CN101436295B - Method and apparatus for processing color separation of image file - Google Patents
Method and apparatus for processing color separation of image file Download PDFInfo
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- CN101436295B CN101436295B CN2008102272560A CN200810227256A CN101436295B CN 101436295 B CN101436295 B CN 101436295B CN 2008102272560 A CN2008102272560 A CN 2008102272560A CN 200810227256 A CN200810227256 A CN 200810227256A CN 101436295 B CN101436295 B CN 101436295B
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Abstract
The invention discloses a color separation processing method and a color separation processing device for an image file. The method comprises the following steps: the image file is analyzed to obtain image data; the image data is subject to color separation processing according to a color mode needed by color separation to obtain image data corresponding to different colors; and the image data corresponding to the colors is written into corresponding color plates respectively, and a PS file is generated according to the color plates. The adoption of the method can reduce the data amount of the PS file, improve the speed of analysis and processing of the PS file, and improve the utilization rate of storage space of storage medium.
Description
Technical field
The present invention relates to the computer composition field, relate in particular to a kind of color separation processing method and device of view data.
Background technology
In the publication and printing field, because a variety of causes often need carry out the front end color separation in software for composing.For example,, colored original is decomposed into each autotype, thereby original copy is converted into the version compatible mutually with the colored printing process for the needs of colored printing.
Usually adopt the four-color process method in the printing, therefore, earlier original copy is carried out look and decompose, be divided into green grass or young crops (C), pinkish red (M), yellow (Y), black (K) four look look versions, carry out the synthetic of look when printing then again.Because the development of printing technology; At present can through scanning device before printing with the color separation of original copy color, take a sample and change into digital information; That is, the original copy color is decomposed into red (R), green (G), blue (B) three looks, the digitized of going forward side by side; Be decomposed into green grass or young crops (C), pinkish red (M), yellow (Y), black (K) four look information to numerical information with computer equipment through mathematical computations again, form PS (PostScript) file.
During front end color separation output PS file, often need comprise view data.In the prior art, each look version all comprises all images data, and the file data amount is very big, has both reduced the disk space utilization factor, has reduced the resolution speed of file again.
Summary of the invention
The embodiment of the invention provides a kind of color separation processing method and device of image file, in order to solve big, the slow-footed problem of document analysis of conventional images data color separation processing process file data volume.
The color separation processing method of the image file that the embodiment of the invention provides is applied to the publication and printing field, comprising:
Resolve image file, obtain view data;
The color mode required according to color separation carries out color separation processing to said view data; Obtain the corresponding view data of different colours; Said said view data is carried out color separation processing; Be specially: the color mode of the view data that obtains according to parsing directly obtains or obtains through mode switch the multichannel image data of the required color mode of color separation;
The view data that each color is corresponding writes corresponding look version respectively, and generates the PS file according to version of all kinds; Wherein, the view data that each color is corresponding writes corresponding look version respectively, is specially: each channel image data is write the look version corresponding with passage respectively.
The device of the image file color separation processing that the embodiment of the invention provides is applied to the publication and printing field, comprising:
The document analysis module is used to resolve image file, obtains view data;
The image color segmentation module is used for according to the required color mode of color separation said view data being carried out color separation processing, obtains the corresponding view data of different colours; Be further used for, the color mode of the view data that obtains according to parsing directly obtains or obtains through mode switch the multichannel image data of the required color mode of color separation;
File generating module is used for the view data that each color is corresponding and writes corresponding look version respectively, and generates the PS file according to version of all kinds; Said file generating module is further used for, and each channel image data is write the look version corresponding with passage respectively.
The above embodiment of the present invention; Through image file is resolved and color separation processing, obtain the corresponding view data of different colours in the required color mode of color separation, again that each color is corresponding view data writes corresponding look version respectively; Generate the PS file; Version of all kinds only comprises the view data corresponding with this look version in the PS file thereby make, and compares with in of all kinds edition of the PS file of the prior art all images data all being comprised wherein, has reduced the data volume of PS file; And then improved parsing, the processing speed of PS file, and further improved the operating factor of memory space of storage medium.
Description of drawings
The schematic flow sheet of the image file color separation processing that Fig. 1 provides for the embodiment of the invention;
The structural representation of the device of the image file color separation processing that Fig. 2 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Referring to Fig. 1, the schematic flow sheet of the image file color separation processing that provides for the embodiment of the invention.For the needs of colored printing, the required color mode of front end color separation is the CMYK pattern usually, but does not also get rid of the possibility of other color modes, but its handling principle is the same.Be that CMYK is that example is described with the required color mode of front end color separation below, this flow process specifically comprises:
In this step; Can judge the form of image file according to the filename suffix of image file; As judging that for the image file of file image.GIF by name it is a tiff format; In order to improve the accuracy of judgement, also can judge through the field of relevant document form in the file header of reading images file.For color mode, can judge through the field that reads relevant color mode in the file header.For type, can through reading in the file header relevant whether compress and the field of compress mode is judged.
