catch divide-by-zero error in xyz2hunterlab function

1 files changed, 2 insertions, 3 deletions

diff --git a/public/assets/javascripts/ui/editor/LightControl.js b/public/assets/javascripts/ui/editor/LightControl.js
index b1c5b85..1bd660e 100644
--- a/public/assets/javascripts/ui/editor/LightControl.js
+++ b/public/assets/javascripts/ui/editor/LightControl.js
@@ -170,6 +170,7 @@ var LabColorPicker = function (parent, w, h) {
     var y = mix( norm(Lab[2], b_range[0], b_range[1]), 0, hh )
     // move the cursor
     this.setLab(Lab)
+    console.log(rgba)
     return Lab
   }
   this.paint = function() {
@@ -245,13 +246,11 @@ var LabColorPicker = function (parent, w, h) {
   }
   function xyz2hunterlab (XYZ) {
     var X = XYZ[0]
-    var Y = XYZ[1]
+    var Y = XYZ[1] || 1e-6  // otherwise divide-by-zero error when converting rgb(0,0,0)
     var Z = XYZ[2]
     var L = 10 * sqrt( Y )
     var a = 17.5 * ( ( ( 1.02 * X ) - Y ) / sqrt( Y ) )
     var b = 7 * ( ( Y - ( 0.847 * Z ) ) / sqrt( Y ) )
     return [L,a,b]
   }
-
-  // this.paint(val)
 }