dV3 and dV4 represent.Vector dV1, dV2, dV3 and dV4 be respectively by summit dP1 and dP2, summit dP2 and dP3, summit dP3 and dP4, and summit dP1 and dP4 define, and comprises RGB composition of all kinds in the tetrahedron dT1.The hue coordinate of pixel P (R, G, B) correspond to the three-dimensional interpolation table 30 of intermediary colour gamut hue coordinate (iR, iG, iB) and vectorial dV1-dV4 following relationship is arranged:
iR＝w1*R1”+w2*R2”+w3*R3”+w4*R4”
iG＝w1*G1”+w2*G2”+w3*G3”+w4*G4”
iB＝w1*B1”+w2*B2”+w3*B3”+w4*B4”
Wherein,
R1 "-R4 " proportion of vectorial dV1-dV4 red composition in the three-dimensional interpolation table 30 of display unit intermediary colour gamut of representing tetrahedron dT1 respectively;
G1 "-G4 " represent tetrahedron dT1 respectively vectorial dV1-dV4 at the proportion of the three-dimensional interpolation table 30 medium green colour contents of display unit intermediary colour gamut; And
B1 "-B4 " represent tetrahedron dT1 respectively vectorial dV1-dV4 at the proportion of the three-dimensional interpolation table 30 Smalt compositions of display unit intermediary colour gamut;
Wherein,
W1-w4 represents hue coordinate (iR, iG, the weights when iB) representing with vectorial dV1, dV2, dV3 and dV4, and w1+w2+w3+w4=1 respectively.
The present invention is according to the hue coordinate (R of pixel P on color space 10, G, B), with above-mentioned method, obtain corresponding to the hue coordinate (iR of intermediary's colour gamut, iG iB), seeks in a plurality of hue coordinates of the three-dimensional interpolation table 30 of printing equipment intermediary colour gamut near hue coordinate (iR, iG, hue coordinate iB) (R ", G ", B ").Please refer to Figure 10, Figure 10 represents the thin bilge construction of the three-dimensional interpolation table 100 of intermediary's colour gamut of a printing equipment.Comprise in the three-dimensional interpolation table 100 of printing equipment intermediary colour gamut with hue coordinate (R "; G "; B ") be 8 sub-colour gamut pQ1-pQ8 of intermediary at center, each sub-intermediary colour gamut is made up of 6 tetrahedron pT1-pT6, defined by wherein 4 summits among 8 summit pP1-pP4 of each sub-intermediary colour gamut of definition, the structure of tetrahedron pT1-pT6 such as Figure 11 are to shown in Figure 16.The present invention with the hue coordinate of printing equipment intermediary colour gamut 100 (R ", G ", B ") for searching starting point, obtain a plurality of weights α 1-α 4 with the method for trial and error, make hue coordinate (iR, iG, iB) can be by following formulate:
iR＝α1*R1”+α2*R2”+α3*R3”+α4*R4”
iG＝α1*G1”+α2*G2”+α3*G3”+α4*G4”
iB＝α1*B1”+α2*B2”+α3*B3”+α4*B4”
Wherein,
R1 "-R4 " proportion of vectorial pV1-pV4 red composition in the three-dimensional interpolation table 100 of printing equipment intermediary colour gamut of representing tetrahedron pT1 respectively;
G1 "-G4 " represent tetrahedron pT1 respectively vectorial pV1-pV4 at the proportion of the three-dimensional interpolation table 100 medium green colour contents of printing equipment intermediary colour gamut;
B1 "-B4 " represent tetrahedron pT1 respectively vectorial pV1-pV4 at the proportion of the three-dimensional interpolation table 100 Smalt compositions of printing equipment intermediary colour gamut; And
α 1-α 4 represent respectively hue coordinate (iR, iG, iB) with vectorial pV1, pV2, the weights when pV3 and pV4 represent, and α 1+ α 2+ α 3+ α 4=1.
At R1 "-R4 ", G1 "-G4 " and B1 "-B4 ", corresponding numerical value is R1 '-R4 ' on the color space of a printing equipment, G1 '-G4 ' and B1 '-B4 ', together with the weights α 1-α 4 that previous steps produced, can produce the object color component coordinate (R ', G ', B ') of pixel P at the color space of printing equipment.Object color component coordinate (R ', G ', B ') represent pixel P on the color space 10 of display unit hue coordinate (R, G B) correspond to hue coordinate on the color space of printing equipment, can be by following formulate:
R’＝α1*R1’+α2*R2’+α3*R3’+α4*R4’
G’＝α1*G1’+α2*G2’+α3*G3’+α4*G4’
B’＝α1*B1’+α2*B2’+α3*B3’+α4*B4’
Wherein, α 1+ α 2+ α 3+ α 4=1
On the color space of printing equipment, produce corresponding hue coordinate at last, together with the weights α 1-α 4 that previous steps produced, can produce object color component coordinate on pixel P corresponds to printing equipment from the color space 10 of display unit the color space (R ', G ', B ').
