diff --git a/tools/decoupe-voiture/dub.json b/tools/decoupe-voiture/dub.json
index 5c0bfd8..4808da8 100644
--- a/tools/decoupe-voiture/dub.json
+++ b/tools/decoupe-voiture/dub.json
@@ -5,7 +5,8 @@
 
     "dependencies": 
     {
-        "gamut": "~>3.0"
+        "gamut": "~>3.0",
+        "expression-plus": "~>1.0"
     },
 
     "subConfigurations":
diff --git a/tools/decoupe-voiture/patterns/classic_complete_48x48.json b/tools/decoupe-voiture/patterns/classic_complete_48x48.json
index 1cd5a37..e839f6f 100644
--- a/tools/decoupe-voiture/patterns/classic_complete_48x48.json
+++ b/tools/decoupe-voiture/patterns/classic_complete_48x48.json
@@ -2,12 +2,16 @@
 	"input-size": "3984x2160",
 	"output-size": "3456x960",
 
-	"default-size": "48x48",
+	"default-size": "288x240",
 
 	"copyRects": [
 
-		{ "from": "0,0-48x48", "to": "0,0" },    
-		{ "from": "0,0-48x48", "to": "0,0" }
+		{ "from": "62+240*0,224-(240-62)x168", "to": "288*0,0" },    
+		{ "from": "62+240*1,224-(240-62)x168", "to": "288*1,0" },
+		{ "from": "62+240*1,224-(240-62)x168", "to": "288*2,0" },
+		{ "from": "62+240*1,224-(240-62)x168", "to": "288*3,0" },
+		{ "from": "62+240*1,224-(240-62)x168", "to": "288*4,0" },
+		{ "from": "62+240*1,224-(240-62)x168", "to": "288*5,0" }
 
 	]
 }
\ No newline at end of file
diff --git a/tools/decoupe-voiture/source/main.d b/tools/decoupe-voiture/source/main.d
index 635f0b2..3db23bf 100644
--- a/tools/decoupe-voiture/source/main.d
+++ b/tools/decoupe-voiture/source/main.d
@@ -6,7 +6,7 @@ import std.file;
 import std.conv;
 import std.string;
 import gamut;
-
+import expression;
 
 void usage()
 {
@@ -109,9 +109,10 @@ void processFile(string inputPath, string outputPath, string pattern)
 
     input.convertTo(PixelType.rgba8);
     
+    Size defaultSize = parseSize(patternFile, "default-size", Size(16, 16));
 
-    Size inputSize = parseSize(patternFile, "input-size");
-    Size outputSize = parseSize(patternFile, "output-size");
+    Size inputSize = parseSize(patternFile, "input-size", defaultSize);
+    Size outputSize = parseSize(patternFile, "output-size", defaultSize);
 
     if (inputSize.w != input.width || inputSize.h != input.height)
         throw new Exception("input size mismatch");
@@ -119,7 +120,6 @@ void processFile(string inputPath, string outputPath, string pattern)
     Image output;
     output.create(outputSize.w, outputSize.h, PixelType.rgba8);
 
-    Size defaultSize = parseSize(patternFile, "default-size");
 
     void copyRect(Rect src, Rect dst)
     {
@@ -194,36 +194,36 @@ void rectInsideImage(ref Image i, Rect r)
         throw new Exception("Rectangle exceeds height of image");
 }
 
-Point parsePoint(JSONValue parent, string keyName)
+Point parsePoint(JSONValue parent, string keyName, Size defaultSize)
 {
     string r = parent[keyName].str;
-    return parsePoint(r);
+    return parsePoint(r, defaultSize);
 }
 
-Point parsePoint(string r)
+Point parsePoint(string r, Size defaultSize)
 {
     r = strip(r);
     int cPos = cast(int) r.indexOf(",");
     if (cPos == -1)
         throw new Exception("Point should follow this in format: 4,5");
-    int x = to!int(r[0..cPos]);
-    int y = to!int(r[cPos+1..$]);
+    int x = parseIntegerExpression(r[0..cPos], defaultSize);
+    int y = parseIntegerExpression(r[cPos+1..$], defaultSize);
     return Point(x, y);
 }
 
-Size parseSize(JSONValue parent, string keyName)
+Size parseSize(JSONValue parent, string keyName, Size defaultSize)
 {
-    return parseSize(parent[keyName].str);
+    return parseSize(parent[keyName].str, defaultSize);
 }
 
-Size parseSize(string r)
+Size parseSize(string r, Size defaultSize)
 {    
     r = strip(r);
     int xPos = cast(int) r.indexOf("x");
     if (xPos == -1)
         throw new Exception("Size should follow this in format: 48x48");
-    int w = to!int(r[0..xPos]);
-    int h = to!int(r[xPos+1..$]);
+    int w = parseIntegerExpression(r[0..xPos], defaultSize);
+    int h = parseIntegerExpression(r[xPos+1..$], defaultSize);
     return Size(w, h);
 }
 
@@ -245,16 +245,23 @@ Rect parseRect(string r, Size defaultSize)
 
     if (mPos == -1)
     {
-        pos = parsePoint(r);
+        pos = parsePoint(r, defaultSize);
         size = defaultSize;        
     }
     else
     {
-        pos = parsePoint(r[0..mPos]);
-        size = parseSize(r[mPos+1..$]);
+        pos = parsePoint(r[0..mPos], defaultSize);
+        size = parseSize(r[mPos+1..$], defaultSize);
     }
     
     return Rect(pos, size);
 }
 
-      
\ No newline at end of file
+int parseIntegerExpression(string source, 
+                           Size defaultSize)
+{
+    auto e = compileExpression!int(source);
+    //e["TX"] = defaultSize.w;
+    //e["TY"] = defaultSize.h;
+    return e();
+}
\ No newline at end of file