CN103108104A - Method and system of changing color fading and trapping - Google Patents
Method and system of changing color fading and trapping Download PDFInfo
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- CN103108104A CN103108104A CN2011103516013A CN201110351601A CN103108104A CN 103108104 A CN103108104 A CN 103108104A CN 2011103516013 A CN2011103516013 A CN 2011103516013A CN 201110351601 A CN201110351601 A CN 201110351601A CN 103108104 A CN103108104 A CN 103108104A
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Abstract
The invention discloses a method and a system of changing color fading and trapping and relates to the technical field of fading and trapping in image processing. By the adoption of the method, a mixing color piece which needs changing color of fading and trapping in a photo to be waited fading and trapping is chosen, the mixing color piece and a hue of monochrome printing ink, saturation and brightness are extracted, and the mixing color piece is formed by the hue of the monochrome printing ink, the saturation and the brightness; then according the requirements of a user, monochrome printing ink, closest to the hue of the mixing color piece, of the hue is found to be reserved printing ink in the monochrome printing ink which forms the mixing color piece and meets the set condition, and other monochrome printing ink except the reserved printing ink is processed with fading and trapping. When the method chooses the reserved printing ink, three indexes of the hue of the printing ink, the saturation and the brightness are overall considered, the reserved printing ink which is chosen at last is closer to the original mixing color piece in the visual effect, and the visual effect of the photo is better after changing color fading and trapping.
Description
Technical field
The present invention relates to the trapping technical field in the image processing, be specifically related to a kind of method and system of color fading and trapping.
Background technology
Trapping also makes mending-leakage white, be called again scalable, be mainly for make up because of the printing register trouble cause two leakages between adjacent different colours white.When the printed matter, always sensation is dark close to human eye as people, and therefore light color, original copy being carried out trapping when processing, always manage not allow dark lower light color expose, and top dark color remains unchanged, and does not affect visual effect with assurance away from human eye.
Color fading and trapping (pullback) is trapping technology before a kind of packing seal, namely working as object is made of a dark ink and a plurality of light color inks, dark ink and light color inks difference in brightness are very large, and when object bounds one side is blank or white, cause significantly " color limit " for fear of cause light color inks to expose in color edges due to register trouble, light color inks inwardly need to be shunk certain width.After printing, because the dark ink of constriction and former object printing ink are all dark, so human eye is difficult for realizing, and the shallow printing ink of brightness can not surpass object bounds after the chromatography skew, leaks look to the problem of blank thereby solved.The trapping method that exists at present mainly contains two classes: based on the trapping method (as the Photoshop image trapping) of neighborhood with based on the trapping method on border.Existing trapping method is based on brightness and judges and allow the reservation printing ink of look, be the brightness of each color separation, keep brightness minimum in former color lump and namely allow look after the darkest printing ink, due to the impact of not considering the form and aspect factor when the trapping, keeping printing ink and former color lump, to compare the visual effect difference too large, and visual effect is not ideal.
Summary of the invention
For the defective that exists in prior art, the object of the present invention is to provide a kind of method and system of color fading and trapping, reservation printing ink when the method and system adopt brightness, saturation and form and aspect combination to judge the color fading and trapping processing, make that to keep the printing ink effect of comparing with former color lump more approaching, visual effect is better.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of method of color fading and trapping comprises the following steps:
(1) selectedly treat the trapping image, treat that with described the trapping image is converted into simple color lump, and find out the colour mixture color lump in simple color lump; Described simple color lump is the color lump that the printing ink by same color consists of; Described colour mixture color lump refers to mix the color lump that consists of, n 〉=2 by n monochrome ink;
(2) extract form and aspect, saturation and the brightness of described colour mixture color lump and a plurality of monochrome inks thereof;
(3) find out in saturation and brightness all reach the monochrome ink of setting threshold separately form and aspect and the form and aspect of mixing color lump the hue circle colouring at a distance of from the monochrome ink of minimum as keeping printing ink;
(4) keep keeping printing ink constant, the set point of shrinking inside according to printing ink of the monochrome ink outside reservation printing ink done color fading and trapping process.
Further, the method for a kind of color fading and trapping as above is in step (1), after finding out the colour mixture color lump, whether the adjacent color lump that judges the colour mixture color lump is white color lump, if this colour mixture color lump generation color fading and trapping, color fading and trapping does not occur this colour mixture color lump if not.
Further, the method for a kind of color fading and trapping as above if in the monochrome ink of formation colour mixture color lump, black ink is arranged, is set as black ink reservation printing ink.
