Gerhard Dr Kuhn

TL;DR: In this article, a color copying apparatus having a photoelectric color exposure control device is calibrated by making a copy of a calibrating original, which includes a gray stepped wedge, on a photographic copying material using an exposure determined by the photoelectric camera and assumed to be proper for achieving the desired density values in the developed image of the calibrated original.

TL;DR: In this article, a gray staircase with steps known density gradation and color composition with a frequency determined by the photoelectric exposure control device was used to calibrate a color copying machine with a photoelectric camera.

TL;DR: Verfahren und Vorrichtung zur Eichung eines Farbkopiergerates with foto-elektrischer Belichtungssteuervorrichts (3), wobei eine Grautreppe mit Stufen bekannter Dichteabstufung and Farbzusammensetzung with einer durch die fotoelektorischen Belichungs Steuerervorichtung bestimmten, fur die erforderliche Anderung der Kop

TL;DR: In this article, three secondary electromultipliers furnish electrical currents which vary as a function of the light received by the photosensitive material in each color, which increases the sensitivity of the other electron multipliers, increasing the charging rate of the capacitor, and thus decreasing the exposure time in the other colors.

TL;DR: In this paper, the authors describe an AQUEOUS ALKALINE BATH CONTAINing PER LITER 0.01 to 1.0 GRAM of a black-white developer of the P-AMINOPHENOL or 1-PHENYLPYRAZOLIODINE SERIES.