A physically founded analytical representation
of the characteristic curve

Ewald Gerth
Academy of Sciences of the GDR, Central Institute of Astrophysics, Potsdam (GDR)

Abstract
A simple four-parameter formula of the characteristic curve is derived on the basis of the theory of the photographic process, making use of special approximations that allow for elementary integration. The formula is suited for interpolation of the characteristic curve and appropriate for computerized sensitometric evaluation.

P 71. Gerth, E.:
A physically founded analytical representation of the characteristic curve
ASTROPHOTOGRAPHY. Proceedings of the IAU Workshop, Jena, GDR, April 21-24, 1987, p. 83-90.
Ed. S. Marx, Springer-Verlag Berlin Heidelberg New York London Paris Tokyo

SAO/NASA ADS Astronomy Abstract Service

Preceding publications:

P 16. Gerth E.:
Analytische Darstellung der Schwärzungskurve
unter Berücksichtigung des Schwarzschild-Effektes
Z. wiss. Phot. 59 (1965) 1-19
Abstract:
Analytic representation of the photographic characteristic blackening curve
accounting for the Schwarzschild-effect

P 22. Gerth E.:
Zur theoretischen Deutung des Schwarzschildschen Schwaerzungsgesetzes -
mit einer Wuerdigung des Begruenders der Wissenschaftlichen Photographie:
Karl Schwarzschild 1873-1916
Wiss. Z. PH Potsdam 10 (1966) 339-410
Abstract:
On the theoretical interpretation
of Schwarzschild's law of blackening -
with a recognition of the founder of Scientific Photography:
Karl Schwarzschild (1873 - 1916)

P 36. Gerth E.:
Analytische Darstellung der Schwaerzungsfunktion
mit Hilfe von Matrixfunktionen
Annalen der Physik 27 (7) (1971) 126-128
Abstract:
Analytic representation of the photographic
characteristic blackening curve by matrix functions
Abstract HTML-Version
Quoted by: SAO/NASA ADS Physics Abstract Service

P 51. Gerth, E.:
Zur Theorie der photographischen Schwaerzungsfunktion.
Bild und Ton 31 (1978) 357-363
Abstract:
On the theory of the photographic characteristic function

Following publications:

P 79. Gerth, E.:
Derivation of a four-parameter density formula
of the photographic characteristic curve
J. Inf. Rec. Mater. 18 (1990) 3, 161-173
Abstract:
Derivation of a four-parameter density formula
of the photographic characteristic curve


www.ewald-gerth.de/71abs.htm