Here is the equation in a simpler form:
<https://lh4.googleusercontent.com/-HrQdYtJKcB4/UMurQ1IR8JI/AAAAAAAAAJs/fo69AX6pNwY/s1600/CodeCogsEqn.gif> On Thursday, December 13, 2012 3:30:54 PM UTC-6, bob wrote: > > I noticed the vignette effect on Android looks really good. > > In the code, it boils down to this surprising formula: > > float lumen = shade / (1.0 + exp((dist * inv_max_dist - range) * slope)) + > (1.0 - shade); > > Anyone know where this formula comes from? I was definitely surprised to > see a cameo from the irrational number e. > > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
