JPS58114038A - Deciding method for color original - Google Patents

Abstract

PURPOSE:To detect the color balance and color fogs of color originals easily and to give sure setting information to a color scanner by separating the transmitted or reflected light from the color original to red, green, blue and visual light, and displaying and comparing the four scanning pattern curves obtained according to respective densities simultaneously. CONSTITUTION:The transmitted light obtained by scanning a color original is separated to light of three primary colors and a reference color, and the density frequencies occupying in the original in each density range divided to suitable segments by each light are integrated. The resultant results are displayed simultaneously on a screen as the four cumulative frequency distribution curves of the density values corresponding to the density of said colors. From the resultant cumulative distribution curves of the densities of the four colors, the states of color balances of the respective colors and color fogs in the respective positions are known from the deviation values between the reference light curve V and the curves R, G, B of the other colors in, for example, a highlight part H, a medium contrast part M and/or a shadow part S.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects the color characteristics and deep Jilt' characteristics of color originals and provides an essential tool for setting up a color scanner to enable proper color printing. The present invention relates to a method for detecting color originals. In particular, the present invention relates to a color original detection method suitable for comparing color characteristics ♦ of color originals and determining color fog in color originals.

Recently, when producing color printed matter from color originals, color scanners (IL [child color separation @wrinkle]) that automatically perform color separation, tone, color correction, etc. of the ready-to-print original have come to be used. By introducing a color scanner to a color plate, there are many advantages such as improvement and stabilization of color separation, labor saving in the complicated photopress process, quick and easy image correction, etc. Since each color original has very wrinkled characteristics, in order to operate the scanner and obtain the desired print, the operator must examine the characteristics of each color original, the characteristics of the photosensitive material used, and the past. Scanner settings had to be done based on experience, which required an extremely high level of skill.

This technology eliminates these shortcomings and automatically and quickly calculates information about the density range (DR), separation scene, color correction, sharpness, etc. required for color scanner setup from a color original, making it easier to operate the color scanner. A device that enables the production of desired printed matter using color printing has been developed and proposed as a high-speed color document weight device (Unexamined Japanese Patent Publication @
56-126854, print magazine, 1980 (Vo
j63), pp. 9.3-8).

According to this method, the density of a color original is measured, the density occupied in the original is calculated for each density of each color, and after this is made into a pattern, it is compared with a reference pattern, and each color is calculated in relation to the reference pattern. I'm getting information for the scanner by checking the concentration. In the above-mentioned apparatus, a color document is scanned with transmitted light or reflected light, and is scanned with, for example, red (R), green (G), blue 00. It is decomposed into visual (visual efficiency) (V), etc. and integrated to form a scan pattern curve of the original, which is then displayed on an ORT or compared with a reference pattern curve using a printing method. There is.

However, in this method, when comparing each color with the reference pattern curve, the information becomes a value line, so in reality, the scanning pattern curve obtained once by Nada determination using black and white density or visual (S degree) (V) light and this Only a comparison is made with the corresponding reference pattern curve, and in most cases this is sufficient.

Furthermore, in the above method, since each color is compared with the reference pattern curve, the actual situation is that the color balance and color fog of color originals are not detected.

The present inventor further improved the above-mentioned color document separation device and divided the transmitted light or reflected light from the document into the three primary colors and the reference light.
That is, it is divided into red (R), green (G), blue (II) and visual light (V), and the scanning pattern curves obtained according to the density of blue are simultaneously displayed, and the three primary colors R, G, B are displayed simultaneously.
By comparing pattern *II with the reference light V and the reference light V, the color balance and color fog of the original can be easily detected.
We discovered that it is possible to provide accurate setting information to color scanners and obtain better printed matter.
created the invention.

That is, in the present invention, transparent light or reflected light obtained by scanning a color original over the entire surface or at a certain angle is separated into 5 liter color and reference color light, and the original is divided into 5-lit color and reference color light, and the original is divided into dark f-ranges, which are weighted into appropriate divisions for each pre-excavation. The density frequencies occupied in the color are integrated, and the obtained results are simultaneously displayed as four density cumulative patterns corresponding to the densities of these four colors. The present invention will be described below with reference to embodiments shown in the accompanying drawings, which is a method for determining color originals characterized by comparing the deviation from 0 or less. Note that in this embodiment, 611. Color: red (R), border (G)
, visibility light or visual light (with blue (B) as the reference color)
V) was used.

