Method and circuit arrangement for partial electronic retouch in

Details Method and circuit arrangement for partial electronic retouch in Method and circuit arrangement for partial electronic retouch in

1982-05-04

1984-10-09

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 78, G03F 308, H04N 146

Patent

active

044764871

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to electronic reproduction technology, particularly to the production of corrected and retouched color separations by means of an electronic image processing system (retouch station).


UNDERLYING PRIOR ART

In electronic color reproduction, three primary measured color value signals which represent the color components red, green and blue of the scanned image points are gained in a color scanner by means of opto-electronic scanning of a master. A color correction computer corrects the measured color value signals and generates the color separation signals therefrom which are required for the production of the color separations, said color separation signals being a measure for the amounts of printing ink required in the later print.
The color separation signals are digitized and are deposited in a storage medium image point-wise as digital color values. The stored color values of various individual masters can be combined according to a layout plan in an image processing system to form the data set of an overall page and/or, on the other hand, subsequent, partial retouches (corrections of color value and/or tint value) can be carried out by means of changing the color values. Partial retouches, i.e., retouches limited to selectable, topically limited image areas, are necessary in order to optimize the correction carried out in the color computer or, on the other hand, in order to take subsequent editorial changes and clients' desires into consideration. These retouches, for example, are a matter of creating highlights by means of lightening, of working out shadow passages by means of darkening, or a matter of improving the delineation by means of brightening and darkening, whereby a gradual (bleeding) effect, i.e., a gradually increasing or decreasing effect, is often to be achieved.
In order to record the retouch color separations, the changed color values are read out of the storage medium, are converted back into analog color separation signals and are supplied to a color scanner in which the rastered or unrastered color separations "yellow", "cyan", "magenta" and "black" for the production of printing forms are exposed.
A method for partial electronic retouch has already been proposed in the German patent application No. P 29 20 058.6 (international patent application No. PCT/DE 80/00070) in which the digital color values are altered partially and image point-wise under visual control on a monitor in accord with the desired retouch effect in the color image or in the color separation, being altered by means of image point-dependent correction values. The image point coordinates of the color values to be retouched and the desired degree of retouch are determined by the retoucher, in that he conducts the coordinate pen of a coordinate identification device over the image part to be retouched like a retouch brush, whereby the coordinate pen contacts the corresponding image points and the degree of retouch for the individual image points is derived from the plurality of contactings. In order to be able to more quickly retouch larger image parts, the correction area and, thus, the plurality of image points covered and retouched with each contact of the coordinate pen is increased, this corresponding to an enlargement of the "brush surface".
This procedure with the coordinate pen as a "electronic retouch brush" specified in the German patent application No. P 29 20 058.6 indeed allows any type of progressions to be achieved but requires a great deal of care and is particularly time-consuming when the progressions are meant to be smooth without perceptible gradation.


DISCLOSURE OF THE INVENTION

It is therefore the object of the present invention to specify a method and a circuit arrangement for partial electronic retouch in color image reproduction which improves the proposed method in such manner that gradual retouch changes and color progressions can be executed more simply and in a shorter time.
Given the present invention, this object is achieved in that the indi

REFERENCES:
patent: 3848856 (1974-11-01), Reeber et al.
patent: 3972066 (1976-07-01), Seki et al.
patent: 4060829 (1977-11-01), Sakamoto
patent: 4204223 (1980-05-01), Gast et al.
patent: 4236174 (1980-11-01), Gall

Affiliated with

Also associated with

Rating

Method and circuit arrangement for partial electronic retouch in does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and circuit arrangement for partial electronic retouch in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and circuit arrangement for partial electronic retouch in will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1604015