CN111038135A - Method for improving printing quality of transparent layer in thermal sublimation printer - Google Patents
Method for improving printing quality of transparent layer in thermal sublimation printer Download PDFInfo
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- CN111038135A CN111038135A CN201911356409.6A CN201911356409A CN111038135A CN 111038135 A CN111038135 A CN 111038135A CN 201911356409 A CN201911356409 A CN 201911356409A CN 111038135 A CN111038135 A CN 111038135A
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- 238000007639 printing Methods 0.000 title claims abstract description 91
- 238000000859 sublimation Methods 0.000 title claims abstract description 14
- 230000008022 sublimation Effects 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 230000006698 induction Effects 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 description 78
- 238000009500 colour coating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/382—Contact thermal transfer or sublimation processes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
- G06F3/1208—Improving or facilitating administration, e.g. print management resulting in improved quality of the output result, e.g. print layout, colours, workflows, print preview
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Abstract
The method for improving the printing quality of the transparent layer in the thermal sublimation printer comprises the steps of generating transparent layer original data with the same data of each pixel before printing the transparent layer, calculating compensation data of the transparent layer for each pixel in the transparent layer original data according to a relational equation of printing effect of each color YMC of image data transferred on a printing medium on the transparent layer, carrying out large-range fuzzification calculation on the compensation data of the transparent layer to generate final transparent layer printing data, and finally, taking the final transparent layer printing data as the heating data of a final thermal induction head to finish final printing. Because the finally generated printing data of the transparent layer is calculated according to the influence of the transferred image on the printing medium on the printing effect of the transparent layer, the problem that the printing quality is influenced due to insufficient or overlarge heating energy of partial area on the printing medium can be solved.
Description
Technical Field
The invention belongs to the field of thermal sublimation printing, and particularly relates to a method for improving printing quality of a transparent layer in a thermal sublimation printer.
Background
The basic principle of dye sublimation printing is to transfer dye to a print medium, such as photographic paper, PVC card, etc., by heating a dye coating on a ribbon. Since the dye transferred to the surface of the printing medium is scraped or faded due to friction or light, most of the printers based on the dye sublimation printing technique print a transparent layer on the printing medium to which the dye is transferred, thereby preventing light aging or scratch resistance, as shown in fig. 1.
Conventional thermal sublimation printing prints the transparent layer in a uniform manner. However, the specific physical and chemical properties of the transparent layer may result in poor final print quality. The specific physical and chemical properties of the transparent layer include: (1) the optical refractive index of the transparent layer is influenced by different heating energy; (2) before the transparent layer is printed, whether the printing medium is colored or not influences the transfer printing efficiency of the transparent layer; (3) the excessive energy causes the ribbon and the print medium to be difficult to separate and the print parameters to be difficult to control. By adopting the characteristics, if good printing parameters are not applied, the printing medium is easy to see a plurality of problems caused by poor printing of the transparent layer under a specific angle and light.
Object of the Invention
In order to solve the above problems, the present invention provides a method for improving the printing quality of a transparent layer in a thermal sublimation printer, which can prevent the printing quality from being affected by insufficient heating energy or excessive heating energy in a partial area of a printing medium.
The method for improving the printing quality of the transparent layer in the thermal sublimation printer comprises the following steps:
step 2, calculating transparent layer compensation data according to the transferred image data on the printing medium:
using cubic polynomial to approximate the relation of yellow Y, magenta M and cyan C to the transfer efficiency of the transparent layer O respectively as follows:
f(x)＝Σ(aixi)＝a3x3+a2x2+a1x+a0
f(y)＝Σ(biyi)＝b3y3+b2y2+b1y+b0
f(z)＝Σ(cizi)＝c3z3+c2z2+c1z+c0
wherein, f (x) represents the relationship between yellow Y and the printing effect of the transparent layer, f (Y) represents the relationship between magenta M and the printing effect of the transparent layer, and f (z) represents the relationship between cyan C and the printing effect of the transparent layer, and the relationships are approximated by cubic polynomials as shown in fig. 3; x, Y, z represent data of a single pixel of yellow Y, magenta M, cyan C, respectively, and i is a plurality of itemsExponent of formula, coefficient of polynomial a0、a1、a2、a3、b0、b1、b2、b3、c0、c1、c2、c3Obtained through experimental statistics;
transparent layer compensation data O calculated from the image data transferred onto the printing medium:
O＝OB*F(x,y,z)
wherein OB is transparent layer original data, F (x, y, z) α/(F (x) F (y) F (z)), α is compensation coefficient, α is determined according to experimental result and is a constant;
step 3, performing large-range fuzzification calculation on the transparent layer compensation data calculated in the step 2 by using a fuzzy algorithm to generate final transparent layer printing data O':
O’＝Blur(O)
wherein, O' is the final transparent layer printing data, O is the transparent layer compensation data calculated in step 2, and Blur () is a blurring function;
and 4, calculating to obtain final transparent layer printing data O 'according to the step 3, wherein the final transparent layer printing data O' is used as heating data of the final thermal induction head, and the ink ribbon is heated by lower energy on the block printed with the ground color, so that the phenomenon that the printing effect of the transparent layer falls into a matt area or the printing quality is influenced due to the fact that the viscosity between the ink ribbon and the printing medium is high because the transfer efficiency is too high is avoided.
