Colour pictures with a CCD camera.

Computer Science

Scientific paper

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Scientific paper

The 1.5 m Oanish telescope at La Silla has been used to photograph a number of galaxies with a CCO camera (1) through three different filters: blue (Johnson B), red and infrared (Gunn r (L) and z). The images have been reduced with the ESO image processing system IHAP and then transferred to the VAX computer to use OICOMEO, the high quality hard copy device which produces colour slides. These photographs are in real but not natural colours in the sense that instead of using blue, green and red images, we have used blue, red and infrared. The colour balance is arbitrary but the same for all pictures, except #2. The seeing was 1.2 to 1.5 arcsec. In all cases, north is at the top, east to the left.

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