EP0016234B1 - Procédé de contrôle visuel de la qualité de reproduction d'imprimés obtenus par composition au moyen d'un tube à rayons cathodiques - Google Patents

Procédé de contrôle visuel de la qualité de reproduction d'imprimés obtenus par composition au moyen d'un tube à rayons cathodiques Download PDF

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Publication number
EP0016234B1
EP0016234B1 EP19780101472 EP78101472A EP0016234B1 EP 0016234 B1 EP0016234 B1 EP 0016234B1 EP 19780101472 EP19780101472 EP 19780101472 EP 78101472 A EP78101472 A EP 78101472A EP 0016234 B1 EP0016234 B1 EP 0016234B1
Authority
EP
European Patent Office
Prior art keywords
elements
normal
cathode ray
area
ray tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19780101472
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German (de)
English (en)
Other versions
EP0016234A1 (fr
Inventor
Christof Kehl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Ing Rudolf Hell GmbH
Original Assignee
Dr Ing Rudolf Hell GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Ing Rudolf Hell GmbH filed Critical Dr Ing Rudolf Hell GmbH
Priority to EP19780101472 priority Critical patent/EP0016234B1/fr
Priority to DE7878101472T priority patent/DE2862298D1/de
Publication of EP0016234A1 publication Critical patent/EP0016234A1/fr
Application granted granted Critical
Publication of EP0016234B1 publication Critical patent/EP0016234B1/fr
Expired legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/02—Sensitometric processes, e.g. determining sensitivity, colour sensitivity, gradation, graininess, density; Making sensitometric wedges

Definitions

  • the invention relates to a field of reproduction technology, namely to the visual control of the reproduction quality of printed products which are produced by means of cathode ray photo sets.
  • a change in the weight of the lines manifests itself in the fact that individual lines or entire text groups appear bolder or leaner than the surrounding text. This is perceived as unattractive by graphic specialists and also by non-specialists, since it makes the overall appearance of a printed matter appear restless and unkempt. In addition, the legibility of such a text is reduced, since the reader believes that when he finds a bold line, he will find an intended emphasis on the text.
  • the blackening or density on photo paper should be so high that there is such a high contrast between the drawing elements and the paper white that it enables a photographic recording on a graphic film.
  • Line thickness change and density are two characteristics that run largely parallel, which means that a change in the line thickness can also be expected to change the density.
  • the measuring microscopic method a microscope is used, which is equipped with an eyepiece screw micrometer. After finding a suitable measuring point, the line width can be read on the scale division in the eyepiece.
  • this method is subject to a certain degree of uncertainty when determining the effective line thickness.
  • the degree of coverage of a grid field exposed on the photo setting machine is measured in order to control the change in line thickness. If the individual points or lines of the grid widen, the area coverage increases, the field appears darker, and a higher measured value can be determined with the densitometer.
  • microdensitometric Method the density is continuously scanned across the entire width of the line to be measured with a measuring gap opening of 0.5 to 5 ⁇ and recorded as a function of the location coordinate on a writing instrument connected for this purpose. The line thickness and the density can then be measured or read from the recorded density profile.
  • DE-AS-2401 672 describes control strips for assessing the image quality, with the aid of which a change in density and line thickness can also be determined.
  • measuring elements are provided which have recesses which grow overexposed and then look like a normal grid point. In the case of underexposure, the recesses become larger, the total area coverage decreases, which is why such elements are also called negative elements.
  • measuring elements are provided which have small satellite-like points outside the normal raster point (normal element), which disappear in the case of underexposure and increase in the event of overexposure and thus increase more than the normal element in the total area coverage. These elements are also called positive elements.
  • control strip is evaluated densitometrically.
  • the present invention is therefore based on the object of specifying a simple method for visually checking the reproduction quality of printed products which are generated by means of cathode ray photo sets.
  • Fig. 1 shows a field in the lower area of which the word "underexposed” can be seen.
  • the entire field consists of three types of surface elements, which differ in their behavior with underexposure, normal or overexposure.
  • the special circumstances of the exposure area in question and the known normal, negative and positive elements were used.
  • the different behavior of these three elements is explained by the fact that there are latent reinforcements in the positive element and latent weak points in the negative element. These places can be called latent because their effectiveness is almost non-existent in the normal range.
  • the normal element changes only slightly within the entire processing area.
  • the positive element changes in the negative area very similar to the normal element, but shows a clear tendency in the positive area to enlarge its area.
  • the negative element also changes in the positive area very similarly to the normal element, but shows a clear tendency in the negative area to reduce its area.
  • Fig. 1 the basic structure of the field consists of normal elements.
  • the white center line in which the term "underexposed” appears, there are negative elements where the writing is.
  • positive elements are arranged in the form of the lettering “Overexposed”, which is not visible in FIG. 1, but this is clearly expressed in FIG. 3.
  • Fig. 2 shows the case of normal exposure, in which all three types of elements are reproduced approximately the same and appear as a homogeneous surface, i.e. the exposure is optimally adjusted.
  • Fig. 3 shows the case of overexposure.
  • the negative elements below the center line are depicted like normal elements, but the positive elements grow more strongly in terms of their area coverage, as a result of which they appear strongly contrary to FIGS. 1 and 2.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Claims (4)

