// example for as3, which is similar to early android

import flash.display.MovieClip;

// standard luminance values
var lumR:Number = 0.2125;
var lumG:Number = 0.7154;
var lumB:Number = 0.0721;

//var lumR:Number = 0.3086;
//var lumG:Number = 0.6094;
//var lumB:Number = 0.0820;

var color1:Array = [90.0/255.0, 170.0/255.0, 251.0/255.0];
var color2:Array = [5.0/255.0, 57.0/255.0, 109.0/255.0];
//var color1:Array = [247.0/255.0, 238.0/255.0, 87.0/255.0];
//var color2:Array = [182.0/255.0, 14.0/255.0, 77.0/255.0];

// get difference of colors
var rDif = color1[0] - color2[0];
var gDif = color1[1] - color2[1];
var bDif = color1[2] - color2[2];

// movieclip on stage named "pic"
var pic:MovieClip = getChildByName("pic") as MovieClip;

// converts image to grayscale based on luminance value
var lumMat:Array = new Array();
	lumMat=lumMat.concat([lumR,   lumG, lumB, 0, 0]);
	lumMat=lumMat.concat([lumR,   lumG, lumB, 0, 0]);
	lumMat=lumMat.concat([lumR,   lumG, lumB, 0, 0]);
	lumMat=lumMat.concat([0,   0, 0, 1, 0]);

// matrix to multiply value diff by color diff
var colorMat:Array = new Array();			
	colorMat=colorMat.concat([rDif,   0, 0, 0, color2[0] * 255 ]);
	colorMat=colorMat.concat([0,   gDif, 0, 0, color2[1] * 255 ]);
	colorMat=colorMat.concat([0,   0, bDif, 0, color2[2] * 255 ]);
	colorMat=colorMat.concat([0, 0, 0, 1, 0]);

var lum = new ColorMatrixFilter(lumMat);
var mat = new ColorMatrixFilter(colorMat);

// apply the filters
pic.filters = [lum, mat];