The relevant information that step 102, basis extract from image file is resolved image file, thereby gets access to view data.
In this step, when resolving the image file process, coded system and the compression that can determine view data according to the form and the type of the image file that extracts parse view data with decoding mode corresponding and decompress(ion) mode then.The color mode of image file has determined the quantity and the type of passage, and the view data that parses can be organized with the pairing hyperchannel form of color mode.For example:
For file layout is that TIFF, color mode are the picture that RGB, view data do not have compression, resolve this image file after, the reads image data content obtains RGB_R, RGB_G, three channel image data of RGB_B.
The color mode of the image file that step 103, basis extract determines whether to carry out mode switch, and if desired, then execution in step 104, otherwise execution in step 105.
In this step; Because when color mode is binary map, artwork master, key map, gray-scale map or CMYK isotype; The view data of its hyperchannel form can be directly corresponding with the multi-channel data of the required CMYK pattern of color separation; Therefore, for the view data of above-mentioned color mode, then need not carry out mode switch.Because color mode is when being the RGB pattern, the view data of its hyperchannel form is can not be directly directly corresponding with the multi-channel data of the required CMYK pattern of color separation, therefore, need the view data of RGB pattern be converted into the required CMYK pattern of color separation.
For the image file of RGB pattern, after the mode switch processing, obtain the view data of CMYK pattern, comprise CMYK_C, CMYK_M, CMYK_Y and four channel image data of CMYK_K.
The corresponding image channel of look version that whether has and select in the view data that obtains is resolved in step 106, judgement, if having, then execution in step 107, otherwise execution in step 109.
In this step; Because the number of channels of the view data that goes out from the Image File Parser of some color mode is less than the number of channels of CMYK pattern; Like binary map, artwork master, gray-scale map etc., not necessarily exist and the corresponding data channel of selecting of look version for these image files.
The PS instruction is before writing view data in the sensing PS file; Need describe the color space of view data, picture size, picture position, transformation matrix, picture data type, code encoding/decoding mode etc., also will write Flame Image Process instruction (like orders such as the image) PS of etc.ing simultaneously and instruct.PS file for color separation output; In this step, write above-mentioned these whens instruction, owing to only comprise the view data of respective channel in the version of all kinds, thereby the PS instruction when being different from prior art output PS file; Need adjust instruction, may use different parameters or different instructions.
In the above-mentioned flow process; Can travel through each look version in the CMYK look version successively; Thereby in C look version, write the CMYK_C channel image data that parses, in M look version, write the CMYK_M channel image data that parses, in Y look version, write the CMYK_Y channel image data that parses; In K look version, write the CMYK_K channel image data that parses, finally form the PS file.Certainly, under the non-existent situation of certain channel image data, need not write view data in the corresponding look version.
Can find out through above-mentioned flow process, adopt the PS file of above-mentioned color separation output, promptly; Through resolving image file; The different channel image data correspondences that parse are write in four look versions of the required CMYK pattern of front end color separation, and finally form the PS file, thereby make of all kinds edition view data that only comprises respective channel in the PS file; And in the PS file that employing prior art mode is exported; Version of all kinds all comprises whole view data, and is visible, and the method that adopts the embodiment of the invention to provide can significantly reduce the data volume of PS file; And can further improve parsing, processing speed, and the operating factor of memory space that improves storage medium (like disk) to the PS file.To same color document image, after table 1 has provided respectively and has adopted prior art mode and the mode that adopts the embodiment of the invention to provide to handle, the comparison in file size and shared space:
Table 1
| ? | The PS file size | The PS file takes up room |
| The prior art mode | (4.46MB 4,682,253 byte) | (4.46MB 4,685,824 byte) |
| The mode of the embodiment of the invention | (1.70MB 1,784,205 byte) | (1.70MB 1,785,856 byte) |
Based on identical technical conceive, the embodiment of the invention also provides a kind of image file color separation processing device.
Referring to Fig. 2, the structural representation of the image file color separation processing device that provides for the embodiment of the invention, this device comprises: document analysis module 21, image color segmentation module 22 and file generating module 23, wherein:
Image color segmentation module 22 is used for according to the required color mode of color separation document analysis module 21 being resolved the view data that obtains and carries out color separation processing, obtains the corresponding view data of different colours;
In said apparatus; Document analysis module 21 can be confirmed the number of channels and the type of this view data through the color mode of reading images file; And reading out the corresponding view data of each passage according to the file layout of this image file and compression type, concrete mode is as previously mentioned.Image color segmentation module 22 is before carrying out color separation processing; Can whether carry out mode switch according to the color mode decision of this view data; As when the required color mode of front end color separation is CMYK; Then the view data for the RGB pattern need be converted into the CMYK pattern, and the view data that when this module is carried out color separation processing, will parse (or after further passing through mode switch) converts the multichannel image data of the required color mode of color separation processing into.File generating module 23 can write each channel image data after image color segmentation module 22 color separation processing respectively the look version corresponding with passage; Thereby finally generate the PS file, for example can in version of all kinds, write the view data of respective channel through the mode of aforementioned traversal version of all kinds.