Further, the method for a kind of color fading and trapping as above, in step (3), the monochrome ink of finding out the form and aspect difference minimum of form and aspect and mixing color lump as the concrete steps that keep printing ink is:
A) keep saturation greater than setting threshold I and the brightness monochrome ink greater than setting threshold II;
B) monochrome ink of form and aspect difference minimum of finding out form and aspect in the monochrome ink that keeps in a) in step and mixing color lump is as keeping printing ink.
Further, the method for a kind of color fading and trapping as above, step a) in, described saturation does not comprise Yellow ink greater than setting threshold I and brightness greater than the monochrome ink of setting threshold II.
Further, the method for a kind of color fading and trapping as above, step a) in, setting threshold I is 0.3, setting threshold II is 0.6.
Further, the method for a kind of color fading and trapping as above when all monochrome inks of colour mixture color lump all do not satisfy step a) during conditional, selects the monochrome ink of saturation maximum in the colour mixture color lump as keeping printing ink.
Further, the method for a kind of color fading and trapping as above, select the monochrome ink of saturation maximum in the colour mixture color lump as the concrete mode that keeps printing ink to be:
At first search whether to have in the monochrome ink of non-yellow and satisfy the monochrome ink that imposes a condition, if select the satisfied monochrome ink that sets up saturation maximum in printing ink that imposes a condition as keeping printing ink; Select if not the monochrome ink of saturation maximum in yellow as keeping printing ink.
Further, the method for a kind of color fading and trapping as above, described impose a condition refer to saturation less than 0.21 and brightness greater than 0.85.
Further again, the method for a kind of color fading and trapping as above, if the saturation that keeps printing ink less than 0.1 and brightness greater than 0.9 o'clock, described mixing color lump is not done color fading and trapping and is processed.
Further, the method for a kind of color fading and trapping as above, in step (4), the scope of described set point is 0～25 millimeter.
System based on a kind of color fading and trapping of above-mentioned color fading and trapping method comprises:
Color lump conversion equipment: be used for treating that with described the trapping image is converted into simple color lump, and find out the colour mixture color lump in simple color lump; Described simple color lump refers to the color lump that the printing ink by same color consists of; Described colour mixture color lump refers to mix the color lump that consists of, n 〉=2 by n monochrome ink;
Attributes extraction device: be used for extracting form and aspect, saturation and the brightness of described colour mixture color lump and a plurality of monochrome inks thereof;
Keep the printing ink deriving means: the monochrome ink that is used for that saturation and brightness are reached respectively the monochrome ink form and aspect of setting threshold separately and mixes color lump difference minimum is as keeping printing ink;
Color fading and trapping device: be used for keeping the color fading and trapping processing of other monochrome ink outside printing ink.
Further, the system of a kind of color fading and trapping as above, described reservation printing ink deriving means also comprises:
Saturation screening unit: be used for keeping the monochrome ink that saturation meets setting threshold I;
Brightness screening unit: be used for keeping the monochrome ink that brightness meets setting threshold II;
The form and aspect comparing unit: be used for the form and aspect of the monochrome ink that saturation screening unit and brightness screening unit relatively keeps and the form and aspect of mixing color lump, with the form and aspect of monochrome ink and the monochrome ink of form and aspect difference minimum that mixes color lump as keeping printing ink.
Effect of the present invention is: method and system of the present invention, during reservation printing ink in the judgement color fading and trapping is processed, form and aspect, saturation and three indexs of brightness of printing ink are considered, make reservation printing ink and former color lump visually more approaching, the better effects if of trapping.
Description of drawings
Fig. 1 is the former color lump figure before color fading and trapping is processed;
Fig. 2 now judges reservation printing ink with technology according to brightness for adopting, and the former color lump in Fig. 1 is carried out design sketch after color fading and trapping;
The structured flowchart of a kind of color fading and trapping of Fig. 3 the present invention system;
Fig. 4 is the flow chart of a kind of color fading and trapping method of the present invention;
Fig. 5 finds out the flow chart that keeps printing ink in embodiment;
Fig. 6 is for adopting the method for the invention to carry out design sketch after color fading and trapping to the former color lump in Fig. 1.
Embodiment
Main thought of the present invention is when allowing look keep printing ink based on bright judgement in existing trapping method, do not consider the impact of form and aspect factor, keeping printing ink and former color lump, to compare the visual effect difference too large, the problem that visual effect is undesirable, the a kind of of proposition adopts the combination of brightness and form and aspect to judge the method that allows look keep printing ink, make reservation printing ink and former color lump compare visual effect more approaching, result is better.
