make new image using size object

index.js

@@ -48,6 +48,17 @@ function gm (source, height, color) {
 
     this.in("-size", width + "x" + height);
 
+    if (color) {
+      this.in("xc:"+ color);
+    }
+  } else if(source.width && source.height) {
+    // new images
+    width = source.width;
+    height = source.height;
+    source = "";
+
+    this.in("-size", width + "x" + height);
+
     if (color) {
       this.in("xc:"+ color);
     }