FIG. 1 is an explanatory diagram showing an embodiment of the W structure of the present invention. A color original 1 is mounted on a scanning table 2 movable in the X-Y directions by a motor 6.4. Note that instead of the above-described horizontal scanning method, a cylindrical scanning method may be used in which the document is wound around a cylinder and rotated by &g1 while moving the cylinder. Light from a light source 5 is focused by an optical system 6 to irradiate amti, and the original is moved in the Y-axis and X-axis directions to scan the entire area of the original. The transmitted light 7 that has passed through the source 1 is transferred to a dichroic mirror 8. *Two filter 9. and receiver 10
The color separation element characteristic curve shown in FIG.
Blue (B) and tan (G) as shown.

The color is separated into four colors having spectral curves of red (l) and visual light (V). The light of each color is then introduced into a logarithmic intensifier 12 to define the color density. The concentration values obtained are stored as analog electrical signals in each sampling-and-hold aI mechanism 13 for a period of time, are switched to one series of signals by the multiplex 14, and are converted into digital quantities by the analog-to-digital converter f#15. is input to the computer 16, the density value is integrated for each channel (color), and 4 is input to OR?17.
The color intensity-vote frequency distribution curve is simultaneously displayed on the screen as a curve as shown in FIG. 6, for example. The display method only needs to be able to distinguish between the four colored curves; for example, it may be displayed on a TV screen as a separate curve for each color, or it may be displayed on a monochromatic TV screen using solid lines, dotted lines, etc. It's okay. In addition, the song was played on a plotter 18 days in response to popular demand.
may be printed.

Although transmitted light is used in the above embodiment, it is of course possible to use reflected light if the document is of a reflective type such as a stamp.

Based on the density cumulative distribution curves of the four colors obtained as shown in FIG. The color balance of each color and the state of color fog in the blue part can be known from the deviation from the color curves at G and B, which can contribute to the setting of the color scanner.

For example, in the case shown in Fig. 3, the R component is on the left side of the overall good range for the 7 curves, indicating that the R component is brighter relative to the visibility, and this color It can be determined that red capri is produced in the thickness and width. This kind of phenomenon can occur, for example, when photographing a sunset scene, using a photographic light beam biased toward red components, or due to inappropriate developing conditions, but except in special cases,
By correcting these deviations, it is possible to expect a better finish as a final printed matter. In particular, as in the present invention, the u! of each color near any density value or H, M, S! It is possible to regularly identify and correct wheat, and it is possible to achieve more precise color balance.

Although the present invention has been described above with respect to the case where a printed matter is printed using a color scanner, the present invention is not limited to this only, and it goes without saying that the present invention can also be used, for example, for color correction when obtaining a color print.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, and Fig. M2 shows the spectral characteristic curves of four colors used in the present invention. Fig. 3 shows the cascade distribution curve obtained by the present invention. It is a graph. In the figure. 1.Color cost 5..Light source 11..Color separation thread 12..Target intensifier 16..Sampling and hold Isakaki 14..Multiplex 15..Analog-digital conversion'fJ/A structure 16. ---
Computer 17-OR? 18... Prozter

Claims (1)

[Scope of Claims] α) Transparent light or reflected light obtained by scanning the entire surface or a certain area of a color original is separated into six colors and reference color light, and each density range is divided into appropriate sections for each pre-excavation. The density ratios occupied in the original are integrated, and the obtained results are simultaneously displayed as four density cumulative patterns corresponding to the densities of these four colors, and the density cumulative patterns corresponding to each of the three primary colors and the density of the reference color are displayed simultaneously. A method for judging color originals, which is characterized by comparing deviations from a cumulative pattern.斡) The method for determining a color original according to claim 1, wherein the deviation of the cumulative pattern is compared at an arbitrary density value. (3) The method for determining a color original according to claim (a), in which the deviation of the cumulative pattern is compared using at least one density value of a highlight portion, an intermediate portion, and a shadow portion. ←) The method for determining a color original according to the patent claim ←), wherein the three primary colors are red, green, and blue, and the reference color is a visual color.