The blurring function Blur ():
Blur(O)＝ScaleUp(ScaleDown(O))
wherein, scaledon () is a reduction function; ScaleUp () is a magnification function.
According to the invention, the compensated transparent layer printing data is obtained through calculation according to the transferred image data on the printing medium, and the problem that the printing quality is influenced due to insufficient or overweight heating energy of partial area on the printing medium can be solved because the finally generated transparent layer printing data is calculated according to the influence of the transferred image on the printing medium on the printing effect of the transparent layer.
Drawings
FIG. 1 is a printing flow diagram of a sublimation printer;
FIG. 2 is a graph of the effect of thermal head data on a transparent layer without considering the effect of print image data on the transfer efficiency of the transparent layer;
FIG. 3 is a graph of print data for a color coating versus transfer efficiency for a transparent layer;
fig. 4 is a flow chart of the operation of the present invention.
The invention is described in further detail below with reference to the accompanying drawings.
Detailed Description
Take printing yellow Y, magenta M, cyan C plus the transparent layer O as an example.
In the case where the effect of the image data (YMC) on the transfer efficiency of the transparent layer is not taken into consideration, the effect relationship of the thermal head data on the transparent layer is as shown in fig. 2, and in order to achieve a good printing effect, the data of the transparent layer should be controlled within the gloss region of the red frame line.
Ideally, good printing results can be obtained by selecting appropriate data in the gloss area of fig. 2 as the print information of the transparent layer. However, the image data (YMC) may affect the transfer efficiency of the transparent layer, and if the compensation of the transparent layer data is not performed based on the image data (YMC), the transparent layer printing effect on the partial image may fall into the matte region. The transfer efficiency relationship of the print data of the color coating layer to the transparent layer is substantially as shown in fig. 3.
As shown in fig. 4, the method for improving the printing quality of the transparent layer in the thermal sublimation printer of the invention comprises the following steps:
step 2, calculating transparent layer compensation data according to the transferred image data YMC on the printing medium:
using cubic polynomial to approximate the relation of yellow Y, magenta M and cyan C to the transfer efficiency of the transparent layer O respectively as follows:
f(x)＝Σ(aixi)＝a3x3+a2x2+a1x+a0
f(y)＝Σ(biyi)＝b3y3+b2y2+b1y+b0
f(z)＝Σ(cizi)＝c3z3+c2z2+c1z+c0
wherein, f (x) represents the relationship between yellow Y and the printing effect of the transparent layer, f (Y) represents the relationship between magenta M and the printing effect of the transparent layer, and f (z) represents the relationship between cyan C and the printing effect of the transparent layer, and the relationships are approximated by cubic polynomials as shown in fig. 3; x, Y and z respectively represent data of single pixels of yellow Y, magenta M and cyan C, i is an index of a polynomial, and coefficients a of the polynomial0、a1、a2、a3、b0、b1、b2、b3、c0、c1、c2、c3Obtained through experimental statistics;
transparent layer compensation data O calculated from the image data transferred onto the printing medium:
O＝OB*F(x,y,z)
wherein OB is transparent layer original data, F (x, y, z) α/(F (x) F (y) F (z)), α is compensation coefficient, α is determined according to experimental result and is a constant;
the compensated transparent layer data O is equal to the original data OB multiplied by a function F () of the data Y, M, C in the image pixel, and this function F () is inversely proportional to F (x) F (Y) F (z);
step 3, performing large-range fuzzification calculation on the calculated transparent layer compensation data to generate final transparent layer printing data O':
since the transparent layer compensation algorithm in step 2 is to calculate each pixel in the image, if the difference between the data calculated by adjacent pixels is too large, the printing result of the transparent layer will appear uneven, so that it is necessary to perform a large-scale blurring calculation on the transparent layer compensation data calculated in step 2 by using a blurring algorithm, thereby reducing the sharpness of the transparent layer compensation data: o' ═ Blur (O)
Wherein, O' is the final transparent layer printing data, O is the transparent layer compensation data calculated in step 2, and Blur () is a blurring function;
in this embodiment, the following blurring function bur () is used, but the method is not limited to this:
Blur(O)＝ScaleUp(ScaleDown(O))
wherein, scaledon () is a reduction function; ScaleUp () is a magnification function.
