Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-05-06
1987-09-01
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 78, 358 80, H04N 146, G03F 310
Patent
active
046912290
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a facility for checking or, respectively, for correcting color pictures on a color monitor according to the preamble of patent claim 1.
2. Description of the Prior Art
A color viewing device with which an image to be printed can be displayed, corrected and evaluated is already disclosed by the DE-AS No. 26 07 623 (U.S. Pat. No. 4,285,009). U.S. Pat. No. 4,393,399 corresponds to PCT-OS No. 80/02607 U.S. Pat. Nos. 4,285,009 and 4,393,399 are hereby incorporated by reference. Extensive image corrections can be undertaken with this apparatus and therewith achieved is that the picture displayed on the color monitor and potentially corrected comes as close as possible to the final printing result, i.e. to the picture as it later appears when printed. An objective image evaluation is required for this purpose. This is only possible when the operator, in addition to the more or less subjective visual image impression, has possibilities which allow binding, reproducible statements. Measuring the colors is, for example, such a means. A cursor mixed into the image is thereby moved to the picture detail to be measured and the corresponding color values are read at, for example, a measuring instrument or these color values are mixed in at the margin of the picture. The corresponding printing ink for these color values can then be identified in a color atlas and this reference color is compared to the picture screen. This method is not optimum since it is time-intensive and not reliable in evaluation, for the eye becomes insensitive given a greater distance between the colors to be evaluated or, respectively, compared.
Further, errors can occur due to unfavorable lighting and a colored surround field of the color to be evaluated.
Further known in the evaluation of color pictures is to make reference colors visible on the color monitor at the margin of the picture. This type of evaluation is likewise still faulty since the chromatic impression of the picture element to be evaluated or of the picture detail to be evaluated is influenced by the surrounding colors and there is a distance from the reference color fields.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to specify a facility with which an even better evaluation of the colors in the picture is enabled.
The invention achieves this by means of the features recited in the characterizing part of claim 1. Advantageous improvements are described in the sub-claims 2-4.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention shall be explained in greater detail below with reference to the FIGURES.
Shown therein are:
FIG. 1 a fundamental circuit diagram of the facility;
FIG. 2 an illustration of the directional coordinates that are generated by means of a "trackball";
FIG. 3 an illustration of a reference color field on the monitor screen;
FIG. 4 a circuit for the drive of the RAM control unit;
FIG. 5 a memory fill for the example of FIG. 2;
FIG. 6 an example for the memory of the RAM control unit; and
FIG. 7 a clock pattern for the RAM memory.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
An image repetition memory (1) is provided in FIG. 1, this comprising an image data input via which the printing ink signals of the picture to be displayed which were identified by a scanner in a preceding process have been input. The image scanning by means of such scanners is general prior art. The scanner Type DC 300 of Dr.-Ing. Rudolf Hell GmbH, Kiel, Germany is referenced in this context This scanner has been in worldwide use long before the date of filing, see for example the company publication of Dr.Ing. Rudolf Hell GmbH, "Chromagraph DC 300", No. 300-8-7703 (984) of 1977 or the German Letters Patent No. 21 07 738 or, respectively, the U.S. Pat. No. 3,725,574 which is hereby incorporated by reference. The image signals generated by means of this scanner are digitized into the standard codes employed for the image signals. This coding, however, is not of decisive sig
REFERENCES:
patent: 3725574 (1973-04-01), Gast
patent: 4285009 (1981-08-01), Klopsch
patent: 4393399 (1983-07-01), Gast et al.
patent: 4464677 (1984-08-01), Kuhn et al.
patent: 4476487 (1984-10-01), Klie et al.
patent: 4486772 (1984-12-01), Klie et al.
patent: 4516155 (1985-05-01), Hennig et al.
patent: 4577219 (1986-05-01), Klie et al.
Colditz Armin
Klopsch Siegfried
Dr. -Ing. Rudolf Hell GmbH
Masinick Michael A.
Toth E. Anne
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