The 'real' meaning of blend level transparency integers

David Glasgow david at
Mon Nov 12 05:56:17 CST 2007

On 9 Nov 2007, at 6:00 pm, Jim Ault wrote:

> You probably need to 1) calibrate the monitors on some computers  
> running
> different OSes/monitors, 2) set the transparency+background of a test
> pattern (like they do in TV broadcasting), 3) then build a curve  
> that gets
> you the 'human linear' transparency values.  Do one according to  
> your eye,
> then see if others agree with you.

Thanks, Jim.

Maybe I could do  that by building some kind of calibration routine  
into the procedure itself.  Maybe this could establish individual  
transparency thresholds irrespective of hardware, software, mindware  
and eyewear ;-)

Now, how did those old psycho-physicists determine the Just  
Noticeable Difference?  Wikipedia here I come

Best Wishes,

David Glasgow
Carlton Glasgow Partnership

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