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actionscript: change hue

Posted on 2004-04-12
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Last Modified: 2008-09-22
I would like to know if there is a function to change the hue of a movie clip on the fly.
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Question by:AZAKA
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krishnaprathab earned 125 total points
ID: 10833891
Hi,

 There is no way by which you can change the hue of the MovieClip on the fly. Unless you write a custom (and ofcourse complex function) which can manipulate the colors and do for you. As far as my knowldge there is no function which does this.

The closest which I was able to find for you was this code at actionscript.org :


//this function acts on normalized values for hue,luminosity,saturation
//numbers between 0-1
hls2rgb=function(h,l,s){
      var r,g,b
      if(!s){
              r=g=b=l
      }else{
            var t1,t2,rt3,gt3,bt3
              if(l<0.5) t2=l*(1.0+s)

              if(l>=0.5){
                  t2=l+s-l*s
                  t1 = (2*l)-t2
            }
            rt3=h+1/3
            if(rt3<0)rt3++
            if(rt3>1)rt3--
            gt3=h
              if(gt3<0)gt3++
              if(gt3>1)gt3--
              bt3=h-1/3
              if(bt3<0)bt3++
              if(bt3>1)bt3--
             if(6*rt3<1){
                  r=t1+(t2-t1)*6.0*rt3
            }else if(2*rt3<1){
                  r=t2
              }else if(3*rt3<2){
                  r=t1+(t2-t1)*((2.0/3.0)-rt3)*6
              }else{
                     r=t1
              }
            if(6*gt3<1){
                  g=t1+(t2-t1)*6.0*gt3
            }else if(2*gt3<1){
                  g=t2
            }else if(3*gt3<2){
                  g=t1+(t2-t1)*((2.0/3.0)-gt3)*6
            }else{
                  g=t1
            }
            if(6*bt3<1){
                  b=t1+(t2-t1)*6.0*bt3
            }else if(2*bt3<1){
                  b=t2
            }else if(3*bt3<2){
                  b=t1+(t2-t1)*((2.0/3.0)-bt3)*6
            }else{
                  b=t1
            }  
      }
      return {r:r,g:g,b:b}
}


/*test it out
hue=90 // 0-360 degrees
luminosity=50 //0-100 percent
saturation=50 //0-100 percent

rgb=hls2rgb(hue,luminosity/100,saturation/100)
r=rgb.r*255 //convert back to range
g=rgb.g*255 //convert back to range
b=rgb.b*255 //convert back to range
hex=r<<16|g<<8|b //convert to hex for use with color object*/
 
Let me know if this helped !

Thanks,
KP
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