JP2000321686A - Colorimetric reproduction duplication producing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce duplication in the form suited for an environment in which a user performs an observation by transforming colorimetric values under various light sources into picture output signal values in photographic materials comformed to an object while using a second translation table. SOLUTION: A production part 10 transforms picture input data receiving from an input part 12 into colorimetric value data by using the first translation table comformed to photographic materials of an original sample picture and an observation light source and, next, it transforms the colorimetric value data into picture output data by using the second translation table comformed to photographic materials for output and an observation light source. Moreover, the part produces plural picture output data by changing the observation light and calculates one final picture output data by a prescribed functional operation to output the picture output data to an output part 14. The second translation table calculates colorimetric values from spectral transmissivity data which are obtained by measuring the chart 24 outputted from the output part 14 with a spectral colorimeter 16 and previously prepared light source spectral distribution data and produces the picture output data while making these colorimetric values and output signals of chart data at the time of producing the chart 24 correspond each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for making a duplicate of a photographic light-sensitive material, and more particularly to a method and an apparatus for preparing a colorimetric reproduction duplication for digitally duplicating a transmissive photographic light-sensitive material such as a reversal film. .

[0002]

2. Description of the Related Art Hitherto, so-called duplication in which another positive film is duplicated from a positive film (reversal color film) for slide screening or printing has been performed. In the case of performing reversal film duplication, recently, a digital duplication system using a scanner, a film recorder, and a digital output film has begun to spread. In such a system, when the same type of film is used for both the original and the output, the color reproduction accuracy is high. The fact is that the color reproduction accuracy decreases.

Conventionally, as a method of color matching for digital duplication, for example, a duplication system for performing color matching with software attached to a film recorder is known. Specifically, for example, Symbol
ic Sciences International's software, Fire
Ware. This is because the measurement system is a densitometer and scanner, and a one-dimensional lookup table (1DLUT)
And a three-dimensional look-up table (3DLUT) of a scanner and an output unit, and the output unit is a film recorder Light Jet.

[0004]

However, in the conventional duplication system, a gray 1D
Using the LUT to match the density of the input and output light-sensitive materials, and trying to reproduce the same as the original using the 3DLUT of the scanner and output device, the signal of the scanner and the film recorder is based on the density. And then performing signal conversion and performing density reproduction, there is a problem that colorimetric color matching cannot be actually performed. That is,
Even if the densities match, the conversion is performed on the basis of the signal of the scanner and the film recorder, so that there is a problem that something slightly different in appearance is produced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and a method and apparatus for creating a colorimetric reproduction duplication capable of creating a duplication in a form suitable for an environment in which a user views a duplicate film. The task is to provide

[0006]

In order to solve the above-mentioned problems, the present invention is to record an image input signal value of an object of duplication and to apply a spectral distribution of a plurality of various light sources to the image input signal value. Using a first conversion table showing the relationship between data and image input signal values and colorimetric values under a predetermined light source, calorimetric values under a plurality of various light sources are calculated, and colorimetric values under a predetermined light source are calculated. Using a second conversion table showing the relationship between the image output signal value and the colorimetric values under the various light sources, to convert the image output signal value to obtain a photographic material that matches the object, One image output signal value is obtained by a predetermined operation from a plurality of image output signal values obtained for various light sources, and is output to a photographic material that matches the object according to the image output signal value. Colorimetry characterized by the fact that To provide a dupe publication creation method.

Further, regarding the second conversion table,
A chart for creating a conversion table is output, the chart is measured with a predetermined light source, colorimetric values under a predetermined light source are calculated using light source spectral distribution data prepared in advance, and the colorimetric value and the chart are calculated. From the relationship with the image output signal value at the time of output, while creating the second conversion table,
For the first conversion table, the chart is image-recorded, an image input signal value is obtained, and the image output signal value of the chart is made to correspond to the chart output signal value, and the image input signal value is calculated using the second conversion table. And the relationship between the colorimetric values and
Preferably, the first conversion table is created.

