JPS5936221B2 - Color correction amount calculation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color correction amount calculation device used when obtaining a color print from a color film in, for example, color photography.

Normally, in order to obtain a color print from a color negative, it is necessary to perform at least three exposures using a color filter.

The selection of exposure and printing conditions, selection of color filters, and determination of exposure time require a considerable amount of heat and experience. For example, in extreme cases, there may be a request for a color negative photograph of an autumn landscape and a print of a summer landscape.

In such cases, the filter used when printing negatives should be
Since it is necessary to select a non-standard filter, conventionally the above-mentioned hot wire technicians have selected appropriate filters and conditions through trial and error based on their long experience and intuition. The present invention has been made in view of the above problems, and it is an object of the present invention to provide a color correction amount calculation device that allows even an amateur to easily select printing conditions.

An embodiment of the present invention shown in FIG. 1 will be explained below.

The system shown in FIG. 1 is premised on the use of a color TV camera or a device that displays an image scanned by a color scanner or the like on a color TV monitor. Furthermore, the system shown in Fig. 1 displays the standard color, which should be the standard for color correction, as a color bar along with the image on a color TV monitor, and also displays the standard color as a spot in the color area that requires color correction. The purpose is to know the amount of correction by comparing it with the color.

It is difficult for the human eye to discern the absolute chromaticity difference when there is a distance between the color bar and the color to be corrected. However, the ability to compare color differences between adjacent colors is very good. Therefore, the amount of correction is known by moving the standard color spot to the position of the color to be corrected and comparing the color difference between the two with the human eye. In Figure 1, 1 is a video input terminal, 2
is a synchronization signal input terminal, 3 is an output terminal, 4 is a video circuit,
Amplifies the video signal from a color TV camera (not shown) or a color scanner (not shown), etc. input from terminal 1,
The image is sent to a color TV monitor 6 through a mixing circuit 5 and displayed on the color TV monitor 6. The mixing circuit 5 is a circuit that mixes color bar signals and spot signals, which will be described later, and sends the mixture to the color TV monitor 6. Reference numeral 1 denotes a synchronization circuit which drives the color TV monitor 6 and at the same time supplies signals to the color bar display position setting circuit 8 and the spot position control circuit 10, and is used to set respective display position addresses.

8 is a color par display position setting circuit, for example, as shown in FIG. 2, the standard colors A, B,
. . . A standard color par 32 consisting of H, etc. is displayed.

33 in FIG. 2 is a display spot. 9 is a standard color par generation circuit, and 10 is a spot position control circuit, which controls the position of the standard color spot.

Movement of the spot position is effected by a joy stick 11 or the like connected to the circuit.
A spot size control circuit 12 controls the display size of a spot located at an arbitrary position.

The display size must not be much smaller than the area of the color to be corrected. A spot color selection circuit 13 selects a standard color to be compared.

14 is an adjustment circuit that adjusts the display color of the spot.

Furthermore, since the displayed color is configured to pass through this adjustment circuit, it is only necessary to compare it with the color to be corrected on the color TV monitor 6 and adjust it so that it becomes the same color. The adjustment amount at this time is stored as a correction amount in the correction amount storage circuit 15 together with the color name. The above operations are performed not only for one color but for several colors, and the corrected data is sent from the output terminal 3 to a processing device (not shown), which calculates and selects the optimal filter and performs proper exposure. Calculate the amount.

As described above, according to the present invention, the amount of correction can be determined by simply matching the colors while comparing and contrasting the color of the point of interest with the standard color, and this correction amount data can be sent to the processing device. Since the optimum filter is determined by this method, anyone can easily obtain high-quality prints without the need for skill or intuition as in the past.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of image display in the embodiment of FIG. In the figure, 1 is a video input terminal, 2 is a synchronization signal input terminal, 3 is an output terminal, 4 is a video circuit, 5 is a mixing circuit, and 6 is a color C
RT17 is a synchronization circuit, 8 is a color par display position setting circuit, 9 is a standard color par generation circuit, 10 is a spot position control circuit, 11 is a joy stick, 12 is a spot size control circuit, 13 is a spot color selection circuit, 14 15 is an adjustment circuit, 15 is a correction amount storage circuit, 31 is an image display screen, 3
2, the color par 33 is a display spot.

Claims (1)

[Claims] 1. A first display means for displaying an image of a color film on a color television monitor, a display spot of a standard color to be compared with the color to be corrected in the image and a color bar of this standard color, at a predetermined location on the color television monitor. a second display circuit for displaying the image at the position of the color bar; a color bar generation circuit for generating a standard color bar signal; a color selection circuit for manually selecting the color of the color bar to be displayed at the display spot; A color correction amount calculation device comprising: an adjustment circuit that manually adjusts the color displayed on the display spot; and a storage circuit that stores the adjustment amount adjusted by the adjustment circuit.