摘要:
A radiation-sensitive element for half tone color proofing adapted to be exposed by scanning with four independently modulated sources of radiation emitting at different wavelengths within the range 550 to 900 nm, the element comprising a substrate bearing at least four separate imaging media coated thereon, said imaging media including:(1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing,(2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing,(3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing, and(4) an imaging medium capable of forming a black or a balancing black image upon imagewise exposure and processing,each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum sensitivity of the other imaging media such that after exposure and processing super-imposed yellow, magenta, cyan and black or balancing black images are formed, each image being attributable to the imagewise exposure of the respective source. Three layer elements of forming yellow, magenta and cyan images may be used for preparing half-tone full color images. Exposure apparatus comprising at least three independently modulated sources, preferably semiconductor sources emitting in the region of 550 to 900 nm may be used for imaging.
摘要:
A process for producing a continuous tone color image comprising providing a light sensitive photographic element comprising a substrate bearing three imaging media coated thereon, said imaging media comprising:(1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing,(2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing,(3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing,each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum spectral sensitivity of the other imaging media within the range 550 to 900 nm, the sensitivities at the wavelength of maximum spectral sensitivity of the media decreasing in order from the medium of shortest wavelength maximum spectral sensitivity to the medium of longest wavelength maximum spectral sensitivity, the difference in said sensitivities between the media of shortest and longest wavelength maximum spectral sensitivity being greater than 0.8 log exposure units, exposing said element to three independently modulated sources each emitting radiation of a wavelength in the region of the wavelength of maximum sensitivity of a respective imaging medium, the maximum emission intensities of the sources at the wavelength of their maximum output increasing from the source of shortest wavelength to longest wavelength by an amount corresponding to the sensitivity difference of the imaging media, said exposures being conducted in scanning fashion and over a number of discrete exposure levels.
摘要:
A radiation-sensitive element for half tone color proofing adapted to be exposed by scanning with four independently modulated sources of radiation emitting at different wavelengths within the range 550 to 900 nm, the element comprising a substrate bearing at least four separate imaging media coated thereon, said imaging media including:(1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing,(2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing,(3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing, and(4) an imaging medium capable of forming a black or a balancing black image upon imagewise exposure and processing,each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum sensitivity of the other imaging media such that after exposure and processing super-imposed yellow, magenta, cyan and black or balancing black images are formed, each image being attributable to the imagewise exposure of the respective source. Three layer elements of forming yellow, magenta and cyan images may be used for preparing half-tone full color images. Exposure apparatus comprising at least three independently modulated sources, preferably semi conductor sources emitting in the region of 550 to 900 nm may be used for imaging.
摘要:
An imaging process which comprises the steps of:(i) providing a first radiation sensitive element comprising a transparent base having coated thereon at least three imaging media each capable of forming a color image upon imagewise exposure and processing, each of said imaging media capable of forming a color image having a maximum sensitivity at a wavelength different from the wavelengths of the maximum sensitivity of the other imaging media capable of forming a color image and the wavelength of the maximum absorption of the color image formed by each imaging medium differing from the wavelength of the maximum absorption of the color image formed by the other imaging media by at least 40 nm;(ii) obtaining color separation information representative of the cyan, magneta and yellow and optionally black content of a color original, or electronically generated image,(iii) exposing said first radiation sensitive element of step (i) to at least three independently modulated sources of radiation, each source being modulated by said color separation information with respect to one color and emitting radiation at a wavelength in the region of the wavelength of maximum sensitivity of one of said imaging media capable of forming a color image such that a latent image representative of at least the cyan, magneta and yellow information of step (ii) is formed in individual color forming media;(iv) processing said exposed radiation sensitive element to produce a transparency comprising at least three color images, a first color image being representative of the color separation information for cyan, a second color image being representative of the color separation information for magenta and a third color image being representative of the color separation information for yellow,(v) exposing a second radiation sensitive element comprising a base having at least one imaging medium coated thereon through said transparency produced in step (iv) to record on said second radiation sensitive element an image corresponding to one or more of the images of said imaging media of the transparency.
摘要:
An imaging process which comprises the steps of:(i) providing a first radiation sensitive element comprising a transparent base having coated thereon at least three imaging media each capable of forming a color image upon imagewise exposure and processing, each media having a maximum sensitivity at a wavelength different from of the other imaging media and the wavelength of the maximum absorption of the color image formed by each imaging medium differing from the other imaging media by at least 40 nm;(ii) obtaining color separation information representative of the cyan, magenta and yellow and optionally black content of a color original, or electronically generated image,(iii) exposing said first radiation sensitive element of step (i) to at least three independently modulated sources of radiation, such that a latent image representative of at least the cyan, magenta and yellow information of step (ii) is formed in individual color forming media;(iv) processing said exposed radiation sensitive element to produce a transparency comprising at least three color images,(v) exposing a second radiation sensitive element comprising a base having at least one imaging medium coated thereon through said transparency produced in step (iv) to record an image corresponding to one or more of the images of the transparency.