diff --git a/src/upscaler.py b/src/upscaler.py
index 0bb07c6..3d741b5 100755
--- a/src/upscaler.py
+++ b/src/upscaler.py
@@ -4,7 +4,7 @@
 Name: Video2X Upscaler
 Author: K4YT3X
 Date Created: December 10, 2018
-Last Modified: June 7, 2020
+Last Modified: June 8, 2020
 
 Description: This file contains the Upscaler class. Each
 instance of the Upscaler class is an upscaler on an image or
@@ -50,7 +50,7 @@ language.install()
 _ = language.gettext
 
 # version information
-UPSCALER_VERSION = '4.2.1'
+UPSCALER_VERSION = '4.2.2'
 
 # these names are consistent for
 # - driver selection in command line
@@ -73,23 +73,39 @@ class Upscaler:
         ArgumentError -- if argument is not valid
     """
 
-    def __init__(self, input_path, output_path, driver_settings, ffmpeg_settings, gifski_settings):
-        # mandatory arguments
+    def __init__(
+        self,
+        input_path: pathlib.Path or list,
+        output_path: pathlib.Path,
+        driver_settings: dict,
+        ffmpeg_settings: dict,
+        gifski_settings: dict,
+        driver: str = 'waifu2x_caffe',
+        scale_ratio: float = None,
+        processes: int = 1,
+        video2x_cache_directory: pathlib.Path = pathlib.Path(tempfile.gettempdir()) / 'video2x',
+        extracted_frame_format: str = 'png',
+        image_output_extension: str = '.png',
+        video_output_extension: str = '.mp4',
+        preserve_frames: bool = False
+    ):
+
+        # required parameters
         self.input = input_path
         self.output = output_path
         self.driver_settings = driver_settings
         self.ffmpeg_settings = ffmpeg_settings
         self.gifski_settings = gifski_settings
 
-        # optional arguments
-        self.driver = 'waifu2x_caffe'
-        self.scale_ratio = None
-        self.processes = 1
-        self.video2x_cache_directory = pathlib.Path(tempfile.gettempdir()) / 'video2x'
-        self.extracted_frame_format = 'png'
-        self.image_output_extension = '.png'
-        self.video_output_extension = '.mp4'
-        self.preserve_frames = False
+        # optional parameters
+        self.driver = driver
+        self.scale_ratio = scale_ratio
+        self.processes = processes
+        self.video2x_cache_directory = video2x_cache_directory
+        self.extracted_frame_format = extracted_frame_format
+        self.image_output_extension = image_output_extension
+        self.video_output_extension = video_output_extension
+        self.preserve_frames = preserve_frames
 
         # other internal members and signals
         self.running = False
diff --git a/src/video2x.py b/src/video2x.py
index 3ceec07..dbda134 100755
--- a/src/video2x.py
+++ b/src/video2x.py
@@ -13,7 +13,7 @@ __      __  _       _                  ___   __   __
 Name: Video2X Controller
 Creator: K4YT3X
 Date Created: Feb 24, 2018
-Last Modified: June 7, 2020
+Last Modified: June 8, 2020
 
 Editor: BrianPetkovsek
 Last Modified: June 17, 2019
@@ -81,7 +81,7 @@ language = gettext.translation(DOMAIN, LOCALE_DIRECTORY, [default_locale], fallb
 language.install()
 _ = language.gettext
 
-CLI_VERSION = '4.1.0'
+CLI_VERSION = '4.1.1'
 
 LEGAL_INFO = _('''Video2X CLI Version: {}
 Upscaler Version: {}
@@ -236,21 +236,24 @@ try:
     begin_time = time.time()
 
     # initialize upscaler object
-    upscaler = Upscaler(input_path=video2x_args.input,
-                        output_path=video2x_args.output,
-                        driver_settings=driver_settings,
-                        ffmpeg_settings=ffmpeg_settings,
-                        gifski_settings=gifski_settings)
+    upscaler = Upscaler(
+        # required parameters
+        input_path=video2x_args.input,
+        output_path=video2x_args.output,
+        driver_settings=driver_settings,
+        ffmpeg_settings=ffmpeg_settings,
+        gifski_settings=gifski_settings,
 
