JPH04145426A - Electrophotographic printing method - Google Patents

Abstract

PURPOSE:To partially correct in an easily method and to efficiently reproduce an image for a short time by using a controller partially controlling the transmitting light quantity of a micro electronic shutter and a photographic printer composed of a computer specifying the position of the micro electronic shutter. CONSTITUTION:The image of an original film 1 is photographed by a video camera 12 via an enlarging lens 2, and a mirror shutter 3, and displayed on the display 14 of a personal computer 15 through a convertor 13. When an exposure is started by an instruction from the personal computer 15, a motor 7 is rotated by an exposure control system 18, three-color resolving filters 6 are rotated, and one of them is inserted into an optical path. On the other hand, a partially dodging mask or a printing mask is formed with position data stored in the personal computer 15 in advance and exposure correcting data, on a micro mosaic electronic shutter 9, and the light quantity of a specified part is corrected. Simultaneously, the mirror shutter 3 is released, and the exposure to a sensitized material 4 is started. The exposing times of respective single colors of R, G, and B are determined by the instruction from the personal computer 15, and when the exposures for three colors are sequentially finished, the mirror shutter 3 is closed and the exposure is completed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention performs dodging, burning, color correction, etc. on a portion of the original film when duplicating a positive color film, for example. The present invention relates to a method for printing photographs.

[Prior Art] A conventional photographic printing apparatus faithfully projects and prints an image from an original film onto a photosensitive material. For this reason, in cases where the image quality of the original film is poor due to insufficient or excessive light on the subject during shooting, or certain color reflections, it is necessary to perform work such as dodging and burning in a darkroom during printing. be done.

This process differs depending on the condition of each original film, is difficult, requires skill, has poor reproducibility, and is low in productivity, so it is avoided.

On the other hand, it is also possible to import the original film as image data using a scanner, process it on a computer, perform partial dodging and color correction, and then expose it, but this increases equipment costs and takes time to process. The actual situation is that the processing cost is high and its use is limited to applications other than plate making and printing.

Furthermore, there is a method of using a cathode ray tube (braun tube) as a light source and exposing by flying spots or raster on a phosphor screen, but due to the amount of emitted light, the exposure time becomes long and productivity is low.

[Problems to be Solved by the Invention] The present invention provides a method for printing a part of an image on an original film when it is not suitable for printing faithfully as it is due to insufficient or excessive light intensity in a part of the subject at the time of shooting, or reflection of a specific color. To provide a photo printing method for efficiently reproducing images in a short period of time by adding corrections in a simple manner.

[Structure of the Invention] The photographic printing method of the present invention includes an optical device that projects an image of an original film onto a photosensitive material, a light source system that forms a real image of a micro-mosaic electronic shutter near the original film, and a micro-electronic shutter. The above problem was solved by performing partial dodging, burning, and color correction of the original film using a photographic printing device consisting of a control device that partially controls the amount of transmitted light and a computer that defines its position.

[Example] FIG. 1 is an explanatory diagram showing an example of the basic configuration of an additive sequential exposure color photographic printing apparatus used in the method of the present invention.

Red, green, and blue filters are set in the windows of the three-color separation filter disk 6, and in the standby state, the windows without filters are in the optical path.

There is a diffuser plate 5 very close to the original film 1;
A real image of the electronic shutter 9 is projected by a lens 8 onto the screen. The image on the original film 1 is captured by an enlarger lens 2,
It is photographed by a video camera 12 via a mirror shutter 3, and displayed on a display 14 of a personal computer 15 via a converter 13. If the original film is a negative image, it is also possible to display it as a positive image on the display using a negative/positive inversion circuit (not shown). For the image on the display 14, a digitizer 16 connected to the computer 15 can specify the XY position data and exposure correction amount on the minute mosaic electronic shutter 9, such as dodging areas, burn-in areas, color correction areas, etc. This information is stored.

Further, the exposure time for each unit of R, G, and B is also calculated and stored.