In order to understand better the present invention, at first related correlation technique is carried out brief description:
The color measurement model of form and aspect is HSB models, and in the HSB pattern, H (hues) represents form and aspect, and S (saturation) represents saturation, and B (brightness) represents brightness.Medium corresponding to HSB pattern is human eye.It expands to saturation (S) and lightness (B) with " depth " concept of our human brain HSB.At first the intuitive sense of people to color be form and aspect, and namely in the blue purple of red orange-yellow green cyan, be then its weight.So-called saturation represents the purity of color, is equivalent to the color density of home television set, and the high color of saturation is more gorgeous, and the low color of saturation is just near grey.Lightness is equal to the brightness of color television set also referred to as brightness, and the high color of brightness is bright, and the low color of brightness is dim, brightness is the highest obtain pure white, the minimum black that obtains.
Existing trapping method basically all is based on brightness and judges and allow look keep printing ink, with the brightness minimum complete color fading and trapping as keeping printing ink, but this effect is unsatisfactory.As shown in fig. 1, for the colour mixture color lump that is consisted of by C (cyan) and two kinds of printing ink of M (magenta), in this embodiment, the brightness of cyan is 91.37, and pinkish red brightness is 89.41, when keeping printing ink by existing method judgement, because the brightness of magenta is little, so pinkish red as reservation printing ink, cyan is carried out color fading and trapping, as shown in Figure 2.Monochromatic on visual effect, cyan is the color of more approaching and original color lump printing ink in fact, so carry out color fading and trapping by prior art, iff considering brightness, keeps printing ink and compares visual effect with former color lump to understand difference larger.The present invention keeps the judgement of printing ink when adopting the trapping of carrying out on the basis that considers of HSB color space to form and aspect, saturation and three indexs of brightness of printing ink.
The present invention is described in further detail below in conjunction with Figure of description and embodiment.
Fig. 3 shows the structured flowchart of a kind of color fading and trapping of the present invention system, and this system mainly comprises with lower device as can be seen from Figure:
Color lump conversion equipment 31: be used for treating that with described the trapping image is converted into simple color lump, and find out the colour mixture color lump in simple color lump; Described colour mixture color lump refers to mix the color lump that consists of, n 〉=2 by n monochrome ink;
Attributes extraction device 32: be used for extracting form and aspect, saturation and the brightness of described colour mixture color lump and a plurality of monochrome inks thereof;
Keep printing ink deriving means 33: be used for that saturation and brightness are reached respectively the monochrome ink form and aspect of setting threshold separately and mix color lump near the monochrome ink of (difference is minimum) as keeping printing ink; This device has comprised following unit:
Saturation screening unit: be used for keeping the monochrome ink that saturation meets setting threshold I;
Brightness screening unit: be used for keeping the monochrome ink that brightness meets setting threshold II;
The form and aspect comparing unit: be used for the form and aspect of the monochrome ink that saturation screening unit and brightness screening unit relatively keeps and the form and aspect of mixing color lump, with the form and aspect of monochrome ink and the form and aspect of mixing color lump near the monochrome ink of (difference is minimum) as keeping printing ink.
Color fading and trapping device 34: be used for keeping the color fading and trapping processing of other monochrome ink outside printing ink.
Fig. 4 shows the flow chart based on a kind of color fading and trapping method of color fading and trapping system in Fig. 3, and the method mainly comprises the following steps:
Step S41: will treat that the trapping image is converted into simple color lump, and select colour mixture color lump wherein;
Selected treat the trapping image, treat that with described the trapping image is converted into simple color lump, and find out in simple color lump and mix by a plurality of monochrome inks the colour mixture color lump that consists of, wherein, simply color lump refers to the color lump that the printing ink by same color consists of; The colour mixture color lump has at least two monochrome inks to mix formation.After finding out the colour mixture color lump, also need to judge by the adjacent color lump of colour mixture color lump whether the colour mixture color lump needs to occur color fading and trapping, allowed the adjacent color lump of colour mixture color lump be to be white color lump, if this colour mixture color lump generation color fading and trapping is for non-white color lump color fading and trapping does not occur this colour mixture color lump.This embodiment is selected and is comprised the colour mixture color lump that is made of C and two kinds of printing ink of M in Fig. 1.