In sum; The embodiment of the invention is to the defective that exists in the prior art; A kind of color separation processing method and device of image file are provided; Can resolve image file according to the required color mode of front end color separation, be processed into multi-channel data to picture material, in each look version, only embed the view data of respective channel.Avoid view data repeated storage in the prior art thus, can obviously improve the disk space utilization factor and improve document analysis speed.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; Described program can be stored in the computer-readable recording medium; Described storage medium is like ROM/RAM, magnetic disc, CD etc.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be forgiven within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (6)
1. the color separation processing method of an image file is characterized in that, is applied to the publication and printing field, comprising:
Resolve image file, obtain view data;
The color mode required according to color separation carries out color separation processing to said view data; Obtain the corresponding view data of different colours; Said said view data is carried out color separation processing; Be specially: the color mode of the view data that obtains according to parsing directly obtains or obtains through mode switch the multichannel image data of the required color mode of color separation;
The view data that each color is corresponding writes corresponding look version respectively, and generates the PS file according to version of all kinds; Wherein, the view data that each color is corresponding writes corresponding look version respectively, is specially: each channel image data is write the look version corresponding with passage respectively.
2. the method for claim 1 is characterized in that, resolves image file and obtains view data, comprising:
Confirm the color mode of said image file, confirm the quantity and the type of passage, and read the corresponding view data of each passage according to this color mode.
3. method as claimed in claim 2 is characterized in that, resolves image file and obtains view data, also comprises:
Confirm the file layout of said image file, adopt the decoding process corresponding to read the corresponding view data of each passage with this document form; Or/and
Confirm the compress mode of said image file, adopt the decompress(ion) mode corresponding to read the corresponding view data of each passage with this compress mode.
4. the method for claim 1; It is characterized in that; If resolving the color mode of the view data obtain is binary map, artwork master, key map, gray-scale map or CMYK, each channel data corresponds to the multichannel image data of the required CMYK pattern of color separation in the view data that then parsing is obtained; Perhaps,
If resolving the color mode of the view data that obtains is RGB, then the RGB mode switch with this view data is the required CMYK pattern of color separation, obtains the multi-channel data of CMYK pattern.
5. the color separation processing device of an image file is characterized in that, is applied to the publication and printing field, comprising:
The document analysis module is used to resolve image file, obtains view data;
The image color segmentation module is used for according to the required color mode of color separation said view data being carried out color separation processing, obtains the corresponding view data of different colours; Be further used for, the color mode of the view data that obtains according to parsing directly obtains or obtains through mode switch the multichannel image data of the required color mode of color separation;
File generating module is used for the view data that each color is corresponding and writes corresponding look version respectively, and generates the PS file according to version of all kinds;
Said file generating module is further used for, and each channel image data is write the look version corresponding with passage respectively.
6. device as claimed in claim 5 is characterized in that, said document analysis module is further used for, and confirms the color mode of said image file, confirms the quantity and the type of passage according to this color mode, and reads the corresponding view data of each passage.
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| CN2008102272560A CN101436295B (en) | 2008-11-25 | 2008-11-25 | Method and apparatus for processing color separation of image file |
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| CN2008102272560A CN101436295B (en) | 2008-11-25 | 2008-11-25 | Method and apparatus for processing color separation of image file |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4402015A (en) * | 1980-01-21 | 1983-08-30 | Dainippon Screen Seizo Kabushiki Kaisha | Picture signal pre-processing method for a picture reproducing machine |
| US5640254A (en) * | 1995-02-06 | 1997-06-17 | Polygraphex Systems, Inc. | Method for applying FM screening to a digital image |
| CN1475860A (en) * | 2002-04-23 | 2004-02-18 | ��Τ����˹ | Colour dichromic method and its printed product |
| CN1499444A (en) * | 2002-11-05 | 2004-05-26 | �����е��ʽ���� | Reading and printing device of colour image |
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- 2008-11-25 CN CN2008102272560A patent/CN101436295B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4402015A (en) * | 1980-01-21 | 1983-08-30 | Dainippon Screen Seizo Kabushiki Kaisha | Picture signal pre-processing method for a picture reproducing machine |
| US5640254A (en) * | 1995-02-06 | 1997-06-17 | Polygraphex Systems, Inc. | Method for applying FM screening to a digital image |
| CN1475860A (en) * | 2002-04-23 | 2004-02-18 | ��Τ����˹ | Colour dichromic method and its printed product |
| CN1499444A (en) * | 2002-11-05 | 2004-05-26 | �����е��ʽ���� | Reading and printing device of colour image |
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