Capture screen by PrintScreen (on Mac with Karabiner)

karabiner.json (snippet)

                    {
                        "description": "Capture entire screen by PrintScreen",
                        "manipulators": [
                            {
                                "from": {
                                    "key_code": "print_screen"
                                },
                                "to": [
                                    {
                                        "key_code": "3",
                                        "modifiers": [
                                            "left_command",
                                            "left_shift"
                                        ]
                                    }
                                ],
                                "type": "basic"
                            }
                        ]
                    },
                    {
                        "description": "Capture a window by Alt+PrintScreen",
                        "manipulators": [
                            {
                                "from": {
                                    "key_code": "print_screen",
                                    "modifiers": {
                                        "mandatory": [
                                            "left_option"
                                        ]
                                    }
                                },
                                "parameters": {
                                    "basic.to_delayed_action_delay_milliseconds": 50
                                },
                                "to": [
                                    {
                                        "key_code": "4",
                                        "modifiers": [
                                            "left_command",
                                            "left_shift"
                                        ]
                                    }
                                ],
                                "to_delayed_action": {
                                    "to_if_invoked": [
                                        {
                                            "key_code": "spacebar"
                                        }
                                    ]
                                },
                                "type": "basic"
                            }
                        ]
                    }