My leds are on when screen is black

Threshold parameter is responsible for minimum color value (read by hyperion form the input) that is displayed by leds. In the settings above, 5% of brightness of each color will already light led up. If your leds are on when the screen is black, increase threshold to appropriate value which may be different depending on the source.

Please note that it is worth to increase gamma as well in order to avoid solid, bright colors when threshold is minimally exceeded.

Blacklevel is brightness of led when the screen is black (in this case you want to keep it at 0)
Whitelevel is maximum brightness of the color (when the screen is white).

 
"transform":[
   {
      "id":"default",
      "leds":"*",
      "hsv":{
         "saturationGain":1.0000,
         "valueGain":1.0000
      },
      "red":{
         "threshold":0.0500,
         "gamma":1.8000,
         "blacklevel":0.0000,
         "whitelevel":1.0000
      },
      "green":{
         "threshold":0.0500,
         "gamma":1.7000,
         "blacklevel":0.0000,
         "whitelevel":0.8000
      },
      "blue":{
         "threshold":0.0500,
         "gamma":1.7000,
         "blacklevel":0.0000,
         "whitelevel":0.8000
      }
   }
],

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