diff --git a/File.class.php b/File.class.php
new file mode 100644
index 0000000..e44028b
--- /dev/null
+++ b/File.class.php
@@ -0,0 +1,53 @@
+<?php
+
+abstract class File
+{
+    public $path;
+    public $filename;
+    /**
+     * @param array|string $data
+     * @return Image
+     * @throws ErrorException
+     */
+    public static function getInstance($data)
+    {
+        $instance = new static($data);
+        if (is_null($data)) {
+            throw new ErrorException('Empty data for Image::getInstance().');
+        }
+        if (!is_array($data)) {
+            $data = json_decode($data, true);
+            if (json_last_error() != JSON_ERROR_NONE) {
+                throw new ErrorException('Unable to convert json-string to array.');
+            }
+        }
+        foreach ($data as $attribute_name => $attribute_value) {
+            if (property_exists(__CLASS__, $attribute_name)) {
+                $instance->{$attribute_name} = $attribute_value;
+            }
+        }
+        return $instance;
+    }
+
+    /**
+     * @return string
+     */
+    public function getWebName()
+    {
+        return $this->path . '/' . $this->filename;
+    }
+
+    public function __toString()
+    {
+        return self::toString($this);
+    }
+
+    private static function toString($class)
+    {
+        $data = array();
+        foreach ($class as $attribute_name => $attribute_value) {
+            $data[$attribute_name] = $attribute_value;
+        }
+        return json_encode($data);
+    }
+}
\ No newline at end of file
diff --git a/Image.class.php b/Image.class.php
index 6a75a1a..b4093d5 100644
--- a/Image.class.php
+++ b/Image.class.php
@@ -1,18 +1,15 @@
 <?php
 
-class Image
+class Image extends File
 {
     public $width;
     public $height;
     public $type;
     public $size;
-    public $filename;
+
     public $original_filename;
-    public $path;
     public $variants = array();
 
-    private $_is_empty = true;
-
     const SIZE_100_80 = '100x80';
     const SIZE_200_160 = '200x160';
     const SIZE_300_240 = '300x240';
@@ -27,72 +24,18 @@ class Image
     );
 
