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Mars 21/09/20


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About this observation
David Basey
Time of observation
21/09/2020 - 01:35
Observing location
358mm Dobsonian
Altair 178M3 camera
W25 red filter
W58 green filter
W47 blue/violet filter

This is the result of a personal 'luminance' experiment. The usual approach is to use either a red or IR image as a luminance channel. This certainly enhances the surface detail but can suppress any clouds that are largely visible in blue light. These have been fairly scarce this apparition so it is not a major issue thus far.

This afternoon while reading the Registax manual (!) I discovered the 'Colour Mixing' option. This allows construction of a luminance channel from all three RGB images balancing the contribution of each. In this way it is possible to retain more of the blue image's contribution.

The result seems quite pleasing.

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