Abstract: Digital image signal data is applied to a film recorder to produce a pseudo-negative using high gamma transparency film as the negative. The image signal data is modified before application to the film recorder to insert signal values, positive for positive transparency film and negative for negative transparency film, such that upon photographic processing of the transparency film, a negative image is produced with a positive orange mask effect. The pseudo-negative is then used to produce multiple positive print images conventional negative-working print paper.

Abstract: A system for bit-masked color signal scaling comprises a processing unit, a display device, and a memory wherein a scaling unit, an image memory, a multiplication image memory, an approximation image memory, an approximation multiplication image memory, and a scaled image memory reside. The scaling unit retrieves a color signal having a red channel signal, a green channel signal, and a blue channel signal from the image memory, and performs either an exact or an approximate bit-masked color signal scaling. A method for exact bit-masked color signal scaling comprises the steps of: generating a staggered masking signal; generating a center masking signal; generating a staggered result signal; generating a center result signal; and adding the staggered result signal and the center result signal to produce a scaled color signal.

Abstract: In a color correcting method for use in a color image forming apparatus, color image data are calculated and then corrected by solving a masking equation by allotting the tone number of input image data according to the value of each coefficient of reflection density of each of three primary colors in the masking equation.

Abstract: Apparatus, and associated methods employed therein, for objectively providing an accurate appearance match between two depictions of a common images produced by two imaging systems (e.g. a target image (170) produced by one such system (160), e.g. a press sheet (178) generated by a printing press (168), which is to be matched by a replica image (150) produced by another such system (140), e.g. a proof (153) generated by a direct digital color halftone proofing system (143)) and thereby calibrate the performance of one imaging system, e.g. the proofing system, to that of the other system, e.g. the printing press. Specifically, measurement data, such as illustratively colorimetric CIELAB L*a*b* measurements, is obtained for the same portions of the press sheet and proof. This data is acquired in or transformed into a color space which encodes color information in a pre-defined manner that approximates human color perception. Thereafter, through use of a pre-determined model of the, e.g.

Abstract: A overlapping device of a color video printer for overlapping arbitrary two-field video signals on a single screen is disclosed. In this device, one field video signal between the selected two-field video signals is used with its original density and the video signal corresponding to the other field is used as a background screen by controlling the color density of the video signal by changing the digital value of the video signal by the shift register, thereby giving a perspective representation.

Abstract: A method is provided which sharpens three-dimensional images by using an unsharp masking technique subsequent to interleaving and before printing.