= development of a fully automatic contrast enhancement procedure 
which gives excellent results on most images; 
- a simple interactive procedure for contrast enhancement of images 
which are not amenable to the automatic procedure which utilises 
scene statistics from that portion of the scene of interest to 
the customer. 
Not apparent from the foregoing discussion, which is essentially 
technical, is the critical importance of rigorous quality control 
throughout all stages of product generation. This is relatively straight 
forward for imagery but is equally important for digital products. 
3 — DISSEMINATION 
Products and Pricing 
ALS products take the form of computer compatible tapes and photographic 
imagery. Computer compatible tapes are generated in either 
band-interleaved-by-line or band sequential formats at either 1600 or 800 
bits per inch packing density. Imagery is generated at various map scales 
ranging from 1:5 369 000 to 1:50 000. 
Prices for ALS products have been set with a view to achieving full 
operating cost recovery as soon as possible consistent with not stifling 
demand. World parity has been used as the basis for setting ALS prices. 
The aim of the ALS is to provide turn-around time on orders of two weeks 
with priority processing available, at a cost premium, of one week for 
Priority 2 and three days for Priority 1. 
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