Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984s%26t....67..407s&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 67, May 1984, p. 407-411.
Astronomy and Astrophysics
Astronomy
1
Astronomical Photography, Digital Techniques, Image Processing, Color Photography, Digital Data, Galactic Clusters, High Pass Filters, Image Contrast, Image Enhancement, Spiral Galaxies
Scientific paper
Digital technology has been used to improve enhancement techniques in astronomical image processing. Continuous tone variations in photographs are assigned density number (DN) values which are arranged in an array. DN locations are processed by computer and turned into pixels which form a reconstruction of the original scene on a television monitor. Digitized data can be manipulated to enhance contrast and filter out gross patterns of light and dark which obscure small scale features. Separate black and white frames exposed at different wavelengths can be digitized and processed individually, then recombined to produce a final image in color. Several examples of the use of the technique are provided, including photographs of spiral galaxy M33; four galaxies in Coma Berenices (NGC 4169, 4173, 4174, and 4175); and Stephens Quintet.
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