When exposure is started in accordance with an instruction from the personal computer 15, the exposure control system 18 turns the motor 7 to rotate the three-color separation filter 6, and one of the three-color separation filters enters the optical path. Furthermore, a dodging mask or a burn-in mask is partially formed on the micro-mosaic electronic shutter 9 based on the position data and exposure amount correction data stored in advance in the personal computer 15, and the light amount of the designated portion is corrected.

At the same time, the mirror shutter 3 opens and the roll-shaped photosensitive material 4 is opened.
Start exposure to light.

The exposure time for each unit of R-G and B is determined by instructions from the computer 15, and when the sequential exposure of the three colors is completed, the mirror shutter 3 is closed to complete the exposure, and the three-color separation filter disk 6 is placed on standby. Return to state - complete the cycle.

The micro mosaic electronic shutter referred to here is, for example, T
It can be constructed using a PT active matrix transmission type liquid crystal element or the like.

Furthermore, a halogen lamp, a metal halide lamp, or the like can be used as the light source lamp. In the above printer configuration, the position of the real image of the micro mosaic electronic shutter 9 is as follows:
FIG. 2 shows a color photograph of the white light subtractive exposure method used in the method of the present invention, which is preferably placed very close to the original film 1 and preferably in a position where the image is not formed on the photosensitive material 4 by the enlarging lens 2. FIG. 1 is an explanatory diagram showing an example of the basic configuration of a printing device.

The light from the light source lamp 11 is transferred to the dichroic mirror 22.2.
5, the light is separated into the three primary color lights of RG and B, and minute mosaic electronic shutters 27, 28, and 31 are arranged in each optical path. Micro mosaic electronic shutter 27.28
．． The light transmitted through the dichroic mirror 29.3
3 and mirrors 23, 32 on the same axis, and a lens 8 forms an image of the micro mosaic electronic shutters 27, 28, 31 in the vicinity of the original film 1.

The micro mosaic electronic shutters 27, 28, 31 are controlled by the electronic shutter control system 17, and the amount of exposure to the photosensitive material 4 is controlled by the time it takes for the three primary color cut filters 34 to enter the optical path.

The exposure method is not limited to the internal light subtractive exposure method described here, but may also be an additive color simultaneous exposure method (not shown) in which a shutter or a diaphragm is installed in the three primary color optical paths of the light source system.

Dodge on the micro mosaic electronic shutter 27.28.31. The method of forming the burn-in mask is the same as that shown in FIG.

In the example shown in Figure 2, although the light source system is complicated, it is possible to determine the position data and correction amount while checking the mask effect on the display, and the exposure time is shortened, which improves work efficiency. There are great advantages to doing so.

[Effects of the Invention] According to the configuration of the present invention, the image on the original film is not exposed as it is, but if necessary, inconvenient areas due to insufficient or excessive light intensity or reflection of a specific color during shooting can be removed in advance. It is possible to specify and expose the area by arbitrarily adjusting the exposure amount and color balance, and as a result, more natural-looking prints can be easily created in a bright room without requiring any skill. Moreover, by recording exposure amount and color balance data and using it repeatedly, reproducibility and productivity are improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of the basic configuration of an additive sequential exposure color photographic printing apparatus used in the method of the present invention, and FIG. 1 is an explanatory diagram illustrating an example of the basic configuration of a subtractive color exposure type color photographic printing apparatus; FIG. 1...-Original film, 2-...-Enlarger lens 3...Mirror shutter 4...
...Photosensitive material 6...Three color separation filter, 8
・・・－・・・Lens 9・・・Minute mosaic electronic shutter Figure 1 The procedural amendment submitted on February 1, 1991 was not accepted, so it was resubmitted.

Claims (1)

[Claims] An optical device that projects an image of an original film onto a photosensitive material, a light source system that forms a real image of a micro-mosaic electronic shutter near the original film, a control device that partially controls the amount of light transmitted through the micro-electronic shutter, and A photo printing method characterized by comprising a computer defining a position.