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???
05/02/08 13:40
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 		 #154299 - Human perception of luminance
Responding to: ???'s previous message
Mahmood Elnasser said:

4. The eye's response to PWM is very non linear. So to get 8 relatively even steps of brightness use the following PWM schemes:
7: 100.0% (brightest)
6: 50.0%
5: 25.0%
4: 12.5%
3: 6.3%
2: 3.1%
1: 1.7%
0: 0.0% (off)


I don't know if the eye responds differently to a source driven by PWM but in general the human eye has a non-linear response to luminance. Take a look at section 5 on lightness on the following page:
http://www.poynton.com/notes/col...brightness



List of 31 messages in thread
TopicAuthorDate
outdoor display            01/01/70 00:00      
   LED sign summary            01/01/70 00:00      
      excellente Senor one comment            01/01/70 00:00      
         LEDs arrangement on PCB            01/01/70 00:00      
            The big tradeoff            01/01/70 00:00      
               Reverse engineering            01/01/70 00:00      
                  once color get involved ...            01/01/70 00:00      
      Human perception of luminance            01/01/70 00:00      
         nice, correct, but irrelevant in this respect            01/01/70 00:00      
   Ambient Light Sensor            01/01/70 00:00      
      anything you can read that is ...            01/01/70 00:00      
         TSL250R            01/01/70 00:00      
            maybe not, maybe so            01/01/70 00:00      
               Late Question            01/01/70 00:00      
                  l/f l/v            01/01/70 00:00      
                  i thought those common            01/01/70 00:00      
   LED Panel Fonts            01/01/70 00:00      
      go to the PC            01/01/70 00:00      
      http://www.8052.com/users/bahrio/            01/01/70 00:00      
      Here is a 9Wx7H Font            01/01/70 00:00      
      8x8 char font            01/01/70 00:00      
         go for a proportional font            01/01/70 00:00      
   I Agree; Go Proportional            01/01/70 00:00      
      that's the one            01/01/70 00:00      
         Rotating....            01/01/70 00:00      
            so do I            01/01/70 00:00      
               Luxury?            01/01/70 00:00      
                  no, no squirt            01/01/70 00:00      
      thats exactly the one I was looking for            01/01/70 00:00      
   LED Panel FAQ            01/01/70 00:00      
      LED Panel FAQ does not match what I 'know'            01/01/70 00:00      

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