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Added the Saturation and Lightness transformation for HSL color scheme

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This commit is contained in:
Dominick Pham 2009-08-11 22:09:19 -04:00
parent 3ab509a368
commit 5f11169ef1
3 changed files with 73 additions and 24 deletions
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77
js/franz.js
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@ -18,7 +18,6 @@ var franz = {
canvas: {},
ctx: {},
img: {},
final_colors: [],
red: [],
green: [],
blue: [],
@ -26,6 +25,8 @@ var franz = {
hue: [],
sat: [],
val: [],
satL: [],
light: [],
origIndex: [],
init: function(canvas_id) {
@ -75,7 +76,7 @@ var franz = {
}
/* get hue sat val array */
franz.RGBtoHSV();
franz.RGBtoHSVHL();
/* show original image */
franz.displayImg();
@ -83,33 +84,23 @@ var franz = {
return false;
},
/* Converts RGB to the Hue/Saturation/Value model */
RGBtoHSV: function() {
var min, max, delta;
/* Converts RGB to the Hue/Saturation/Value, Saturation/Lightness model */
RGBtoHSVHL: function() {
var min, max;
for(var i = 0; i < franz.alpha.length; i++) {
franz.val[i] = franz.getValHSV(franz.red[i],franz.green[i],franz.blue[i]);
franz.sat[i] = franz.getSatHSV(franz.red[i],franz.green[i],franz.blue[i]);
franz.hue[i] = franz.getHueHSV(franz.red[i],franz.green[i],franz.blue[i]);
franz.hue[i] = franz.getHue(franz.red[i],franz.green[i],franz.blue[i]);
franz.satL[i] = franz.getSatHSL(franz.red[i],franz.green[i],franz.blue[i]);
franz.light[i] = franz.getLightHSL(franz.red[i],franz.green[i],franz.blue[i]);
}
return false
},
getValHSV: function(red, green, blue) { return Math.max(red,Math.max(green,blue)); },
getSatHSV: function(red, green, blue) {
var min, max, delta, sat;
min = Math.min(red,Math.min(green,blue));
max = Math.max(red,Math.max(green,blue));
delta = max - min;
sat = delta / max;
return sat;
},
getHueHSV: function(red,green,blue) {
getHue: function(red,green,blue) {
var min, max, delta, hue;
min = Math.min(red,Math.min(green,blue));
@ -134,6 +125,40 @@ var franz = {
return hue;
},
getSatHSV: function(red, green, blue) {
var min, max, delta, sat;
min = Math.min(red,Math.min(green,blue));
max = Math.max(red,Math.max(green,blue));
delta = max - min;
sat = delta / max;
return sat;
},
getValHSV: function(red, green, blue) { return Math.max(red,Math.max(green,blue)); },
getSatHSL: function(red, green, blue) {
var min, max, sat;
var lightness = franz.getLightHSL();
min = Math.min(red,Math.min(green,blue));
max = Math.max(red,Math.max(green,blue));
if (min == max) return 0;
if (lightness < 1/2) sat = (max-min)/(max+min);
else sat = (max-min)/(2 - (max+min));
return sat;
},
getLightHSL: function(red, green, blue) {
var min, max;
min = Math.min(red,Math.min(green,blue));
max = Math.max(red,Math.max(green,blue));
return 1/2*(min+max);
},
/* routines to display color swatches */
displayColors: function(order_array) {
@ -180,6 +205,18 @@ var franz = {
franz.displayColors(franz.origIndex);
return false;
},
displaySatL: function() {
franz.resetIndex();
franz.qsort(franz.clone(franz.satL), 0, franz.alpha.length);
franz.displayColors(franz.origIndex);
return false;
},
displayLight: function() {
franz.resetIndex();
franz.qsort(franz.clone(franz.light), 0, franz.alpha.length);
franz.displayColors(franz.origIndex);
return false;
},
/* quicksort algorithm that also swaps an index array */