Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-12-12
1987-05-26
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 80, G03F 308, H04N 146
Patent
active
046689796
ABSTRACT:
In electronic reproduction technology, a method and apparatus for production of color separations from color originals for single color printing. The color original is opto-electronically scanned point-by-point and line-by-line for generating measured color values. Chrominance values are obtained from the measured color values by an adjustable coordinate transformation, and a hue signal is acquired from the chrominance values by quotient formation. A hue control signal is derived from the hue signal, said hue control signal having a maximum value for a selectable separation hue of a color of the scanned original and becoming zero for an adjustable, maximum deviation from the separation hue. During recording of the color separation of a separation hue, the hue control signal is directly employed for controlling the recording element which records the color separation point-by-point and line-by-line. For recording a color separation of a separation color, a color saturation signal and a luminance signal are additionally derived from the measured color value signals, and transformed into a color saturation control signal and a luminance control signal by amplitude and/or non-linear modification. The hue control signal, color saturation control signal, and luminance control signal are combined into the separation signal. The production of color separations for single color printing is significantly improved by the individual setting of the curves of the control signals dependent on hue, color saturation, and luminance on the one hand, and, on the other hand, by a controlled color desaturation.
REFERENCES:
patent: 4194839 (1980-03-01), Knop
patent: 4261011 (1981-04-01), Knop
patent: 4564859 (1986-01-01), Knop et al.
Dr. -Ing. Rudolf Hell GmbH
Groody James J.
Svihla Randall S.
LandOfFree
Production of color separations for single color printing in whi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Production of color separations for single color printing in whi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of color separations for single color printing in whi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-707082