diff --git a/src/Autoload/Global.gd b/src/Autoload/Global.gd
index c93e65f42..3a34e9a40 100644
--- a/src/Autoload/Global.gd
+++ b/src/Autoload/Global.gd
@@ -277,71 +277,73 @@ func notification_label(text : String) -> void:
 	get_tree().get_root().add_child(notification)
 
 
-func general_undo() -> void:
-	current_project.undos -= 1
-	var action_name : String = current_project.undo_redo.get_current_action_name()
+func general_undo(project : Project = current_project) -> void:
+	project.undos -= 1
+	var action_name : String = project.undo_redo.get_current_action_name()
 	notification_label("Undo: %s" % action_name)
 
 
-func general_redo() -> void:
-	if current_project.undos < current_project.undo_redo.get_version(): # If we did undo and then redo
-		current_project.undos = current_project.undo_redo.get_version()
+func general_redo(project : Project = current_project) -> void:
+	if project.undos < project.undo_redo.get_version(): # If we did undo and then redo
+		project.undos = project.undo_redo.get_version()
 	if control.redone:
-		var action_name : String = current_project.undo_redo.get_current_action_name()
+		var action_name : String = project.undo_redo.get_current_action_name()
 		notification_label("Redo: %s" % action_name)
 
 
-func undo(_frame_index := -1, _layer_index := -1) -> void:
-	general_undo()
-	var action_name : String = current_project.undo_redo.get_current_action_name()
+func undo(_frame_index := -1, _layer_index := -1, project : Project = current_project) -> void:
+	general_undo(project)
+	var action_name : String = project.undo_redo.get_current_action_name()
 	if action_name == "Draw" or action_name == "Rectangle Select" or action_name == "Scale" or action_name == "Merge Layer" or action_name == "Link Cel" or action_name == "Unlink Cel":
 		if _layer_index > -1 and _frame_index > -1:
-			canvas.update_texture(_layer_index, _frame_index)
+			canvas.update_texture(_layer_index, _frame_index, project)
 		else:
-			for i in current_project.frames.size():
-				for j in current_project.layers.size():
-					canvas.update_texture(j, i)
+			for i in project.frames.size():
+				for j in project.layers.size():
+					canvas.update_texture(j, i, project)
 
 		if action_name == "Scale":
 			canvas.camera_zoom()
 
 	elif "Frame" in action_name:
 		# This actually means that frames.size is one, but it hasn't been updated yet
-		if current_project.frames.size() == 2: # Stop animating
+		if project.frames.size() == 2: # Stop animating
 			play_forward.pressed = false
 			play_backwards.pressed = false
 			animation_timer.stop()
 
 	canvas.update()
-	if !current_project.has_changed:
-		current_project.has_changed = true
-		self.window_title = window_title + "(*)"
+	if !project.has_changed:
+		project.has_changed = true
+		if project == current_project:
+			self.window_title = window_title + "(*)"
 
 
-func redo(_frame_index := -1, _layer_index := -1) -> void:
-	general_redo()
-	var action_name : String = current_project.undo_redo.get_current_action_name()
+func redo(_frame_index := -1, _layer_index := -1, project : Project = current_project) -> void:
+	general_redo(project)
+	var action_name : String = project.undo_redo.get_current_action_name()
 	if action_name == "Draw" or action_name == "Rectangle Select" or action_name == "Scale" or action_name == "Merge Layer" or action_name == "Link Cel" or action_name == "Unlink Cel":
 		if _layer_index > -1 and _frame_index > -1:
-			canvas.update_texture(_layer_index, _frame_index)
+			canvas.update_texture(_layer_index, _frame_index, project)
 		else:
-			for i in current_project.frames.size():
-				for j in current_project.layers.size():
-					canvas.update_texture(j, i)
+			for i in project.frames.size():
+				for j in project.layers.size():
+					canvas.update_texture(j, i, project)
 
 		if action_name == "Scale":
 			canvas.camera_zoom()
 
 	elif "Frame" in action_name:
-		if current_project.frames.size() == 1: # Stop animating
+		if project.frames.size() == 1: # Stop animating
 			play_forward.pressed = false
 			play_backwards.pressed = false
 			animation_timer.stop()
 
 	canvas.update()
-	if !current_project.has_changed:
-		current_project.has_changed = true
-		self.window_title = window_title + "(*)"
+	if !project.has_changed:
+		project.has_changed = true
+		if project == current_project:
+			self.window_title = window_title + "(*)"
 
