Slide rule-type color chart determines the final reproduced gray tones in the production of briefing charts that are photographed in black and white. The chart shows both the color by drafting paint manufacturers name and mixture number, and the gray tone resulting from black and white photographic reproduction

Griffin, J. D.

English

NASA Technical Reports Server

December 1966	 Brief 66-10680 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Slide Rule-Type Color Chart Predicts Reproduced Photo Tones 
The problem: 
In the production of briefing charts that are photo-
graphed in black and white, it would be advantageous 
to be able to determine the final reproduced gray 
tones in order to achieve a pleasing and effective 
contrast as between superior and subordinate chart 
increments. 
The solution: 
A slide rule-type color chart that shows both the 
color by drafting paint manufacturer's name and 
mixture number, and by the gray tone resulting from 
black and white photographic reproduction. 
How it's done: 
The selection of colors necessary to produce suf-
ficiently contrasting gray tones is made quickly and 
easily by moving the rule slide and visually comparing 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
the various gray tones as they register adjacently. As 
the desired contrast is determined, the appropriate 
color identification by manufacturers' names and hues 
is read from the rule. The names and corresponding 
hues of the various manufacturers appear on the rule 
above and below the various gray tones. 
Notes: 
I. This rule might be useful for commercial artists to 
assist in selecting specific colors to produce desired 
photographic tone contrast. 
2. Inquiries concerning this innovation may be made 
to:
Technology Utilization Officer 
Manned Spacecraft Center 
Houston, Texas 77058 
Reference: B66-10680
(continued overleaf) 
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000678 2020-03-11T17:42:52+00:00Z
Patent status: 
No patent action is contemplated by NASA. 
Source: J. D. Griffin 
of North American Aviation, Inc. 
under contract to 
Manned Spacecraft Center 
(MSC-1227) 
Brief 66-10680	 Category 01


Slide rule-type color chart predicts reproduced photo tones

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