Apparatus for determining image areas for printing

Details Apparatus for determining image areas for printing Apparatus for determining image areas for printing

1978-06-07

1980-07-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

356444, G01N 2130

Patent

active

042108187

ABSTRACT:
Apparatus for analyzing an image member such as a photographic film bearing an image to be printed and providing information as to the image area. The information may be utilized in determining initial ink key settings for a printing cylinder on which the image is to be printed. The image member is positioned on a support surface and a scanner assembly including a light source and light sensors scans the surface. Light transmission readings are taken from calibration film strips on the support surface and at positions on the support surface corresponding to the locations of the ink key columns of the printing cylinder. The data are calibrated and normalized using the calibration readings. The data are also corrected for the number of layers in the image member. Data from ink key columns which will not be utilized in printing the image analyzed are discarded. A procedure is provided for removing the effect on the data of any non-image material on the image member.

REFERENCES:
patent: 3741664 (1973-06-01), Torin
patent: 3790275 (1974-02-01), Huboi et al.
patent: 3853409 (1974-12-01), Gaillochet
patent: 3958509 (1976-05-01), Murray et al.
patent: 4100424 (1978-07-01), Akimoto et al.

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