JP2614046B2 - Photo printing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic printing apparatus that performs exposure based on image information of a baked photographic paper when photographic paper is reprinted.

(Prior art)

Generally, in a photographic printing apparatus, photographic printing paper is irradiated with a transparent light of a light source transmitted from an original film through a lens unit. In a printing apparatus applied when printing color prints, light from a light source reaches an original film through a light control filter including complementary color filters of yellow (Y), magenta (M), and cyan (C). It has become.

Here, an image density sensor composed of an optical sensor such as a photo diode is disposed between the original film and the lens unit so that image density information of the original film can be detected.

The image density information is sent to an exposure controller, and the exposure amount of each color is calculated by the following equation, so that a photographic printing process can be performed with an optimal exposure amount suitable for the original film. This is based on the well-known Evans theorem.

l _og E _i = l _og E _Ni + C _j (D _Nj −D _NNj ) (1) where, E: exposure amount of the original film E _N : exposure amount of the standard original film C: correction coefficient based on the density of the original film D _N: original film of LATD D _NN: standard original film LATD i: red, green, any color j of the blue: Y, M, one of the colors of C by the way, simultaneous printing in such a photographic printing apparatus Although there is no problem at the initial stage as in the above, if the customer re-orders for additional printing etc. and performs the printing process based on the LATD of the original film, the same printing Even if a developing machine is used, the finish at the time of simultaneous printing may be different due to a change in a light source or a developing solution, which is one of the claims. In particular, in the case of an original film having a biased color, the operator makes a visual judgment and corrects the mixed subjectivity, so that the same correction is not necessarily made at the time of reordering, and similar claims have been made.

For this reason, the present applicant has proposed to adjust the density at the time of reprinting based on the photographic paper printed by the original film at the time of reprinting to make the finished condition the same as the original photographic paper. I have. In this case, it is preferable to detect the density of the image printed on the photographic paper. The light from the light source is reflected by the photographic paper, the density of the reflected light is detected, and based on the information, the expression (1) is used. The obtained exposure amount is corrected.

By the way, when positioning the image exposure of the original film to the exposure position, an identification code corresponding to the exposure number of the corresponding image exposure is attached to the baked photographic paper, and the worker stores the identification code after storing the identification code. The original film is transported and positioned depending on the memory.

[Problems to be solved by the invention]

However, as described above, if the image exposure of the original film is positioned at the exposure position depending on the memory of the worker, a different image exposure may be positioned at the exposure position, and an image different from that of the pre-printed photographic paper may be obtained. It will be burned out.

An object of the present invention is to provide a photographic printing apparatus capable of accurately and quickly positioning an image exposure corresponding to a pre-printed photographic paper to an exposure position in consideration of the above fact.

[Means for solving the problem]

A photographic printing apparatus according to the present invention includes an original film to which an exposure number is assigned corresponding to each of continuous original image exposures, and a printing process performed by the original film and an identification code corresponding to the exposure number is previously assigned. And a holding device for holding a print divided for each printing image exposure, and the same light source that irradiates the transmitted light transmitted through the original film and the reflected light reflected by the print to obtain the reflected light, An exposure number reading device for reading the exposure number of each original image exposure of the original film, an original image exposure density measurement device for measuring the density of the original image exposure, and a print density measurement for measuring the density of the printed image exposure of the print A device, an identification code reading device for reading the identification code of the print, and an original image exposure having an exposure number corresponding to the identification code read from the print, conveyed to an exposure position. And a printing device for printing the original image exposure on photographic paper so as to obtain the same color as the finished state of the print based on the density of the original image exposure and the density of the print image exposure of the print. Have.

[Action]

The photographic printing apparatus according to the present invention has a holding device, and the holding device is an original film to which an exposure number is assigned corresponding to each of the continuous original image exposures, and a printing process is performed by the original film, and the exposure process is performed. Holds the print to which the identification code corresponding to the number is given. This print is preprinted photographic paper in which the original image exposure of the original film has been printed. The identification code corresponds to the exposure number of the original image exposure, and is attached to a part of the printing paper at or before or after the printing process. The identification code is read by the identification code reading device, and the exposure number of the original film is read by the exposure number reading device. The transport device transports the original image exposure to which the exposure number corresponding to the identification code read from the print is attached to the exposure position. Thus, the original image exposure corresponding to the print held by the holding device can be positioned at the exposure position.

