I found a fix for the occasional oversaturated planets – delete the SteamLibrarysteamappscommonElite DangerousProductselite-dangerous-odyssey-64GraphicsConfiguration.xml
file and then revalidate game files to download a fresh version of the file. When I did this 4 other missing files were reported as needing re-downloading.
Previously, no matter what the setting in the game or config files, and even restarting without making any changes would give me blotchy oversaturated surfaces as shown here
and here
I haven't seen this since.
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For the Moiré issue – set Terrain Material Quality down to medium to prevent Moire patterns as shown here
Might be useful to other cmdrs.