Method and apparatus for making positive copies from diapositives
AssigneeAgfa-Gevaert
InventorEduard Wagensonner
Life of this patent
Estimating the term…
Abstract
Diapositives are copied on negative photosensitive paper in an apparatus wherein the positive is electronically scanned, line-by-line, and the thus obtained density signals are electronically inverted prior to influencing the beam of a CRT or laser which is used to reproduce the image of the positive on paper, either line-by-line or point-by-point. The inversion of signals renders it possible to scan the high-transmissivity portions of the positives with a narrow beam, i.e., with a high degree of resolution.
Claims17
A method of making a copy of an original, particularly a positive copy of a diapositive, comprising the steps of photoelectrically scanning the original, line-by-line, to obtain density signals;
- electronically inverting the density signals;
- directing a beam of radiation against a negative photosensitive material;
- and influencing the beam by the inverted density signals.
Apparatus for making a copy of an original, particularly a copy of a diapositive on negative photosensitive material, comprising means for photoelectrically scanning the original, line-by-line, to obtain density signals;
- means for electronically inverting said density signals;
- means for directing a beam of radiation upon negative photosensitive material;
- and means for influencing the beam in accordance with the characteristics of inverted signals.
A method of making a copy of an original having a first region of a first density and a second region of a lower second density, said method comprising the steps of scanning said original to obtain a first density signal for said first region and a second density signal for said second region;
- inverting said density signals;
- directing a beam of radiation against a photosensitive material;
- and controlling the width of said beam by the inverted density signals so that the inverted second density signal results results in a smaller beam width than does the inverted first density signal.
Apparatus for making a copy of an original having a first region of a first density and a second region of a lower second density, said apparatus comprising means for scanning the original to obtain a first density signal for the first region and a second density signal for the second region;
- means for inverting the density signals;
- means for directing a beam of radiation upon photosensitive material;
- and means for controlling the width of the beam by the inverted density signals so that the inverted second density signal results in a smaller beam width than does the inverted first density signal.
Dependencies are inferred from the claim text.