From: '''newspam'''@nonad.co.uk   
      
   On 19/11/2025 19:04, Don Y wrote:   
   > On 11/19/2025 3:33 AM, Liz Tuddenham wrote:   
      
   >> I think you might have to measure daylight and darkness observations   
   >> differently.  The apparent temperature of the clouds will increase when   
   >> they are in sunlight - but so will the apparent temperature of the space   
   >> in between them, which is filled with illuminated dust particles.   
   >   
   > But, during daylight, I can distinguish between blue skies and white/grey   
   > clouds.  I don't have to use the same wavelengths for all my observations.   
      
   Although you can probably get away with it orange-deep red.   
      
   A combination of a hot mirror filter (against hot IR) and a low pass   
   wratten 29 or 25 filter will make blue skies pretty much black and still   
   leave clouds looking bright red. Contrast helps AI interpretation.   
      
   Monochrome cameras tend to be cheaper than full colour. Beware that not   
   all colour cameras react well to aggressive optical filters in front of   
   them - Bayer demosaicing can go crazy faced with such weird data.   
      
   --   
   Martin Brown   
      
   --- SoupGate-Win32 v1.05   
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