Further, it is preferable that the first and second conversion tables are obtained by providing a table created in advance from outside.

It is preferable that the predetermined calculation is a weighted average of the plurality of image output signal values.

The photographic material is preferably a transmission type photographic material.

Further, the photographic material is preferably a digital output light-sensitive material.

[0012] Similarly, in order to solve the above problems,
The present invention provides an image input signal value holding unit for holding an image input signal value obtained by recording from an object of duplication, and an observation light source spectral distribution data holding unit for holding observation light source spectral distribution data measured in advance. And, a first conversion table indicating a relationship between the image input signal value and the colorimetric value under the predetermined light source, and a relationship between the colorimetric value under the predetermined light source and the image output signal value. A second conversion table, and referring to the observation light source spectral distribution data, and using the first conversion table, convert the image input signal value into a colorimetric value under various light sources. Unit, using the second conversion table, to convert the colorimetric values under the various light sources into image output signal values, perform a predetermined operation on the image output signal values for the various light sources, and obtain final image data An image output data conversion unit for calculating Providing colorimetric reproduction dupe Publication creating apparatus characterized by comprising a.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for producing a colorimetric reproduction duplication according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings. When a user observes a duplicated film, it is projected and viewed, for example, by seeing through a shakasten or the like, and observation is performed using various observation light sources. It is intended to create a color duplication.

FIG. 1 is a block diagram showing an example of a digital duplication system incorporating a colorimetric reproduction duplication production apparatus according to one embodiment of the present invention. The digital duplication system according to the present embodiment performs duplication of a reversal film. As shown in FIG. 1, the digital duplication system mainly includes a duplication creation device (hereinafter, referred to as a creation unit) 10 and an image input device (hereinafter, input). ), An image output device (hereinafter referred to as an output unit) 14 and a spectrophotometer 16.

The input section 12 is, for example, a scanner, reads an original sample image 20 to be subjected to duplication, and inputs image input data (image input signal value).
Is passed to the creating unit 10 Creation unit 10
Is a central part of the present invention, and is constituted by a computer that performs various processes as described in detail below.
The creating unit 10 converts the image input data received from the input unit 12 into a first conversion table (first three-dimensional lookup table (first 3DLUT)) suitable for the light-sensitive material of the original sample and the observation light source. To a colorimetric value data, and then a second conversion table (second three-dimensional look-up table (second 3DL
UT)) to output image output data (image output signal value)
Convert to Further, the same processing is performed by changing the observation light source to generate a plurality of image output data, and one final image output data is calculated from these by a predetermined function operation and output to the output unit 14. The output unit 14 is, for example, a printer or a film recorder, and uses an output device that outputs to a photosensitive material corresponding to the photosensitive material of the original sample, and outputs the image output data received from the creating unit 10 to a predetermined photosensitive material. Then, a duplication 22 corresponding to the original sample is created.

Here, the conversion table will be described in detail later, but for the second 3DLUT, the chart 24 output from the output unit 14 is measured by the spectrophotometer 16 based on the chart data generated by the generation unit 10. The colorimetric value is calculated from the spectral transmittance data obtained as described above and the light source spectral distribution data prepared in advance, and the colorimetric value is created in correspondence with the output signal of the chart data when the chart 24 is created.
For the first 3DLUT, the chart 24
Is recorded by the scanner of the input unit 12, the recorded data is associated with the output signal of the chart data, and the output signal is associated with the colorimetric value.

As described above, in the present embodiment, the conversion table is created in the creating unit 10, but the present invention is not limited to this. ) May be provided in the system in advance. However, if the data on the film is unknown, it is necessary to actually output to the film, measure and analyze as described above, and create a conversion table.