The positioning of the original image exposure may be performed by detecting the edge of the image, or may be performed by detecting the notch in a notched negative film. Alternatively, the first exposure may be set in the carrier, and this may be performed by feeding a fixed amount. Further, this may be performed in combination.

The light source for illuminating the original film and print is
The same light source is used to obtain transmitted light transmitted through the original film and reflected light reflected by the print. The density of the original image exposure is measured by an original image exposure density measuring device, and the density of a print image exposure is measured by a print density measuring device. The printing means
The original image exposure is printed on photographic paper based on the density of the printed image exposure so as to obtain the same color tone as the finished print.

As described above, according to the present invention, the original image exposure corresponding to the print can be conveyed to the exposure position to perform the optimal exposure correction, and the original image film and the print can be illuminated by the same light source so that the original image is exposed. Since the density of the exposure and the density of the printed image exposure of the print that has already been printed well are measured, the exposure amount can be determined by using the density of the printed image exposure and the density of the original image exposure of the original film. The same color can be obtained.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an outline of an example of a photographic printing apparatus 10 in which light emitted from a light source 12 is irradiated via a light diffusion tube 14 onto a negative film 18 as an original film arranged on a carrier 16. Photographic paper 22 through the lens unit 20
The structure is to be baked.

Between the light source 12 and the light diffusion tube 14, a light control filter 24 composed of three complementary color filters of yellow (Y), magenta (M) and cyan (C) is interposed. The dimming filter 24 is controlled by signals from the exposure controller 26 via drivers 28, 30, and 32, respectively. Normally, colors that become unnecessary in the white light exposure process are converted into Y, M, C colors. The colors are reduced by each of the filters.

A density sensor 34 for detecting image density information of three primary colors of red (R), green (G) and blue (B) is provided between the negative film 18 and the lens unit 20. . The density sensor 34 is constituted by a group of optical sensors such as photodiodes, and supplies a density distribution information signal of the negative film 18 transmitted by the light source 12 to the exposure controller 26 via the amplifier 36.

The exposure controller 26 adjusts the amounts of the three color components of the YMC to determine a correction coefficient so as to be gray based on the well-known Evans's theorem, and calculates the exposure amount E _i according to the equation (1).
Is controlling.

That is, the by E _i inserting each dimmer filter 24 from which the energization of the solenoid 40 (exposure start) after sequential exposure amount is sufficient to configure the shutter 38 in the optical path, to terminate the exposure of the color, The entire exposure time is controlled.

On the carrier 16 on which the negative film 18 is disposed, a photographic paper disposing portion 44 for disposing the photographic paper 42 which has already been printed is formed, and the disposing portion of the photographic paper 42 which has already been printed by the negative film 18 is formed. Have been.

An opening 46 is provided in the printing surface of the photographic paper 42 of the photographic paper placement unit 44, and is opposed to the light source 12 through an optical system such as a mirror 48, whereby a light beam irradiated on the negative film 18 is provided. And the light beam applied to the photographic paper 42 changes in the same manner. The optical system such as a mirror 48 disposed between the light source 12 and the printing paper 42 may use another optical system such as a lens unit depending on the location of the light source 12, and the light source 12 may be directly connected to the negative film 18 and the negative film 18. It is not always necessary if the photographic paper 42 can be irradiated.

A density sensor 50 having the same configuration as that of the above-described density sensor 34 is disposed between the mirror 48 and the printing paper disposition portion 44 of the carrier 16, and is irradiated with light from the light source 12 (in this embodiment, Fig. 1 Photographic paper 4 reflected by a light source 12A) indicated by an imaginary line
The density of the baked surface 2 is detected. This density is preferably an average value of the density of the entire image.

The density information signal detected by the density sensor 50 is
It is supplied to the exposure controller 26 via 52. The bottom surface 54 of the photographic paper placement unit 44 is gray,
The printing paper is transferred to the printing paper placement unit 44 during the printing process of the negative film 18.
In the case where 42 is not arranged, the same density information signal as in the state where no correction is required in the Evans' theorem is supplied to the exposure controller 26.