Fig. 3 and the three-dimensional interpolation table 30 and 100 of intermediary shown in Figure 10 colour gamut be the sRGB color space, and the present invention also can adopt other color space to be used as intermediary's colour gamut three-dimensional interpolation table 30 and 100, RGB for example, Photo YCC, color spaces such as Adobe RGB.
In addition, the present invention also can be converted to the hue coordinate of a pixel color space of one display unit from the color space of a printing equipment.At the hue coordinate of pixel P ' on the color space of a printing equipment (Rr ', Gr ', Br '), the present invention with hue coordinate (Rr ', Gr ', Br ') with aforesaid method correspond to the three-dimensional interpolation table 100 of printing equipment intermediary colour gamut with obtain corresponding hue coordinate (iRr ', iGr ', iBr '), seek again in a plurality of hue coordinates of the three-dimensional interpolation table 30 of display unit intermediary colour gamut hue coordinate near hue coordinate (iRr ', iGr ', iBr ') (Rr "; Gr ", Br ").
As shown in Figure 3, comprise in the three-dimensional interpolation table 30 of display unit intermediary colour gamut with hue coordinate (Rr "; Gr ", Br ") be 8 sub-colour gamut dQ1-dQ8 of intermediary at center; and each sub-intermediary colour gamut is made up of 6 tetrahedron dT1-dT6, is defined by wherein 4 summits among 8 summit dP1-dP4 of each sub-intermediary colour gamut of definition.The present invention with hue coordinate (Rr ", Gr ", Br ") be the search starting point in the display unit intermediary colour gamut; with the mode of trial and error judge hue coordinate (Rr ', Gr ', Br ') correspond to the hue coordinate of the three-dimensional interpolation table 30 of intermediary's colour gamut (iRr '; iGr ', iBr ') the position.Suppose that hue coordinate (iRr ', iGr ', iBr ') is positioned at the tetrahedron dT1 of the sub-colour gamut dQ1 of intermediary, hue coordinate (iRr ', iGr ', iBr ') can be by the vectorial dV1 of 4 summit dP1-dP4 representatives of tetrahedron dT1, dV2, and dV3 and dV4 represent.Vector dV1, dV2, dV3 and dV4 be respectively by summit dP1 and dP2, summit dP2 and dP3, summit dP3 and dP4, and summit dP1 and dP4 define, and comprises RGB composition of all kinds in the tetrahedron dT1.The present invention obtains a plurality of weights α 1-α 4 with the method for trial and error, makes that hue coordinate (iRr ', iGr ', iBr ') can be by following formulate:
iRr’＝1*R1”+2*R2”+3*R3”+4*R4”
iGr’＝1*G1”+2*G2”+3*G3”+4*G4”
iBr’＝1*B1”+2*B2”+3*B3”+4*B4”
Wherein,
R1 "-R4 " proportion of vectorial dV1-dV4 red composition in the three-dimensional interpolation table 30 of display unit intermediary colour gamut of representing tetrahedron dT1 respectively;
G1 "-G4 " represent tetrahedron dT1 respectively vectorial dV1-dV4 at the proportion of the three-dimensional interpolation table 30 medium green colour contents of display unit intermediary colour gamut; And
B1 "-B4 " represent tetrahedron dT1 respectively vectorial dV1-dV4 at the proportion of the three-dimensional interpolation table 30 Smalt compositions of display unit intermediary colour gamut;
Wherein,
1-4 represents hue coordinate (iRr ', iGr ', iBr ') with vectorial dV1 respectively, dV2, the weights when dV3 and dV4 represent, and 1+2+3+4=1.
