diff --git a/lib/ext/render.js b/lib/ext/render.js
index ff3b9e0..b711edc 100644
--- a/lib/ext/render.js
+++ b/lib/ext/render.js
@@ -170,12 +170,11 @@ exports.requireExt = function(display, callback)
             }
 
             ext.SetPictureTransform = function(pid, matrix) {
-              var format = 'CCSL';
+              var format = 'CCSLLLLLLLLLLLLL';
               if (matrix.length !== 9)
                 throw 'Render.SetPictureTransform: incorrect transform matrix. Must be array of 9 numbers';
               var params = [ext.majorOpcode, 28, 11, pid];
               for (var i=0; i < 9; ++i) {
-                format += 'L';
                 if (typeof matrix[i] !== 'number')
                   throw 'Render.SetPictureTransform: matrix element must be a number';
                 params.push(floatToFix(matrix[i]));
@@ -201,7 +200,7 @@ exports.requireExt = function(display, callback)
                 reqLen += xutil.padded_length(name.length+3)/4 + filterParams.length;
 
                 if (name == 'nearest' || name == 'bilinear' || name == 'fast' || name == 'good' || name == 'best') {
-                  if (filterParams.length != 0) {
+                  if (filterParams.length !== 0) {
                     throw 'Render.SetPictureFilter: "' + name + '" - unexpected parameters for filters';
                   }
                 } else if (name == 'convolution') {
@@ -213,7 +212,7 @@ exports.requireExt = function(display, callback)
                       params.push(floatToFix(filterParams[i]));
                    }
                 } else if (name == 'binomial' || name == 'gaussian') {
-                   if (filterParams.length < 2) {
+                   if (filterParams.length !== 1) {
                      throw 'Render.SetPictureFilter: "' + name + '" - incorrect number of parameters, must be exactly 1 number, instead got: ' + filterParams;
                    }
                   format += 'L';
@@ -674,23 +673,23 @@ exports.requireExt = function(display, callback)
             /*,
              * Operators only available in version 0.11,
              */
-              BlendMinimum:    0x30,
-              Multiply:    0x30,
-              Screen:    0x31,
-              Overlay:    0x32,
-              Darken:    0x33,
-              Lighten:    0x34,
-              ColorDodge:    0x35,
-              ColorBurn:    0x36,
-              HardLight:    0x37,
-              SoftLight:    0x38,
-              Difference:    0x39,
-              Exclusion:    0x3a,
-              HSLHue:   0x3b,
+              BlendMinimum :    0x30,
+              Multiply     :    0x30,
+              Screen       :    0x31,
+              Overlay      :    0x32,
+              Darken       :    0x33,
+              Lighten      :    0x34,
+              ColorDodge   :    0x35,
+              ColorBurn    :    0x36,
+              HardLight    :    0x37,
+              SoftLight    :    0x38,
+              Difference   :    0x39,
+              Exclusion    :    0x3a,
+              HSLHue       :    0x3b,
               HSLSaturation:    0x3c,
-              HSLColor:    0x3d,
+              HSLColor     :    0x3d,
               HSLLuminosity:    0x3e,
-              BlendMaximum:    0x3e
+              BlendMaximum :    0x3e
             };
 
           ext.PolyEdge = {
@@ -714,7 +713,7 @@ exports.requireExt = function(display, callback)
             Unknown:       0,
             HorizontalRGB: 1,
             HorizontalBGR: 2,
-            VerticalRGB	 : 3,
+            VerticalRGB  : 3,
             VerticalBGR  : 4,
             None         : 5
           };