Abstract
AbstractThe fine grain, high contrast photographic emulsions, specially designed to detect low surface brightness features against the glow of the night sky at the low light levels found in astronomy are now in widespread use. Their high maximum density and limited dynamic range have encouraged many workers to explore new ways of image extraction and evaluation. This paper summarizes the direct photographic approach to these problems using techniques which arc simple and rapid and which can be used on existing survey or archive material and which have led to the discovery of several new low surface brightness objects of importance in astronomy.The techniques have also been incorporated into an additive system of colour photography well suited to the rather special requirements of astronomy.
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