At R1 "-R4 ", G1 "-G4 " and B1 "-B4 " the corresponding R1-R4 of generation on the color space of a display unit, G1-G4 and B1-B4, together with the weights 1-4 that previous steps produced, the color space of display unit can produce pixel P ' the object color component coordinate (Rr, Gr, Br).The object color component coordinate (Rr, Gr, Br) represent pixel P ' in the color space of printing equipment hue coordinate (R, G B) correspond to hue coordinate on the color space of display unit, can be by following formulate:
Rr＝1*R1+2*R2+3*R3+4*R4
Gr＝1*G1+2*G2+3*G3+4*G4
Br＝1*B1+2*B2+3*B3+4*B4
Wherein, 1+2+3+4=1
Object color component coordinate (the Rr that the present invention tried to achieve, Gr, Br) be pixel P ' and correspond to hue coordinate on the color space of display unit from the color space of printing equipment, display unit can be according to object color component coordinate (Rr, Gr, Br) display pixel P ', the chromatic characteristic that obtains image can meet the chromatic characteristic of pixel P ' on the printing equipment.
In sum, the invention provides a kind of method of color management, by a plurality of weights of seeking intermediary's colour gamut, carry out color coordinate conversion at the equipment room that adopts the different color space, make distinct device can correctly express the view data of tool same hue characteristic, link up and match colors to reach the color of striding between the medium.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (8)
1. the color management method of the pixel of convertible different colour gamuts, it comprises the following step:
(a) obtain the hue coordinate of the pixel that a display unit produces;
(b) seek in a plurality of hue coordinates of intermediary's colour gamut hue coordinate near the hue coordinate of this pixel;
(c) a plurality of intermediaries hue coordinate of the hue coordinate that is found according to obtained hue coordinate of step (a) and step (b) produces a plurality of weights;
(d) produce in a plurality of hue coordinates of a printing equipment a plurality of hue coordinates corresponding to this a plurality of intermediaries hue coordinate;
(e) a plurality of hue coordinates that produce according to these a plurality of weights and step (d) produce a color coordinate; And
(f) hue coordinate that produces according to step (e) is printed this pixel.
2. the method for claim 1, its comprise in addition occur in step (b) and (c) between step (g): a plurality of intermediaries hue coordinate of seeking the hue coordinate that step (b) found.
3. method as claimed in claim 3, wherein, step (g) is to seek a plurality of intermediaries hue coordinate of the hue coordinate that step (b) found in the mode of trial and error.
4. method as claimed in claim 2, wherein, step (g) is to seek 4 intermediary's hue coordinates of the hue coordinate that step (b) found.
5. the color management method of the pixel of convertible different colour gamuts, it comprises the following step:
(a) obtain the hue coordinate of the pixel that a printing equipment produces;
(b) seek in a plurality of hue coordinates of intermediary's colour gamut hue coordinate near the hue coordinate of this pixel;
(c) a plurality of intermediaries hue coordinate of the hue coordinate that is found according to obtained hue coordinate of step (a) and step (b) produces a plurality of weights;
(d) produce in a plurality of hue coordinates of a display unit a plurality of hue coordinates corresponding to this a plurality of intermediaries hue coordinate;
(e) a plurality of hue coordinates that produce according to these a plurality of weights and step (d) produce a color coordinate; And
(f) hue coordinate that produces according to step (e) shows this pixel.
6. method as claimed in claim 5, its comprise in addition occur in step (b) and (c) between step (g): a plurality of intermediaries hue coordinate of seeking the hue coordinate that step (b) found.
7. method as claimed in claim 6, wherein, step (g) is to seek a plurality of intermediaries hue coordinate of the hue coordinate that step (b) found in the mode of trial and error.
8. method as claimed in claim 6, wherein, step (g) is to seek 4 intermediary's hue coordinates of the hue coordinate that step (b) found.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1122485A (en) * | 1994-11-01 | 1996-05-15 | 联华电子股份有限公司 | Image synthesis method and apparatus with picture element as processing unit |
| CN1160326A (en) * | 1995-12-30 | 1997-09-24 | 三星电子株式会社 | Color processing method and apparatus thereof using two-dimensional chromaticity separation |
| WO2003101084A1 (en) * | 2002-05-23 | 2003-12-04 | Nec Corporation | Color conversion method and color conversion device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1122485A (en) * | 1994-11-01 | 1996-05-15 | 联华电子股份有限公司 | Image synthesis method and apparatus with picture element as processing unit |
| CN1160326A (en) * | 1995-12-30 | 1997-09-24 | 三星电子株式会社 | Color processing method and apparatus thereof using two-dimensional chromaticity separation |
| WO2003101084A1 (en) * | 2002-05-23 | 2003-12-04 | Nec Corporation | Color conversion method and color conversion device |
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