The exposure controller 26 has a CPU 5 as shown in FIG.
6 (central processing unit), RAM 58 (random access memory), ROM 60 (read only memory), and a bus 62 such as a data bus or control bus connecting these.

The output signals of the amplifiers 36 and 52 are A / D (analog /
The signal is supplied to an input / output port 66 via a (digital) converter 64, and based on these signals, a signal is supplied from the input / output port 66 to the solenoid 40 and the drivers 28, 30, 32.

The following expression based on the expression (1) is stored in the ROM 60.

l _og E _i = l _og E _Ni + C _j (D _Nj −D _NNj ) + γ _j (D _Pj −D _NPj )
.. (2) where γ: correction coefficient based on photographic paper density D _P : photographic paper density D _NP : standard photographic paper density Based on this equation (2), the CPU 56 determines the exposure amount E for each color.
_i (where i is red, green and blue) is calculated, and the exposure time and the operation time of each light control filter 24 are calculated.

 Next, the carrier 16 will be described in detail.

As shown in FIG. 3, the carrier 16 comprises a base 70 and a lid 72.
And one side of each long side is connected by a hinge 74, and the main surfaces can be separated from each other. A limit switch 75 is attached to the base 70 so that the open / closed state of the lid 72 can be detected. The signal line of the limit switch 75 is connected to the exposure controller 26.

On the front side of the base 70 in FIG. 3, two protruding portions 76 and 78 extending in parallel with the long sides are integrally formed, and between them, the guide passages 80 for both ends in the width direction of the negative film 18 are provided. It has been. Thus, when the negative film 18 is moved in the longitudinal direction (the direction of the arrow A in FIG. 3), it is surely moved linearly.

A rectangular through hole 82 corresponding to one exposure of the negative film 18 is provided at a longitudinally intermediate portion of the guide passage 80, and the negative film 18 receives light from the light source 12 therefrom. .

The cover 72 is provided with a through-hole 86 corresponding to the through-hole 82 so that the light transmitted through the negative film 18 is applied to the lens unit 20.

A substantially U-shaped frame 88 is attached below the through-hole 86 in FIG. As shown in FIG. 4, the frame 88 has a substantially L-shaped cross section perpendicular to the axis, so that the photographic paper 42 can be inserted and held. The base body 70 has this frame 88
The opening 46 is provided corresponding to the portion surrounded by, as shown in FIG. 1 in a state where the lid 72 is closed,
The printing surface of the printing paper 42 is configured to face the mirror 48.

That is, a predetermined exposure of the negative film 18 is
When transporting to the position 86, the terminal of the photographic paper 42 well printed by this exposure is inserted into the frame 88 in advance, so that the density information of the photographic paper 42 can be obtained when the negative film 18 is exposed. I can do it.

As shown in FIG. 3, a negative film transport device is provided upstream and downstream of the carrier 16, respectively.
Winding rollers 90 and 92 for winding the longitudinal ends of the 18 in layers are arranged. Take-up rollers 90 and 92 are exposure controllers
The negative film 18 is rotated by the driving force of a driving circuit 93 (see FIG. 2) driven in accordance with a signal from 26, and transports the negative film 18 in the direction of arrow A in FIG. That is, when a driving force is applied to the downstream winding roller 90, the negative film 18 is transported in the direction of arrow A, and when a driving force is applied to the upstream winding roller 92, the negative film 18 is transported in the direction opposite to the arrow A. Will be. In this case, the braking force of a brake mechanism (not shown) acts on the winding roller to which the driving force is not applied, and the negative film 18 is conveyed while being applied with a substantially constant tension. When the negative film 18 is set on the carrier 16, an arbitrary image exposure is manually set to an exposure position (through hole 8).
It is necessary to position to 2, 86). After the positioning is completed, the transport of the negative film 18 by the winding rollers 90 and 92 is an exposure feeding in which the image exposure pitch is a unit feeding amount.

A well-known bar code reader 94 is disposed upstream of the carrier 16 and is attached to one end of the negative film 18 in the width direction. The bar code reader 94 reads a bar code 96 (FIG. 5 (A)) and searches for an image exposure to be positioned at an exposure position. The bar code 96 is attached to the negative film 18 in advance to make it easy to read the exposure number corresponding to each image exposure of the negative film 18. That is, it is applied because it is easier to identify and cheaper than a reading device that directly identifies an exposure number (numeral).