FIG. 2 is a block diagram showing a schematic configuration of the creating unit 10 in the present embodiment. The creation unit 10 is roughly divided into a portion related to creation of a conversion table (first and second 3DLUTs) and a portion related to creation of a duplication of an original sample image. The parts related to the creation of the conversion table include a chart data creation unit 30, a spectral transmittance data holding unit 32, a colorimetric value data calculating unit 34, a light source spectral distribution data holding unit 36, an output data / colorimetric value conversion table (second 3DLUT) creating section 38, chart scanner recording data holding section 40, and scanner data / colorimetric value conversion table (first 3DLUT) creating section 42.
The part related to the duplication creation includes an image scanner recording data holding unit (image input signal value holding unit) 4.
4. An image colorimetric data converter 46, an observation light source spectral distribution data storage 48, and an image output data converter 50.

Hereinafter, the operation of the present embodiment will be described. First, a conversion table (first and second 3DLUs)
The method of creating T) will be described. First, the second 3D
The creation of the LUT will be described, which shows the relationship between the colorimetric value and the output signal. First, prepare chart data for creating a lookup table. The output unit 14 is a film recorder, and the chart data creation unit 30 of the creation unit 10 outputs R,
Combination FR (i, j, k) of representative values of G and B output signals
Create the chart data (output signal) composed of
Here, i, j, k = 1, 2,..., N. That is, FR (i, j, k) is an N × N × N 3DLUT
Corresponding to the grid data of Chart data (output signal)
FR (i, j, k) is an output unit (film recorder) 1
4, the data is output to a plurality of reversal films assumed for input and output, and a chart 24 is created.

The charts 24 on the plurality of reversal films just created are measured by the spectrophotometer 16,
The spectral transmittance data D (f, i, j, k, wl) is obtained. Here, the suffix f indicates the type of the film, and wl indicates the wavelength. The wavelength is usually 380 to 780 nm, and is spaced at intervals of 5 or 10 nm. Spectral transmittance data D (f,
i, j, k, wl) are sent to the spectral transmittance data holding unit 32 of the creating unit 10.

Next, in the colorimetric value data calculating section 34,
From the spectral transmittance data D (i, j, k, wl) and the observation light source spectral distribution data L (l, wl) prepared in advance in the light source spectral distribution data holding unit 36, CIE1976L ^* a ^* b
^* Or colorimetric value C such as CIE1976L ^* u ^* v ^*
(L, f, i, j, k) is calculated. Here, l
(L) indicates the type of light source.

Next, the output data / colorimetric value conversion table creation section 38 outputs the R, G, B output signals FR (i, j, k) of the film recorder of the chart data creation section 30.
And the colorimetric value C (l,
f, i, j, k) and an output data / colorimetric value data conversion table (No. 1) indicating the relationship C (l, f, i, j, k) ← → FR (i, j, k). Second 3DLUT). The second conversion table forms a database described by a set of a plurality of 3DLUTs using the film type and the observation light source type as parameters.

Next, the creation of the first 3DLUT will be described. This indicates the relationship between input image data and colorimetric values. To create the first 3DLUT,
The chart 24 is recorded by the image recording scanner of the input unit 12, and the chart scanner recording data S (f, i, j,
k) is sent to the chart scanner recording data holding unit 40.

Then, in the scanner data / colorimetric value conversion table creating section 42, the output signals FR (i, j, k) of the R, G, B chart data of the film recorder created by the chart data creating section 30 and , Relationship with chart scanner recording data S (f, i, j, k) in chart scanner recording data holding unit 40 (conversion table) S (f, i, j, k) ← → FR (i, j, k) First. Next, the relationship between the output signal FR (i, j, k) and the colorimetric value C (l, l, expressed in the database of the output data / colorimetric value data conversion table obtained above.
f, i, j, k), and FR (i, j, k) ← → C (l, f, i, j, k), the chart scanner recorded data S (f, i, j, k)
k) and the colorimetric values C (l, f, i, j, k) are associated with each other,
Relation, S (f, i, j, k) ← → C (l, f, i, j,
k), a scanner data / colorimetric value data conversion table (first 3DLUT) is created.

This first 3DLUT is also a first 3DLUT.
Similarly to the above, the film type and the observation light source type are used as parameters.
A database described by a set of a plurality of 3DLUTs is formed. Further, this conversion table is directly obtained by S (f, i,
j (k) and C (l, f, i, j, k) are not related to each other, and S (f, i,
j, k) ← → FR (i, j, k) ← → C (l, f, i,
j, k).

