diff --git a/core/src/processing/core/PImage.java b/core/src/processing/core/PImage.java
index 5b4cc5ba9..9ea1f956e 100644
--- a/core/src/processing/core/PImage.java
+++ b/core/src/processing/core/PImage.java
@@ -594,18 +594,14 @@ public class PImage implements PConstants, Cloneable {
           throw new RuntimeException("Levels must be between 2 and 255 for " +
                                      "filter(POSTERIZE, levels)");
         }
-        // TODO not optimized
-        int levels256 = 256 / levels;
         int levels1 = levels - 1;
         for (int i = 0; i < pixels.length; i++) {
-          int rlevel = ((pixels[i] >> 16) & 0xff) / levels256;
-          int glevel = ((pixels[i] >> 8) & 0xff) / levels256;
-          int blevel = (pixels[i] & 0xff) / levels256;
-
-          rlevel = (rlevel * 255 / levels1) & 0xff;
-          glevel = (glevel * 255 / levels1) & 0xff;
-          blevel = (blevel * 255 / levels1) & 0xff;
-
+          int rlevel = (pixels[i] >> 16) & 0xff;
+          int glevel = (pixels[i] >> 8) & 0xff;
+          int blevel = pixels[i] & 0xff;
+          rlevel = (((rlevel * levels) >> 8) * 255) / levels1;
+          glevel = (((glevel * levels) >> 8) * 255) / levels1;
+          blevel = (((blevel * levels) >> 8) * 255) / levels1;
           pixels[i] = ((0xff000000 & pixels[i]) |
                        (rlevel << 16) |
                        (glevel << 8) |
@@ -1073,7 +1069,7 @@ public class PImage implements PConstants, Cloneable {
 
 
   /**
-   * Blend a two colors based on a particular mode.
+   * Blend two colors based on a particular mode.
    * <PRE>
    * BLEND - linear interpolation of colours: C = A*factor + B
    * ADD - additive blending with white clip: C = min(A*factor + B, 255)
diff --git a/core/todo.txt b/core/todo.txt
index e19465fe9..395093628 100644
--- a/core/todo.txt
+++ b/core/todo.txt
@@ -10,6 +10,18 @@ X opengl doesn't draw a background for the raw recorder
 X change P3D to smooth images nicely (bilinear was disabled)
 X ambientLight(r,g,b) was still ambientLight(r,g,r)
 X   http://dev.processing.org/bugs/show_bug.cgi?id=465
+X fix from dave bollinger for the POSTERIZE filter
+X   http://dev.processing.org/bugs/show_bug.cgi?id=399
+
+_ make sure the docs include "beginShape() cannot be nested"
+
+_ for PShape, need to be able to set the origin (flash people)
+
+_ look into anti-aliasing on osx
+_   http://processing.org/discourse/yabb_beta/YaBB.cgi?board=OpenGL;action=display;num=1164236069
+
+_ 1.5.0_07 and 1.4.2_12 contain the -XX:+HeapDumpOnOutOfMemoryError switch 
+_   invaluable for tracking down memory leaks 
 
 _ an offscreen JAVA2D graphics needs loadPixels() before being drawn
 _   i.e. offscreen JAVA2D, then image() with OPENGL renderer as main