Here, as shown in FIG. 5 (A) (viewed from the arrow V in FIG. 1), the bar code 96 attached to the negative film 18 has a predetermined interval near the right side of the corresponding exposure number (FIG. 5 ( It is given the dimension B) of A). The bar code 96 is read by the bar code reader 94 while the negative film 18 is being conveyed.After the reading, the negative film 18 is temporarily stopped and then the negative film 18 is removed by an integral multiple of the image exposure pitch. It is designed to be transported. This dimension is determined by how many frames upstream from the exposure position the search by the barcode reader 94 is performed. In this embodiment, as shown in FIG. Since it is located between the eyes and the third frame, it is designed to carry two frames after the search is completed.

As shown in FIG. 4, the cover 72 of the carrier 16 is provided with a through-hole 98 corresponding to the back surface of the baked photographic paper 42 inserted and held therein. Bar code 42A as the identified identification code (see FIG. 5 (B))
Is to be exposed. The bar code 42A corresponds to the exposure number of the image exposure printed on the pre-printed photographic paper 42, and is applied to a search or the like for the image exposure at the time of reprinting or the like. The bar code reader 99 is mounted on the through hole 98. The bar code reader 99 reads the bar code 42A exposed from the through-hole 98 by moving its own detection unit (not shown), and has a configuration different from the bar code reader 94. I have. The data Bp (electric signal corresponding to the bar code 42A) read by the bar code reader 99 is sent to the exposure controller 26. The exposure controller 26 temporarily stores the data Bp in the RAM 58. The stored data Bp is negative film 18.
Each time a bar code 96 (data Bf) attached to
The bar code is collated, the driving of the winding rollers 90 and 92 is controlled, and the negative film 18 is conveyed in the direction of the arrow A or the direction of the opposite arrow A in FIG. It has become.

As shown in FIG. 1, a bar code printing machine 95 is provided on the back side of the photographic paper 22 to be printed, and is controlled by a signal from the exposure controller 26 via a drive circuit 97. It has become. This barcode printing machine
Numeral 95 prints the same bar code as the bar code 42A attached to the baked photographic paper 42 in conjunction with the conveyance of the photographic paper 22 after the printing. In this embodiment, since the printing machine 95 is installed one frame downstream of the photographic paper 22,
The image is printed with a delay.

The printing procedure of the photographic printing apparatus 10 configured as described above will be described below with reference to the flowchart of FIG. It is assumed that the light source 12 is already energized and irradiated with light.

First, in step 100, the negative film 18 is arranged on the carrier 16, an arbitrary exposure is selected, this exposure is made to correspond to the through-hole 82, and positioning to the exposure position is performed. When the positioning is completed, the operator then inserts the pre-printed photographic paper 42 into the frame 88 and places it on the photographic paper placement unit 44. After the above preparation steps are completed, the cover 72 of the carrier 16 is hinged. The base 70 and the lid 72 are closed by rotating about the support shaft 74. The closed state of the base 70 and the lid 72 is detected by the limit switch 75, and the process proceeds to step 102.
In step 102, the barcode attached to the baked photographic paper 42 is read by the barcode reader 99, and the data is read.
Bp is supplied to the exposure controller 26 and stored in the RAM 58. In the next step 103, a driving force is applied to the winding roller 90 on the downstream side to convey the negative film 18 by one image exposure.
Since a braking force is applied to the upstream take-up roller 92 during this transfer, the negative film 18 is guided by the projections 76 and 78 of the carrier 16 at both ends in the width direction while maintaining a substantially constant tension. Therefore, it is moved linearly without meandering. At the time of this exposure, negative film 1
The barcode 96 attached to 8 is read by the barcode reader 94, and the data Bf is supplied to the exposure controller 26. At step 105, data Bp corresponding to the barcode of the baked photographic paper 42 stored in the RAM 58 is taken into the CPU 56, and at step 106 these data Bp are read.
p and Bf are compared. Since these data Bp and Bf are processed as numerical values, the magnitude relation therebetween can be determined. Therefore, if the barcode of the baked photographic paper 42 matches the barcode read from the negative film 18 (Bp = Bf), it can be determined that the image exposure corresponds to the baked photographic paper 42. In step 107, after the film is conveyed by two frames by the downstream take-up roller 90 in step 107,
Move to. As a result, the exposed printing paper 42
Can be positioned.