 
 func title_changed(value : String) -> void:
diff --git a/src/Canvas.gd b/src/Canvas.gd
index 899f83e7f..493af0930 100644
--- a/src/Canvas.gd
+++ b/src/Canvas.gd
@@ -164,7 +164,7 @@ func handle_undo(action : String, project : Project = Global.current_project, la
 		var data = cel.image.data
 		cel.image.lock()
 		project.undo_redo.add_undo_property(cel.image, "data", data)
-	project.undo_redo.add_undo_method(Global, "undo", frame_index, layer_index)
+	project.undo_redo.add_undo_method(Global, "undo", frame_index, layer_index, project)
 
 	can_undo = false
 
@@ -199,19 +199,20 @@ func handle_redo(_action : String, project : Project = Global.current_project, l
 
 	for cel in cels:
 		project.undo_redo.add_do_property(cel.image, "data", cel.image.data)
-	project.undo_redo.add_do_method(Global, "redo", frame_index, layer_index)
+	project.undo_redo.add_do_method(Global, "redo", frame_index, layer_index, project)
 	project.undo_redo.commit_action()
 
 
-func update_texture(layer_index : int, frame_index := -1) -> void:
+func update_texture(layer_index : int, frame_index := -1, project : Project = Global.current_project) -> void:
 	if frame_index == -1:
-		frame_index = Global.current_project.current_frame
-	var current_cel : Cel = Global.current_project.frames[frame_index].cels[layer_index]
+		frame_index = project.current_frame
+	var current_cel : Cel = project.frames[frame_index].cels[layer_index]
 	current_cel.image_texture.create_from_image(current_cel.image, 0)
 
-	var frame_texture_rect : TextureRect
-	frame_texture_rect = Global.find_node_by_name(Global.current_project.layers[layer_index].frame_container.get_child(frame_index), "CelTexture")
-	frame_texture_rect.texture = current_cel.image_texture
+	if project == Global.current_project:
+		var frame_texture_rect : TextureRect
+		frame_texture_rect = Global.find_node_by_name(project.layers[layer_index].frame_container.get_child(frame_index), "CelTexture")
+		frame_texture_rect.texture = current_cel.image_texture
 
 
 func onion_skinning() -> void:
diff --git a/src/UI/Dialogs/HSVDialog.gd b/src/UI/Dialogs/HSVDialog.gd
index 380c4943d..e1ddd44cb 100644
--- a/src/UI/Dialogs/HSVDialog.gd
+++ b/src/UI/Dialogs/HSVDialog.gd
@@ -45,17 +45,27 @@ func _on_Apply_pressed() -> void:
 		Global.canvas.handle_undo("Draw")
 		DrawingAlgos.adjust_hsv(current_cel, hue_slider.value, sat_slider.value, val_slider.value, pixels)
 		Global.canvas.handle_redo("Draw")
+
 	elif affect == FRAME:
 		Global.canvas.handle_undo("Draw", Global.current_project, -1)
 		for cel in Global.current_project.frames[Global.current_project.current_frame].cels:
 			DrawingAlgos.adjust_hsv(cel.image, hue_slider.value, sat_slider.value, val_slider.value, pixels)
 		Global.canvas.handle_redo("Draw", Global.current_project, -1)
+
 	elif affect == ALL_FRAMES:
 		Global.canvas.handle_undo("Draw", Global.current_project, -1, -1)
 		for frame in Global.current_project.frames:
 			for cel in frame.cels:
 				DrawingAlgos.adjust_hsv(cel.image, hue_slider.value, sat_slider.value, val_slider.value, pixels)
 		Global.canvas.handle_redo("Draw", Global.current_project, -1, -1)
+
+	elif affect == ALL_PROJECTS:
+		for project in Global.projects:
+			Global.canvas.handle_undo("Draw", project, -1, -1)
+			for frame in project.frames:
+				for cel in frame.cels:
+					DrawingAlgos.adjust_hsv(cel.image, hue_slider.value, sat_slider.value, val_slider.value, pixels)
+			Global.canvas.handle_redo("Draw", project, -1, -1)
 	reset()
 	visible = false
 
diff --git a/src/UI/Dialogs/HSVDialog.tscn b/src/UI/Dialogs/HSVDialog.tscn
index 319edd1b0..d327b85d1 100644
--- a/src/UI/Dialogs/HSVDialog.tscn
+++ b/src/UI/Dialogs/HSVDialog.tscn
@@ -150,7 +150,7 @@ margin_right = 263.0
 margin_bottom = 24.0
 mouse_default_cursor_shape = 2
 text = "Current cel"
-items = [ "Current cel", null, false, 0, null, "Current frame", null, false, 1, null, "All frames", null, false, 2, null, "All projects", null, true, 3, null ]
+items = [ "Current cel", null, false, 0, null, "Current frame", null, false, 1, null, "All frames", null, false, 2, null, "All projects", null, false, 3, null ]
 selected = 0
 
 [node name="HBoxContainer2" type="HBoxContainer" parent="MarginContainer/VBoxContainer"]