1. Procédé pour le contrôle visuel de la qualité de reproduction de résultats d'impression, obtenus à l'aide d'un ensemble photographique à rayon cathodique, caractérisé en ce que des éléments négatifs normaux et positifs connus en soi sont combinés à l'intérieur d'un champ de contrôle en des symboles ou en des mots de façon que la personne assurant le contrôle puisse directement reconnaître une zone de traitement non acceptable.
2. Procédé selon la revendication 1, caractérisé en ce que les éléments négatifs et normaux sont combinés dans un champ partiel pour permettre la reconnaissance d'un trop faible éclairage ou d'un trop faible développement.
3. Procédé selon la revendication 1, caractérisé en ce que les éléments positifs et normaux sont combinés dans un champ partiel pour rendre reconnaissable un éclairage trop intense ou un développement trop fort.
4. Procédé selon les revendications 2 et 3, caractérisé en ce que les éléments sont combinés de façon à permettre la reconnaissance des mots «sous exposés» ou «surexposés».
EP19780101472 1978-11-29 1978-11-29 Procédé de contrôle visuel de la qualité de reproduction d'imprimés obtenus par composition au moyen d'un tube à rayons cathodiques Expired EP0016234B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19780101472 EP0016234B1 (fr) 1978-11-29 1978-11-29 Procédé de contrôle visuel de la qualité de reproduction d'imprimés obtenus par composition au moyen d'un tube à rayons cathodiques
DE7878101472T DE2862298D1 (en) 1978-11-29 1978-11-29 Method for visually testing the reproduction quality of printed matter obtained by cathode ray tube composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19780101472 EP0016234B1 (fr) 1978-11-29 1978-11-29 Procédé de contrôle visuel de la qualité de reproduction d'imprimés obtenus par composition au moyen d'un tube à rayons cathodiques

Publications (2)

Publication Number Publication Date
EP0016234A1 EP0016234A1 (fr) 1980-10-01
EP0016234B1 true EP0016234B1 (fr) 1983-07-20

Family

ID=8185942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780101472 Expired EP0016234B1 (fr) 1978-11-29 1978-11-29 Procédé de contrôle visuel de la qualité de reproduction d'imprimés obtenus par composition au moyen d'un tube à rayons cathodiques

Country Status (2)

Country Link
EP (1) EP0016234B1 (fr)
DE (1) DE2862298D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715363A1 (de) * 1987-05-08 1988-11-24 Jens Rauch Kopiergeraet mit bestueckung einer computeransteuerbaren kopierfaehigen anzeigeeinheit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH554751A (de) * 1973-03-08 1974-10-15 Brunner Felix Vorrichtung zur kontrolle der bildqualitaet eines in einem reproduktionsverfahren zu verarbeitenden bildes.
US4004923A (en) * 1973-11-02 1977-01-25 American Hoechst Corporation Method of using a test film to measure developer activity
US3998639A (en) * 1974-11-19 1976-12-21 Bell Telephone Laboratories, Incorporated Methods for determining feature-size accuracy of circuit patterns
US4183659A (en) * 1977-06-30 1980-01-15 Felix Brunner Means for controlling the change of thickness of lines of photographically produced briefs producible by the agency of a means for photographic reproduction

Also Published As

Publication number Publication date
EP0016234A1 (fr) 1980-10-01
DE2862298D1 (en) 1983-08-25

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