If it is determined at step 106 that Bp> Bf, it is determined that the transport of the negative film 18 is insufficient, and
At 108, a driving force is applied to the downstream winding roller 90 to convey the negative film 18 by one exposure in the direction of arrow A in FIG.
After shifting to 4, these data Bp and Bf can be matched by repeating steps 105 and 106 below.

Next, when it is determined in step 106 that Bp <Bf, it is determined that the transport of the negative film 18 is excessive, and step 10 is performed.
9 and apply a driving force to the upstream winding roller 92.
The negative film 18 is conveyed by one frame in the direction opposite to the arrow in FIG. Thereby, the data Bp and Bf can be made to coincide with each other in the same manner as described above.

In step 110, the negative film 1 is detected by the density sensor 34.
The density of the exposure is detected by the light from the light source 12 that has passed through 8. At the same time, the light source 12 irradiates the photographic paper 42 via the mirror 48. This light beam is reflected by the printing paper 42, and the density of the image printed on the printing paper 42 is detected by the density sensor 50.

That is, the negative film 18 and the photographic paper 42
Is detected, there is no influence of the lamp fluctuation which occurs when the density is measured with a different light source, and the power for energizing the light source can be reduced.

Here, the densities of the negative film 18 and the photographic paper 42 detected by the density sensors 34 and 50 are average values of the entire image, but may be only one point of an important part. If the photographic paper 42 is not placed in the photographic paper placement section 44, the photographic paper placement section 44
Since the bottom surface 54 is grayed in advance, the density detected by the density sensor 50 is substantially equal to the density of the standard photographic paper.

In step 111, based on each density detected in step 110, the exposure amount of each color is calculated by the above equation (2). When the photographic paper 42 is not placed as described above, the same operation as in the above equation (1) is performed.

Next, the exposure amount of each color obtained in step 111 is converted into an exposure time, and sorted in ascending order of exposure time in step 112, and then the shutter 38 is opened in step 113 (energization of the solenoid 40). Thus, the transmitted light of the predetermined exposure of the negative film 18 reaches the photographic paper 22 via the lens unit 20, and the exposure is started.

In step 114, each light control filter 24 is operated for a predetermined period of time, and cuts are performed in order from the color for which exposure has been completed. When exposure for all colors has been completed, the process proceeds to step 116, and the shutter 38 is closed. This will be described later.

In the next step 117, the photographic paper 22 is conveyed by one image, and at the same time, the bar code 42 of the baked photographic paper 42 which was placed on the carrier 16 when the photographic paper 95 was printed once before by the printing machine 95.
Print the same barcode as A. When printing is completed, in step 118, the bar code data Bp of the burned photographic paper 42 currently arranged on the carrier 16 is substituted into Bp-1.

Next, when the operator releases the carrier 16 in step 119, this is detected by the limit switch 75, and the printing process is terminated. Here, if another original film or another exposure and photographic paper are set on the carrier 16 and the carrier 16 is closed, the printing process is continued.

Next, the subroutine of step 114 will be described in detail with reference to FIG.

The dimming filters 24 are rearranged in step 110 in ascending order of exposure time. For example, yellow (filter F1), magenta (filter F2), and cyan (filter)
In the order of F3), first, at step 122, it is determined whether or not the yellow exposure time has ended. When it is determined that the yellow exposure time has ended, a signal is sent from the exposure controller 26 to the driver 28 at step 124, and the filter F1 is turned off. Insert into the optical path. Next, when it is determined in step 126 that the magenta exposure time has ended, the driver 30 is operated in step 128, and the filter F2 is inserted into the optical path. Step 130
If it is determined that the exposure time for cyan, which is the longest exposure time, has expired, the driver 32 is operated in step 132 to insert the filter F3 into the optical path, and the process returns to the main routine. As described above, since each of the light control filters is controlled in consideration of not only the density of the negative film 18 but also the density of the already printed good photographic paper 42, the photographic paper and the photographic paper 42 which have been reprinted are printed.
(For example, photographic paper at the time of simultaneous printing).

Further, since the light source 12 is shared by the negative film 18 and the photographic paper 42, there is no variation in chromaticity or the like, and the cost can be reduced as compared with the case where separate light sources are provided.

Further, since the negative film 18 and the corresponding pre-printed photographic paper 42 can be arranged as a pair on the carrier 16, the collation work thereof can be facilitated.

In this embodiment, the negative film is transported for each exposure,
Although Bp and Bf are successively compared, steps 104 to 110 shown in FIG. 5 may be controlled as shown in FIG.

That is, the difference D (Bp-Bf) between the data Bf of the image exposure read in step 104A and the data Bp of the printed photographic paper 42 stored in the RAM 58 in step 105A is calculated in step 106A, and the difference is calculated in step 107A. If the difference D is a positive number or 0, the image exposure is transported in the direction of arrow A in FIG. 3 by D + 2 exposures in step 108A, and if the difference D is a negative number in step 107A, D-2 is applied in step 109A. The image is conveyed in the direction indicated by the arrow A in FIG. In this manner, the search for the image exposure can be completed by one comparison of the data Bp and Bf.

As described above, in the present embodiment, a corresponding image exposure is automatically searched from a plurality of image exposures recorded on the negative film 18 based on the barcode attached to the pre-printed photographic paper 42 and positioned at the exposure position. Therefore, workability is improved, and work errors such as correcting the exposure amount with different compositions are eliminated. In addition, since the barcode attached to the already-printed photographic paper 42 can be attached to the photographic paper that has been reprinted, the collation becomes easy even at the time of the next reprint.

〔The invention's effect〕

As described above, the photographic printing apparatus according to the present invention includes the density of the baked image exposure of a print in which an identification code corresponding to the exposure number of the original image exposure of the original film to be searched held in the holding device is added in advance. Since the same light source is used to detect the density of the original image exposure of the original film corresponding to the print image exposure of the print, the original image is obtained so that the image information of the obtained original film matches the image information of the print. The original image exposure of the original film can be printed on photographic paper based on the density of the original image exposure of the film and the density of the image exposure of the print to obtain a print having the same color tone as the finished state of the print. Has excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic structural view of a photographic printing apparatus according to the present invention, and FIG.
FIG. 3 is a control block diagram, FIG. 3 is a perspective view of the carrier, and FIG.
FIG. 5 is a cross-sectional view taken along the line IV-IV of FIG. 3, FIG. 5 (A) is an explanatory view taken along the line V of FIG. 1 showing positioning of the negative film, and FIG. FIG. 6 is a perspective view showing a bar code, FIG. 6 is a control flowchart according to the present embodiment, and FIG.
FIG. 8 is an exposure control subroutine, and FIG. 8 is a flowchart showing a part of control according to another embodiment. 10 Photographic printing device, 12 Light source, 16 Carrier, 18 Negative film, 24 Dimming filter, 26 Exposure controller, 34, 50 Density sensor, 42 Print printing Paper, 44 ... Print paper placement section, 90, 92 ... Take-up rollers, 94, 99 ... Bar code reader.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiko Saeki 798 Miyadai, Kaisei-cho, Ashigara-gun, Kanagawa Prefecture Fuji Photo Film Co., Ltd. (56) References JP-A-62-42138 (JP, A) JP-A-56-128933 (JP, A) JP-A-60-249139 (JP, A)

Claims (2)

(57) [Claims] 1. An original film to which an exposure number is assigned corresponding to each of continuous original image exposures, and a printing process performed by the original film and an identification code corresponding to the exposure number is given in advance. A holding device for holding prints divided for each printing image exposure, the same light source for irradiating the transmitted light transmitted through the original film and the reflected light reflected by the print to obtain the reflected light, An exposure number reading device that reads an exposure number of each original image exposure; an original image exposure density measurement device that measures the density of the original image exposure; a print density measurement device that measures the density of a printed image exposure of the print; An identification code reading device that reads an identification code of a print, and a transport device that transports an original image exposure with an exposure number corresponding to the identification code read from the print to an exposure position, Printing means for printing the original image exposure on photographic paper so as to obtain the same color as the finished state of the print based on the density of the original image exposure and the density of the print image exposure of the print. . 2. A printing apparatus according to claim 1, wherein said printing device is provided with an identification code printing machine, and prints the same identification code as the print held by said holding device on said printed photographic paper. The photographic printing apparatus according to claim 1.