Step S42: extract the colour mixture color lump and consist of form and aspect, saturation and the brightness of the monochrome ink of this color lump;
After finding out the colour mixture color lump that need to carry out color fading and trapping by step S41, form and aspect, saturation and the brightness of extracting the colour mixture color lump and consisting of the monochrome ink of this colour mixture color lump.Colour mixture color lump in Fig. 1,238.32 ° of form and aspect, saturation are 78.64%, brightness is 53.33%; The form and aspect of cyan C are 198.8 °, and saturation is 100%, and brightness is 91.37%; The form and aspect of pinkish red M are 326.56 °, and saturation is 100%, and brightness is 89.41%.
Step S43: find out reservation printing ink;
When finding out reservation printing ink, the user can set the saturation of needed reservation printing ink and the setting threshold that brightness will reach as required, then the immediate monochrome ink of form and aspect of finding out form and aspect in saturation and brightness all reach the monochrome ink of setting threshold separately and mixing color lump is as keeping printing ink, if in all monochrome inks, all degree of reaching capacity and brightness separately during setting threshold, do not select the monochrome ink of saturation maximum in the colour mixture color lump as keeping printing ink.If but in the monochrome ink of formation colour mixture color lump, black ink is arranged, directly black ink is set as reservation printing ink.
Find out the particular flow sheet of reservation printing ink in this step as shown in Figure 5:
A) at first, keep saturation greater than setting threshold I (in this embodiment, value is 0.3) and the brightness monochrome ink greater than setting threshold II (in this embodiment, value is 0.6);
B) if exist and to satisfy a) monochrome ink of conditional, with form and aspect in the monochrome ink that keeps in a) and the form and aspect of mixing color lump near the monochrome ink of (in the hue circle colouring at a distance of from recently) as keeping printing ink; If there is no a) the monochrome ink of conditional, the monochrome ink of selecting saturation maximum in the colour mixture color lump are as keeping printing ink, and be specific as follows:
At first search and whether have in the monochrome ink of non-yellow and satisfy and to impose a condition (in this embodiment impose a condition for saturation less than 0.21 and brightness greater than 0.85) monochrome ink, if the conduct that sets up saturation maximum in printing ink of selecting to satisfy condition keeps printing ink; Select if not the monochrome ink of saturation maximum in yellow as keeping printing ink.
Wherein, step a) in saturation do not comprise Yellow ink greater than setting threshold I and brightness greater than the monochrome ink of setting threshold II, even this be because saturation and brightness all larger Yellow ink be also visually very shallow.In addition, if the saturation by the resulting reservation printing ink of this step less than 0.1 and brightness greater than 0.9 o'clock, mix color lump and do not do color fading and trapping and process because very shallow during reservation printing ink at this moment, allow look process even do, almost there is no what effect yet.
In present embodiment, saturation for cyan and pinkish red two kinds of monochrome inks is 100%, so two kinds of printing ink all satisfies the condition of step in a), and in two kinds of printing ink, the form and aspect (238.32 °) of the form and aspect of cyan (198.8 °) and colour mixture color lump are the most approaching, thus with cyan as keeping printing ink.
Step S44: other monochrome ink that keeps outside printing ink is carried out color fading and trapping.
After determining to keep printing ink by step S43, keep keeping printing ink constant, the monochrome ink color fading and trapping that keeps outside printing ink is processed.When doing the color fading and trapping processing, the user can arrange the scope that monochrome ink inwardly shrinks according to the actual needs, and the general scope of setting is 0～25 millimeter, and the default value of generally selecting in actual applications is 0.2 millimeter, carries out color fading and trapping according to this set point.
By said method of the present invention, former color lump in Fig. 1 is carried out figure as a result that color fading and trapping processes (reservation printing ink is cyan) as shown in Figure 6, compare with Fig. 2 that prior art was processed, as more approaching with former color lump in the reservation printing ink (printing ink of processing for doing trapping) in 6, visual effect is better.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technology thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (13)
1. the method for a color fading and trapping comprises the following steps:
(1) selectedly treat the trapping image, treat that with described the trapping image is converted into simple color lump, and find out the colour mixture color lump in simple color lump; Described simple color lump refers to the color lump that the printing ink by same color consists of; Described colour mixture color lump refers to mix the color lump that consists of, n 〉=2 by n monochrome ink;
(2) extract form and aspect, saturation and the brightness of described colour mixture color lump and a plurality of monochrome inks thereof;
(3) find out in saturation and brightness all reach the monochrome ink of setting threshold separately form and aspect and the form and aspect of mixing color lump the hue circle colouring at a distance of from the monochrome ink of minimum as keeping printing ink;
(4) keep keeping printing ink constant, the set point of shrinking inside according to printing ink of the monochrome ink outside reservation printing ink done color fading and trapping process.