     /**
-     * @param array|string $data
-     * @return Image
-     * @throws ErrorException
-     */
-    public static function getInstance($data)
-    {
-        $instance = new self($data);
-        if (is_null($data)) {
-            throw new ErrorException('Empty data for Image::getInstance().');
-        }
-        if (!is_array($data)) {
-            $data = json_decode($data, true);
-            if (json_last_error() != JSON_ERROR_NONE) {
-                throw new ErrorException('Unable to convert json-string to array.');
-            }
-        }
-        foreach ($data as $attribute_name => $attribute_value) {
-            if (property_exists(__CLASS__, $attribute_name)) {
-                $instance->{$attribute_name} = $attribute_value;
-            }
-        }
-        $instance->_is_empty = false;
-        return $instance;
-    }
-
-    /**
-     * @return string
-     */
-    public function getWebName()
-    {
-        return $this->path . '/' . $this->filename;
-    }
-
-    /**
      * @param $size string
      * @return Image
      */
     public function getVariant($size)
     {
         if (!array_key_exists($size, $this->variants)) {
-            $this->variants[$size] = new Image;
+            $this->variants[$size] = new ImageVariant;
         } else {
             if (!is_object($this->variants[$size])) {
-                $this->variants[$size] = self::getInstance($this->variants[$size]);
+                $this->variants[$size] = parent::getInstance($this->variants[$size]);
             }
         }
         return $this->variants[$size];
-
-    }
-
-    public function getIsEmpty()
-    {
-        return (bool) $this->_is_empty;
-    }
-
-    public function setIsNotEmpty()
-    {
-        $this->_is_empty = false;
-    }
-
-    public function __toString()
-    {
-        $data = array();
-        foreach ($this as $attribute_name => $attribute_value) {
-            $data[$attribute_name] = $attribute_value;
-        }
-        return json_encode($data);
     }
 }
\ No newline at end of file
diff --git a/ImageVariant.class.php b/ImageVariant.class.php
new file mode 100644
index 0000000..d1f5023
--- /dev/null
+++ b/ImageVariant.class.php
@@ -0,0 +1,9 @@
+<?php
+
+class ImageVariant extends File
+{
+    public $width;
+    public $height;
+    public $type;
+    public $size;
+}
\ No newline at end of file
diff --git a/Upload.class.php b/Upload.class.php
index 79995b8..c7927f8 100644
--- a/Upload.class.php
+++ b/Upload.class.php
@@ -19,7 +19,6 @@ abstract class Upload
     {
         $image = new Image;
         $image->original_filename = $file['name'];
-        $image->type = $file['type'];
         $greagwar_image = self::getGreagwarImage($file['tmp_name']);
         self::saveImage($image, $greagwar_image);
         if ($force_create_variants) {
@@ -40,16 +39,17 @@ abstract class Upload
      */
     public static function saveImage($image, $greagwar_image, $width = null, $height = null, $crop = true)
     {
+        $greagwar_image = clone($greagwar_image);
         if ($width || $height) {
             $greagwar_image->resize($width, $height, 0xffffff, false, false, $crop);
         }
-        $file_path = $greagwar_image->cacheFile($greagwar_image->guessType(), 87, true);
+        $image->type = $greagwar_image->guessType();
+        $file_path = $greagwar_image->cacheFile($image->type, 87, true);
         $image->size = filesize($file_path);
         $path_parts = pathinfo($file_path);
         $image->path = preg_replace('#^' . self::PATH_ROOT . '/#', '', $path_parts['dirname']);
         $image->filename = $path_parts['basename'];
         $image->width = $greagwar_image->width();
         $image->height = $greagwar_image->height();
-        $image->setIsNotEmpty();
     }
 }
\ No newline at end of file
diff --git a/UploadHelper.class.php b/UploadHelper.class.php
index 4b69a66..3251dd7 100644
--- a/UploadHelper.class.php
+++ b/UploadHelper.class.php
@@ -2,26 +2,41 @@
 
 abstract class UploadHelper
 {
+    /**
+     * @param $proportion
+     * @param $file_path
+     * @return bool
+     * @throws ErrorException
+     */
     public static function imageCompareAspectRatio($proportion, $file_path)
     {
-        if (file_exists($file_path) && is_readable($file_path) && is_file($file_path)) {
-            if ($imagesize = getimagesize($file_path)) {
-                $proprtion_parts = explode('x', $proportion);
-                if ($proprtion_parts[0] / $proprtion_parts[1] === $imagesize[0] / $imagesize[1]) {
-                    return true;
-                }
+        if (!(file_exists($file_path) && is_readable($file_path) && is_file($file_path))) {
+            throw new ErrorException('Unable to read file "' . $file_path . '".');
+        }
+        if ($imagesize = getimagesize($file_path)) {
+            $proprtion_parts = explode('x', $proportion);
+            if ($proprtion_parts[0] / $proprtion_parts[1] === $imagesize[0] / $imagesize[1]) {
+                return true;
             }
         }
         return false;
     }
+
+    /**
+     * @param $size
+     * @param $file_path
+     * @return bool
+     * @throws ErrorException
+     */
     public static function imageCompareSize($size, $file_path)
     {
-        if (file_exists($file_path) && is_readable($file_path) && is_file($file_path)) {
-            if ($imagesize = getimagesize($file_path)) {
-                $size_parts = explode('x', $size);
-                if ($imagesize[0] == $size_parts[0] && $imagesize[1] == $size_parts[1]) {
-                    return true;
-                }
+        if (!(file_exists($file_path) && is_readable($file_path) && is_file($file_path))) {
+            throw new ErrorException('Unable to read file "' . $file_path . '".');
+        }
+        if ($imagesize = getimagesize($file_path)) {
+            $size_parts = explode('x', $size);
+            if ($imagesize[0] == $size_parts[0] && $imagesize[1] == $size_parts[1]) {
+                return true;
             }
         }
         return false;