Title:
EXPOSURE ADJUSTMENT
Document Type and Number:
Japanese Patent JPS5593147
Kind Code:
A
Abstract:
From color density triplets, obtained by the photoelectric point by point scanning of a negative, there are formed an integral density value, a mean density value and a maximum density parameter which are combined by linear combination to form a basic density correction value which modulates the overall density of copies to be produced from the negative. The negative is subdivided into concentric zones, and the more centrally located zones are given a greater weight than the outer zones when the integral density values and the maximum density parameter are being formed. A threshold value is formed and the negative is checked for areas of density greater than the threshold extending up to the margin, and the density values of image points included in such areas are reduced by a certain fraction. Additionally, there may also be evaluated and utilized the difference between the maximum density value in the outermost zone of the negative and a mean density value for use as distinguishing feature to further correct for the presence of exposures taken by flash, against the sun or taken of snow scenes.
Inventors:
KAARU URUSUPURUNGU
FURANTSU TSUIMUMERUMAN
FURANTSU TSUIMUMERUMAN
Application Number:
JP13475179A
Publication Date:
July 15, 1980
Filing Date:
October 20, 1979
Export Citation:
Assignee:
GRETAG AG
International Classes:
G03B27/73; G03B27/80; (IPC1-7): G03B27/72
Domestic Patent References:
| JPS5428131A | 1979-03-02 |