diff --git a/src/Camera.gd b/src/Camera.gd
index 416e035..8d61a49 100644
--- a/src/Camera.gd
+++ b/src/Camera.gd
@@ -25,8 +25,8 @@ func _process(_delta: float) -> void:
 		old_zoom = self.zoom
 
 func fit_image():
-	if Filesystem.original_image != null:
-		var image_size = Filesystem.original_image.get_size()
+	if Filesystem.input_image_texture != null:
+		var image_size = Filesystem.input_image_texture.get_size()
 		var viewport_size = get_viewport_rect().size
 		var zoomf = 1.0
 		if viewport_size.x / image_size.x * image_size.y > viewport_size.y:
diff --git a/src/Filesystem.gd b/src/Filesystem.gd
index 07911a1..72aca06 100644
--- a/src/Filesystem.gd
+++ b/src/Filesystem.gd
@@ -17,13 +17,12 @@ var shader: Shader:
 		print("Load ", shader_path)
 		return load(shader_path)
 
-var image_path = ""
-
-var original_image: ImageTexture
-var result: Image
+var input_image_path = ""
+var input_image_texture: ImageTexture
+var last_input_image_path = ""
 
 var last_image_savepath = ""
-var last_original_image_path = ""
+var result: Image
 
 func get_absolute_path(p: String) -> String:
 	# this only works on Linux!
@@ -32,16 +31,16 @@ func get_absolute_path(p: String) -> String:
 	return p
 
 func load_image() -> String: # returns an error message
-	print("Load ", image_path)
+	print("Load ", input_image_path)
 	var img = Image.new()
-	var err = img.load(image_path)
+	var err = img.load(input_image_path)
 	if err == OK:
-		original_image = ImageTexture.create_from_image(img)
-		if self.last_image_savepath == "" or image_path != self.last_original_image_path:
-			self.last_image_savepath = image_path
-		self.last_original_image_path = image_path
+		input_image_texture = ImageTexture.create_from_image(img)
+		if self.last_image_savepath == "" or input_image_path != self.last_input_image_path:
+			self.last_image_savepath = input_image_path
+		self.last_input_image_path = input_image_path
 		return ""
-	return error_string(err) + " " + image_path
+	return error_string(err) + " " + input_image_path
 
 func save_result(path: String):
 	print("Export ", path)
diff --git a/src/ImageCompositor.gd b/src/ImageCompositor.gd
index 8ffd699..6d243ef 100644
--- a/src/ImageCompositor.gd
+++ b/src/ImageCompositor.gd
@@ -50,7 +50,7 @@ func set_vsync(enabled: bool):
 		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
 
 func update() -> Array: # returns error messages (strings)
-	if Filesystem.image_path == "":
+	if Filesystem.input_image_path == "":
 		return ["No image loaded!"]
 	var shader = Filesystem.shader # read from disk
 	if shader == null:
@@ -60,16 +60,16 @@ func update() -> Array: # returns error messages (strings)
 		return ["Shader compilation failed!"]
 	var errors = []
 	# load texture
-	var fit_image = Filesystem.image_path != Filesystem.last_original_image_path
+	var fit_image = Filesystem.input_image_path != Filesystem.last_input_image_path
 	var err = Filesystem.load_image()
 	if err != "":
 		errors.append(err)
 		image_viewport_display.hide()
 		return errors
 	# apply texture
-	image_sprite.texture = Filesystem.original_image
-	image_sprite.offset = Filesystem.original_image.get_size() / 2
-	self.size = Filesystem.original_image.get_size()
+	image_sprite.texture = Filesystem.input_image_texture
+	image_sprite.offset = Filesystem.input_image_texture.get_size() / 2
+	self.size = Filesystem.input_image_texture.get_size()
 	# show the image viewport & fit the image
 	if fit_image: camera.fit_image()
 	image_viewport_display.show()
diff --git a/src/MainUI.gd b/src/MainUI.gd
index ee8cd7e..3777edf 100644
--- a/src/MainUI.gd
+++ b/src/MainUI.gd
@@ -92,7 +92,7 @@ func _on_open_shader_dialog_confirmed() -> void:
 
 
 func _on_open_image_dialog_file_selected(path: String) -> void:
-	Filesystem.image_path = path
+	Filesystem.input_image_path = path
 	self._on_apply_shader_button_pressed()
 	
 func _on_open_image_dialog_canceled() -> void: