diff --git a/src/Mike42/Escpos/Printer.php b/src/Mike42/Escpos/Printer.php
index 05c8a6f0..50da3041 100644
--- a/src/Mike42/Escpos/Printer.php
+++ b/src/Mike42/Escpos/Printer.php
@@ -361,7 +361,7 @@ public function __construct(PrintConnector $connector, CapabilityProfile $profil
     {
         /* Set connector */
         $this -> connector = $connector;
-        
+
         /* Set capability profile */
         if ($profile === null) {
             $profile = CapabilityProfile::load('default');
@@ -373,7 +373,7 @@ public function __construct(PrintConnector $connector, CapabilityProfile $profil
         $this -> setPrintBuffer($buffer);
         $this -> initialize();
     }
-    
+
     /**
      * Print a barcode.
      *
@@ -440,7 +440,7 @@ public function barcode(string $content, int $type = Printer::BARCODE_CODE39)
         // More advanced function B, used in preference
         $this -> connector -> write(self::GS . "k" . chr($type) . chr(strlen($content)) . $content);
     }
-    
+
     /**
      * Print an image, using the older "bit image" command. This creates padding on the right of the image,
      * if its width is not divisible by 8.
@@ -501,7 +501,7 @@ public function close()
     {
         $this -> connector -> finalize();
     }
-    
+
     /**
      * Cut the paper.
      *
@@ -513,7 +513,7 @@ public function cut(int $mode = Printer::CUT_FULL, int $lines = 3)
         // TODO validation on cut() inputs
         $this -> connector -> write(self::GS . "V" . chr($mode) . chr($lines));
     }
-    
+
     /**
      * Print and feed line / Print and feed n lines.
      *
@@ -564,7 +564,7 @@ public function getCharacterTable()
     {
         return $this -> characterTable;
     }
-    
+
     /**
      * @return PrintBuffer
      */
@@ -621,7 +621,53 @@ public function graphics(EscposImage $img, int $size = Printer::IMG_DEFAULT)
         $this -> wrapperSendGraphicsData('0', 'p', $header . $rasterData);
         $this -> wrapperSendGraphicsData('0', '2');
     }
-    
+
+    /**
+     * Print NV graphics data which is stored on the printer
+     *
+     * Valid keycodes range from 32 to 126
+     * Valid scale factors: 1 or 2
+     *
+     * @param int $keyCode1
+     * @param int $keyCode2
+     * @param int $scaleWidth Width scale factor
+     * @param int $scaleHeight Height scale factor
+     * @return bool
+     */
+    public function printNvImage(int $keyCode1, int $keyCode2, int $scaleWidth = 1, int $scaleHeight = 1): bool
+    {
+        if (! (
+                ($keyCode1 > 31 && $keyCode1 < 127)
+                && ($keyCode2 > 31 && $keyCode2 < 127)
+            ) // valid keycode range
+        ) {
+            return false;
+        }
+
+        if (! (
+                ($scaleWidth > 0  && $scaleWidth < 3)
+                && ($scaleHeight > 0  && $scaleHeight < 3)
+            ) // valid scale factors
+        ) {
+            return false;
+        }
+
+        $this->connector->write(
+            self::GS
+            . "(L"
+            . chr(6)
+            . chr(0)
+            . chr(48)
+            . chr(69)
+            . chr($keyCode1)
+            . chr($keyCode2)
+            . chr($scaleWidth)
+            . chr($scaleHeight)
+        );
+
+        return true;
+    }
+
     /**
      * Initialize printer. This resets formatting back to the defaults.
      */
@@ -805,7 +851,7 @@ public function setBarcodeWidth(int $width = 3)
         self::validateInteger($width, 1, 255, __FUNCTION__);
         $this -> connector -> write(self::GS . "w" . chr($width));
     }
-    
+
     /**
      * Set the position for the Human Readable Interpretation (HRI) of barcode characters.
      *
@@ -818,7 +864,7 @@ public function setBarcodeTextPosition(int $position = Printer::BARCODE_TEXT_NON
         self::validateInteger($position, 0, 3, __FUNCTION__, "Barcode text position");
         $this -> connector -> write(self::GS . "H" . chr($position));
     }
-    
+
     /**
      * Turn double-strike mode on/off.
      *
@@ -851,7 +897,7 @@ public function setEmphasis(bool $on = true)
         self::validateBoolean($on, __FUNCTION__);
         $this -> connector -> write(self::ESC . "E". ($on ? chr(1) : chr(0)));
     }
-    
+
     /**
      * Select font. Most printers have two fonts (Fonts A and B), and some have a third (Font C).
      *
@@ -862,7 +908,7 @@ public function setFont(int $font = Printer::FONT_A)
         self::validateInteger($font, 0, 2, __FUNCTION__);
         $this -> connector -> write(self::ESC . "M" . chr($font));
     }
-    
+
     /**
      * Select justification.
      *
@@ -936,7 +982,7 @@ public function setPrintBuffer(PrintBuffer $buffer)
         $this -> buffer = $buffer;
         $this -> buffer -> setPrinter($this);
     }
-    
+
     /**
      * Set black/white reverse mode on or off. In this mode, text is printed white on a black background.
      *
@@ -1025,7 +1071,7 @@ public function textRaw(string $str = "")
     {
         $this -> buffer -> writeTextRaw((string)$str);
     }
-    
+
     /**
      * Wrapper for GS ( k, to calculate and send correct data length.
      *
@@ -1043,7 +1089,7 @@ protected function wrapperSend2dCodeData(string $fn, string $cn, string$data = '
         $header = $this -> intLowHigh(strlen($data) + strlen($m) + 2, 2);
         $this -> connector -> write(self::GS . "(k" . $header . $cn . $fn . $m . $data);
     }
-    
+
     /**
      * Wrapper for GS ( L, to calculate and send correct data length.
      *
@@ -1060,7 +1106,7 @@ protected function wrapperSendGraphicsData(string $m, string $fn, string$data =
         $header = $this -> intLowHigh(strlen($data) + 2, 2);
         $this -> connector -> write(self::GS . "(L" . $header . $m . $fn . $data);
     }
-    
+
     /**
      * Convert widths and heights to characters. Used before sending graphics to set the size.
      *
@@ -1081,7 +1127,7 @@ protected static function dataHeader(array $inputs, bool $long = true)
         }
         return implode("", $outp);
     }
-    
+
     /**
      * Generate two characters for a number: In lower and higher parts, or more parts as needed.
      *
@@ -1100,7 +1146,7 @@ protected static function intLowHigh(int $input, int $length)
         }
         return $outp;
     }
-    
+
     /**
      * Throw an exception if the argument given is not a boolean
      *
@@ -1146,7 +1192,7 @@ protected static function validateInteger(int $test, int $min, int $max, string
     {
         self::validateIntegerMulti($test, [[$min, $max]], $source, $argument);
     }
-    
+
     /**
      * Throw an exception if the argument given is not an integer within one of the specified ranges
      *