Next, a method of actually creating a duplication and outputting an image will be described. The original sample image 20 recorded by the scanner of the input section 12 First, the image scanner From data _{SI (f i, i, j} , k) to be. Here, f _i is a recording film type. Image scanner From data _{SI (f i, i, j} , k) is creating section 1
0 is sent to the image scanner recording data holding unit 44.

Next, when the film type of the original sample and the observation light source are specified, the image colorimetric value data conversion unit 46 refers to the data of the observation light source spectral distribution data holding unit 48 and scans the scanner data / colorimetric value data. From the database of the conversion table (first 3DLUT), a scanner data / colorimetric value data conversion table that meets the conditions for the specified observation light source is selected. Then, the image colorimetric value data conversion unit 46 refers to the selected scanner data / colorimetric value data conversion table, and
Converting _{(f i, i, j,} k) to the colorimetric value data CI (l). Here, l is the type of light source.

Next, when a film type and an observation light source of an output film which is excellent in a film recorder such as a color reproduction area and a flare resistance are designated, the image output data conversion unit 50 transmits the data of the observation light source spectral distribution data holding unit 48. And the output data / colorimetric value data conversion table (second 3
DLUT), an output data / colorimetric value data conversion table that meets the conditions is selected. Then, the image output data conversion unit 50 refers to the selected output data / colorimetric value data conversion table and converts the colorimetric value data CI (l) of the image obtained above into a film recorder or a film type. It is converted into image output data (image output signal) FR (i, j, k) according to the output environment.

After the original sample image 20 is recorded by the scanner, the film type and the observation light source are designated, the recorded image is converted into colorimetric values, and further converted into output data by referring to a conversion table. The process is repeated while changing the observation light source type, and a plurality of image output data suitable for each light source type is created.

Then, finally, a predetermined function operation is performed on each of the plurality of image output data for each pixel to calculate one image output data. Although this function operation is not particularly limited, for example, a weighted average for each light source is preferably exemplified. In other words, by weighting according to the ratio used among several observation light sources,
Perform colorimetric reproduction. Then, the finally obtained image output data is output from the output unit 14 to create a duplication (copy).

Hereinafter, specific embodiments will be described.

As an example, the film is Kodak EPR as an input film, Fujichrome "Digital Output Film" (DOF) from Fuji Photo Film as an output film, and the observation light source (light source spectral distribution) is , CIED50, CIED65 and Toshiba color evaluation fluorescent lamps were used. The scanner used was SG1000 manufactured by Dainippon Screen, the printer used was PHISUL2 manufactured by Fuji Photo Film Co., and the spectrophotometer used was TC1800 manufactured by Tokyo Denshoku Co., Ltd. The patch specification is 9 × 9 × 9 colors, and the size of one patch is 3 × 3.
mm, and the final output data was calculated by the (simple) average of the image data obtained for the above three types of light source data.

With the above settings, the processing described above is performed, and as a result of comparison with the conventional method, the reproduced color difference of the 24 colors of the Macbeth chart is 1.8 in the conventional method and 1.8 in the CIED50 in the conventional method. 1.9 and 1.7 for the fluorescent lamp for color evaluation, which is about 1.9.
9, 0.9 for CIED65 and 0.9 for the fluorescent lamp for color evaluation, which was about 0.9. Thus, in the present embodiment, digital duplication with excellent color reproduction accuracy was realized for the above-mentioned observation light source.

In the above embodiment, the duplication of a reversal film for digital output has been described. However, the present invention can be applied to the duplication of a general reversal film or a general transmissive photographic light-sensitive material such as a transmissive display light-sensitive material. Can be applied, and an excellent effect can be obtained. Furthermore, with regard to general photographic materials, the case where a photo (print) image is read by a scanner and a duplicate image is output on the same photographic material is widely included in the concept of duplication. Is not a transmitted light but a reflected light, and the same processing as described above can be performed on these image data to create a duplicate having excellent color reproducibility.