And 4, calculating to obtain final transparent layer printing data O 'according to the step 3, wherein the final transparent layer printing data O' is used as heating data of the final thermal induction head, and the ink ribbon is heated by lower energy on the block printed with the ground color, so that the phenomenon that the printing effect of the transparent layer falls into a matt area or the printing quality is influenced due to the fact that the viscosity between the ink ribbon and the printing medium is high because the transfer efficiency is too high is avoided.
The invention is characterized in that: before printing the transparent layer, generating transparent layer original data with the same data of each pixel, calculating compensation data of the transparent layer for each pixel in the transparent layer original data according to a relational equation of printing effect of each color YMC of image data transferred on a printing medium on the transparent layer, performing large-range fuzzification calculation on the compensation data of the transparent layer to generate final transparent layer printing data, and finally, taking the final transparent layer printing data as the heating data of the final thermal induction head to finish final printing.
From fig. 2, it can be seen that the data of the transparent layer must fall within the red frame for optimal printing. When the print medium has a printed image (such as YMC data), the raw data of the transparent layer, if not corrected, may cause the transparent layer to enter the diagonal area to the right of the red frame in fig. 2, which may cause the printing effect of the transparent layer to appear matt, and steps 2 and 3 of the present invention adjust the pixels that would enter the matt area if printed using the raw data to compensate for the data (usually, to down), and cause the transparent layer on the pixels to return to the red frame area in fig. 2.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (2)
1. The method for improving the printing quality of the transparent layer in the thermal sublimation printer is characterized by comprising the following steps:
step 1, before printing the transparent layer, generating transparent layer original data with the same data of each pixel:
step 2, calculating transparent layer compensation data according to the transferred image data on the printing medium:
using cubic polynomial to approximate the relation of yellow Y, magenta M and cyan C to the transfer efficiency of the transparent layer O respectively as follows:
f(x)＝Σ(aixi)＝a3x3+a2x2+a1x+a0
f(y)＝Σ(biyi)＝b3y3+b2y2+b1y+b0
f(z)＝Σ(cizi)＝c3z3+c2z2+c1z+c0
wherein, f (x) represents the relationship between yellow Y and the printing effect of the transparent layer, f (Y) represents the relationship between magenta M and the printing effect of the transparent layer, and f (z) represents the relationship between cyan C and the printing effect of the transparent layer, and the relationships are approximated by cubic polynomials as shown in fig. 3; x, Y and z respectively represent data of single pixels of yellow Y, magenta M and cyan C, i is an index of a polynomial, and coefficients a of the polynomial0、a1、a2、a3、b0、b1、b2、b3、c0、c1、c2、c3Obtained through experimental statistics;
transparent layer compensation data O calculated from the image data transferred onto the printing medium:
O＝OB*F(x,y,z)
wherein OB is transparent layer original data, F (x, y, z) α/(F (x) F (y) F (z)), α is compensation coefficient, α is determined according to experimental result and is a constant;
step 3, performing large-range fuzzification calculation on the transparent layer compensation data calculated in the step 2 by using a fuzzy algorithm to generate final transparent layer printing data O':
O’＝Blur(O)
wherein, O' is the final transparent layer printing data, O is the transparent layer compensation data calculated in step 2, and Blur () is a blurring function;
and 4, calculating to obtain final transparent layer printing data O 'according to the step 3, wherein the final transparent layer printing data O' is used as heating data of the final thermal induction head, and the ink ribbon is heated by lower energy on the block printed with the ground color, so that the phenomenon that the printing effect of the transparent layer falls into a matt area or the printing quality is influenced due to the fact that the viscosity between the ink ribbon and the printing medium is high because the transfer efficiency is too high is avoided.
2. The method for improving the print quality of the transparent layer in the sublimation printer of claim 1, wherein the blurring function Blur ():
Blur(O)＝ScaleUp(ScaleDown(O))
wherein, scaledon () is a reduction function; ScaleUp () is a magnification function.
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| CN201911356409.6A CN111038135A (en) | 2019-12-25 | 2019-12-25 | Method for improving printing quality of transparent layer in thermal sublimation printer |
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| CN201911356409.6A CN111038135A (en) | 2019-12-25 | 2019-12-25 | Method for improving printing quality of transparent layer in thermal sublimation printer |
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- 2019-12-25 CN CN201911356409.6A patent/CN111038135A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 何新光: "《静电复印机高速数码印刷机原理与维修技术》", 30 April 1994, 北京：人民邮电出版社 * |
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