-    # set upscaler optional options
-    upscaler.driver = video2x_args.driver
-    upscaler.scale_ratio = video2x_args.ratio
-    upscaler.processes = video2x_args.processes
-    upscaler.video2x_cache_directory = video2x_cache_directory
-    upscaler.extracted_frame_format = extracted_frame_format
-    upscaler.image_output_extension = image_output_extension
-    upscaler.video_output_extension = video_output_extension
-    upscaler.preserve_frames = preserve_frames
+        # optional parameters
+        driver=video2x_args.driver,
+        scale_ratio=video2x_args.ratio,
+        processes=video2x_args.processes,
+        video2x_cache_directory=video2x_cache_directory,
+        extracted_frame_format=extracted_frame_format,
+        image_output_extension=image_output_extension,
+        video_output_extension=video_output_extension,
+        preserve_frames=preserve_frames
+    )
 
     # run upscaler
     upscaler.run()
diff --git a/src/video2x_gui.py b/src/video2x_gui.py
index ba0983b..d789204 100755
--- a/src/video2x_gui.py
+++ b/src/video2x_gui.py
@@ -4,7 +4,7 @@
 Creator: Video2X GUI
 Author: K4YT3X
 Date Created: May 5, 2020
-Last Modified: June 7, 2020
+Last Modified: June 8, 2020
 """
 
 # local imports
@@ -34,7 +34,7 @@ from PyQt5.QtGui import *
 from PyQt5.QtWidgets import *
 import magic
 
-GUI_VERSION = '2.7.0'
+GUI_VERSION = '2.7.1'
 
 LEGAL_INFO = f'''Video2X GUI Version: {GUI_VERSION}\\
 Upscaler Version: {UPSCALER_VERSION}\\
@@ -1173,21 +1173,24 @@ It\'s also highly recommended for you to attach the [log file]({}) under the pro
             # load driver settings for the current driver
             self.driver_settings = self.config[AVAILABLE_DRIVERS[self.driver_combo_box.currentText()]]
 
-            self.upscaler = Upscaler(input_path=input_directory,
-                                     output_path=output_directory,
-                                     driver_settings=self.driver_settings,
-                                     ffmpeg_settings=self.ffmpeg_settings,
-                                     gifski_settings=self.gifski_settings)
+            self.upscaler = Upscaler(
+                # required parameters
+                input_path=input_directory,
+                output_path=output_directory,
+                driver_settings=self.driver_settings,
+                ffmpeg_settings=self.ffmpeg_settings,
+                gifski_settings=self.gifski_settings,
 
-            # set optional options
-            self.upscaler.driver = AVAILABLE_DRIVERS[self.driver_combo_box.currentText()]
-            self.upscaler.scale_ratio = self.scale_ratio_double_spin_box.value()
-            self.upscaler.processes = self.processes_spin_box.value()
-            self.upscaler.video2x_cache_directory = pathlib.Path(os.path.expandvars(self.cache_line_edit.text()))
-            self.upscaler.extracted_frame_format = self.config['video2x']['extracted_frame_format'].lower()
-            self.upscaler.image_output_extension = self.image_output_extension_line_edit.text()
-            self.upscaler.video_output_extension = self.video_output_extension_line_edit.text()
-            self.upscaler.preserve_frames = bool(self.preserve_frames_check_box.isChecked())
+                # optional parameters
+                driver=AVAILABLE_DRIVERS[self.driver_combo_box.currentText()],
+                scale_ratio=self.scale_ratio_double_spin_box.value(),
+                processes=self.processes_spin_box.value(),
+                video2x_cache_directory=pathlib.Path(os.path.expandvars(self.cache_line_edit.text())),
+                extracted_frame_format=self.config['video2x']['extracted_frame_format'].lower(),
+                image_output_extension=self.image_output_extension_line_edit.text(),
+                video_output_extension=self.video_output_extension_line_edit.text(),
+                preserve_frames=bool(self.preserve_frames_check_box.isChecked())
+            )
 
             # run upscaler
             worker = UpscalerWorker(self.upscaler.run)
diff --git a/src/video2x_gui.ui b/src/video2x_gui.ui
index ccb57b4..2445d14 100644
--- a/src/video2x_gui.ui
+++ b/src/video2x_gui.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>673</width>
-    <height>910</height>
+    <width>727</width>
+    <height>908</height>
    </rect>
   </property>
   <property name="acceptDrops">
@@ -2835,7 +2835,7 @@
     <rect>
      <x>0</x>
      <y>0</y>
-     <width>673</width>
+     <width>727</width>
      <height>21</height>
     </rect>
    </property>