Although the method and apparatus for preparing a colorimetric reproduction duplication according to the present invention have been described in detail above, the present invention is not limited to the above examples, and various improvements can be made without departing from the gist of the present invention. Of course, changes may be made.

[0035]

As described above, according to the present invention, it is possible to realize digital duplication which is suitable for an environment where a user views a duplicate film and which has excellent color reproduction accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically illustrating a duplication system including a colorimetric reproduction duplication creation device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a creation unit of FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 creation unit (duplication creation device) 12 input unit (image input device) 14 output unit (image output device) 16 spectrophotometer 20 original sample image 22 duplicate image 24 chart 30 chart data creation unit 32 spectral transmittance data Holder 34 Colorimetric value data calculator 36 Chart data generator 38 Output data / colorimeter conversion table generator 40 Chart scanner recording data holder 42 Scanner data / colorimeter conversion table generator 44 Image scanner recording data holder 46 image colorimetric value data conversion unit 48 observation light source spectral distribution data holding unit 50 image output data conversion unit

Continued on the front page F term (reference) 2G020 AA08 DA12 DA15 DA32 DA42 2H106 AA62 AB04 BA01 BA35 BA47 2H110 AC02 AC14 BA13 BA16 CB35 CE02 DA00 5C077 LL19 MP08 PP32 PP36 PP37 PQ23 5C079 HB01 HB09 JA25 LB01 MA04 NA03 PA08

Claims (7)

[Claims] An image input signal value of an object of duplication is recorded, and spectral distribution data of a plurality of various light sources, image input signal values, and a colorimetric value under a predetermined light source are recorded with respect to the image input signal value. Using a first conversion table indicating the relationship between the colorimetric values under a plurality of various light sources, a second conversion table indicating the relationship between the colorimetric values under a predetermined light source and the image output signal value is calculated. Using, to convert the colorimetric values under the various light sources into image output signal values for obtaining a photographic material that matches the object, from a plurality of image output signal values obtained for the various light sources, A method for producing a colorimetric reproduction duplication, comprising: obtaining one image output signal value by a predetermined calculation; and outputting the image output signal value to a photographic material matching the object according to the image output signal value. 2. For the second conversion table, output a chart for creating a conversion table, measure the chart with a predetermined light source, and perform colorimetry under a predetermined light source using light source spectral distribution data prepared in advance. Calculating the values, creating the second conversion table from the relationship between the colorimetric values and the image output signal values when outputting the chart, and for the first conversion table, image recording the chart. Then, an image input signal value is obtained and made to correspond to an image output signal value of the chart, and the second conversion table is used to obtain the first input signal value from the relationship between the image input signal value and the colorimetric value. 2. The method for creating a colorimetric reproduction duplication according to claim 1, wherein said conversion table is created. 3. The colorimetric reproduction duplication creation method according to claim 1, wherein the first and second conversion tables are obtained by externally providing a table created in advance. 4. The method for producing a colorimetric reproduction duplication according to claim 1, wherein said predetermined calculation is a weighted average of said plurality of image output signal values. 5. The method according to claim 1, wherein said photographic material is a transmission type photographic material. 6. A method for producing a colorimetric reproduction duplication according to claim 1, wherein said photographic material is a digital output photosensitive material. 7. An image input signal value holding unit for holding an image input signal value obtained by recording from an object of duplication, and holding an observation light source spectral distribution data for holding observation light source spectral distribution data measured in advance. A first conversion table indicating a relationship between the image input signal value and the colorimetric value under the predetermined light source, and a relationship between the colorimetric value under the predetermined light source and the image output signal value. A second conversion table, referring to the observation light source spectral distribution data, and using the first conversion table, converting the image input signal values into colorimetric values under various light sources; A conversion unit, using the second conversion table, converts the colorimetric values under the various light sources into image output signal values, performs a predetermined operation on the image output signal values for the various light sources, Image output data transformation to calculate data Colorimetric reproduction dupe Create Publication apparatus characterized by comprising: a part, the.