2. the method for a kind of color fading and trapping as claimed in claim 1, it is characterized in that: in step (1), after finding out the colour mixture color lump, judge whether the adjacent color lump of colour mixture color lump is white color lump, if this colour mixture color lump generation color fading and trapping, color fading and trapping does not occur in this colour mixture color lump if not.
3. the method for a kind of color fading and trapping as claimed in claim 1, is characterized in that: in step (3), if in the monochrome ink of formation colour mixture color lump, black ink is arranged, black ink is set as reservation printing ink.
4. the method for a kind of color fading and trapping as claimed in claim 1 is characterized in that: in step (3), the monochrome ink of finding out form and aspect and mixing the form and aspect difference minimum of color lump as the concrete steps that keep printing ink is:
A) keep saturation greater than setting threshold I and the brightness monochrome ink greater than setting threshold II;
B) monochrome ink of form and aspect difference minimum of finding out form and aspect in the monochrome ink that keeps in a) in step and mixing color lump is as keeping printing ink.
5. a kind of color fading and trapping method as claimed in claim 4 is characterized in that: step a) in, described saturation does not comprise Yellow ink greater than setting threshold I and brightness greater than the monochrome ink of setting threshold II.
6. a kind of color fading and trapping method as described in claim 4 or 5 is characterized in that: step a) in, setting threshold I is 0.3, setting threshold II is 0.6.
7. a kind of color fading and trapping method as described in claim 4 or 5 is characterized in that: when all monochrome inks of colour mixture color lump all do not satisfy step a) during conditional, select the monochrome ink of saturation maximum in the colour mixture color lump as keeping printing ink.
8. the method for a kind of color fading and trapping as claimed in claim 7 is characterized in that: select the monochrome ink of saturation maximum in the colour mixture color lump as the concrete mode that keeps printing ink to be:
At first search whether to have in the monochrome ink of non-yellow and satisfy the monochrome ink that imposes a condition, if select the satisfied monochrome ink that sets up saturation maximum in printing ink that imposes a condition as keeping printing ink; Select if not the monochrome ink of saturation maximum in yellow as keeping printing ink.
9. the method for a kind of color fading and trapping as claimed in claim 8 is characterized in that: described impose a condition refer to saturation less than 0.21 and brightness greater than 0.85.
10. a kind of color fading and trapping method as claimed in claim 7 or 8 is characterized in that: if the saturation that keeps printing ink less than 0.1 and brightness greater than 0.9 o'clock, described mixing color lump is not done color fading and trapping and is processed.
11. a kind of color fading and trapping method as claimed in claim 1 is characterized in that: in step (4), the scope of described set point is 0～25 millimeter.
12. the system of a color fading and trapping comprises:
Color lump conversion equipment: be used for treating that with described the trapping image is converted into simple color lump, and find out the colour mixture color lump in simple color lump; Described simple color lump refers to the color lump that the printing ink by same color consists of; Described colour mixture color lump refers to mix the color lump that consists of, n 〉=2 by n monochrome ink;
Attributes extraction device: be used for extracting form and aspect, saturation and the brightness of described colour mixture color lump and a plurality of monochrome inks thereof;
Keep the printing ink deriving means: the monochrome ink that is used for that saturation and brightness are reached respectively the monochrome ink form and aspect of setting threshold separately and mixes color lump difference minimum is as keeping printing ink;
Color fading and trapping device: be used for keeping the color fading and trapping processing of other monochrome ink outside printing ink.
13. the system of a kind of color fading and trapping as claimed in claim 12 is characterized in that: described reservation printing ink deriving means also comprises:
Saturation screening unit: be used for keeping the monochrome ink that saturation meets setting threshold I;
Brightness screening unit: be used for keeping the monochrome ink that brightness meets setting threshold II;
The form and aspect comparing unit: be used for the form and aspect of the monochrome ink that saturation screening unit and brightness screening unit relatively keeps and the form and aspect of mixing color lump, with the form and aspect of monochrome ink and the monochrome ink of form and aspect difference minimum that mixes color lump as keeping printing ink.
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| US7391536B2 (en) * | 2004-07-09 | 2008-06-24 | Xerox Corporation | Method for smooth trapping suppression of small graphical objects using color interpolation |
| CN101610343A (en) * | 2008-06-16 | 2009-12-23 | 北京大学 | A kind of method and system of automatic trapping |
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