Cover: Pseudo-Color Processing of Electronic Photographs

Pseudo-Color Processing of Electronic Photographs

Published 1967

by Carl Gazley, J. E. Rieber, R. H. Stratton


Download eBook for Free

FormatFile SizeNotes
PDF file 0.4 MB

Use Adobe Acrobat Reader version 10 or higher for the best experience.


Purchase Print Copy

 Format Price
Add to Cart Paperback29 pages $20.00

A method of using a computer-driven graphical plotter to transform a black-and-white photograph from shades of gray to shades of color corresponding to the relative intensity. The human eye can distinguish thousands of colors, but only about 15 shades of gray. This method of enhancing visibility is applied to the JPL Mariner IV photographic system test tapes of a relief map. The digital output of the camera system consists of 200 lines of 200 elements each. Each element is coded with two octal digits representing its intensity, from 0 (lightest) to 63 (darkest). By use of the IBM 7044 with Stromberg-Carlson 4020, the tape data are converted to 64 black-and-white frames, one of each intensity level. The 64 frames are then copied onto a single frame of color film, using a different color filter for each, from red for 0 through orange, yellow, green, and blue for 63. The resulting pseudocolor photograph appears on the cover of the April 1967 [Astronautics and Aeronautics]. The internally documented FORTRAN programs and control cards used are appended.

This report is part of the RAND research memorandum series. The Research Memorandum was a product of RAND from 1948 to 1973 that represented working papers meant to report current results of RAND research to appropriate audiences.

This document and trademark(s) contained herein are protected by law. This representation of RAND intellectual property is provided for noncommercial use only. Unauthorized posting of this publication online is prohibited; linking directly to this product page is encouraged. Permission is required from RAND to reproduce, or reuse in another form, any of its research documents for commercial purposes. For information on reprint and reuse permissions, please visit

RAND is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.