diff --git a/projects/click-cli/basic/echo.py b/projects/click-cli/basic/echo.py
new file mode 100644
index 0000000..467c4db
--- /dev/null
+++ b/projects/click-cli/basic/echo.py
@@ -0,0 +1,25 @@
+import argparse
+
+
+def echo(name=None):
+    print(f"Hello, {name}!")
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="the argparse usage example",
+    )
+    parser.add_argument(
+        "-n",
+        "--name",
+        dest="name",
+        help="the name pass to echo",
+        default="World",
+    )
+    args = parser.parse_args()
+
+    echo(name=args.name)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/projects/click-cli/basic/fake_pip.py b/projects/click-cli/basic/fake_pip.py
new file mode 100644
index 0000000..75acffa
--- /dev/null
+++ b/projects/click-cli/basic/fake_pip.py
@@ -0,0 +1,45 @@
+def fetch(target):
+    print(f"fetch {target}...")
+
+
+def is_url(src):
+    if not (src.startswith("http") and src.startswith("https")):
+        return False
+    return True
+
+
+def download(url_or_package):
+    if not is_url(url_or_package):
+        fetch(url_or_package)
+        return
+
+
+def _install(package=None, requirements=None):
+    if not package and requirements:
+        for _package in requirements:
+            download(_package)
+    elif package and not requirements:
+        download(package)
+    else:
+        raise ValueError(
+            "`package` parameter is required "
+            "if there isn't `requirements` parameter."
+        )
+
+
+class PipCommand:
+    def __init__(self) -> None:
+        pass
+
+    def install(self, *args, **kwargs):
+        _install(*args, **kwargs)
+
+
+if __name__ == '__main__':
+    pip = PipCommand()
+    package = "pandas"
+    requirements = ["pandas", "numpy"]
+
+    # usage
+    pip.install(package=package)
+    pip.install(requirements=requirements)
diff --git a/projects/click-cli/basic/fake_pip_cli.py b/projects/click-cli/basic/fake_pip_cli.py
new file mode 100644
index 0000000..d845de4
--- /dev/null
+++ b/projects/click-cli/basic/fake_pip_cli.py
@@ -0,0 +1,80 @@
+import argparse
+from importlib.metadata import requires
+
+
+def fetch(target):
+    print(f"fetch {target}...")
+
+
+def is_url(src):
+    if not (src.startswith("http") and src.startswith("https")):
+        return False
+    return True
+
+
+def download(url_or_package):
+    if not is_url(url_or_package):
+        fetch(url_or_package)
+        return
+
+
+def _install(package=None, requirements=None):
+    if not package and requirements:
+        for _package in requirements:
+            download(_package)
+    elif package and not requirements:
+        download(package)
+    else:
+        raise ValueError(
+            "`package` parameter is required "
+            "if there isn't `requirements` parameter."
+        )
+
+
+class PipCommand:
+    def __init__(self) -> None:
+        pass
+
+    def install(self, *args, **kwargs):
+        _install(*args, **kwargs)
+
+
+def _tidy_requirements(requirements):
+    filtered = filter(lambda r: not r.startswith("#") and r.strip() != "", requirements)
+    keep = list(map(lambda r: r.strip(), filtered))
+    return keep
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="the fake pip usage example",
+    )
+    subparsers = parser.add_subparsers(
+        description="the sub-command for fake pip tools",
+    )
+
+    parser_install = subparsers.add_parser("install")
+    parser_install.add_argument(
+        "package",
+        type=str,
+        nargs="?",
+        help="the name of package",
+    )
+    parser_install.add_argument(
+        "-r",
+        "--requirements",
+        dest="requirements",
+        help="the requirements file",
+        type=argparse.FileType("r", encoding="utf-8"),
+    )
+
+    args = parser.parse_args()
+    deps = (
+        _tidy_requirements(args.requirements.readlines()) if args.requirements else None
+    )
+    pip = PipCommand()
+    pip.install(args.package, deps)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/projects/click-cli/basic/pipeline.py b/projects/click-cli/basic/pipeline.py
new file mode 100644
index 0000000..5135958
--- /dev/null
+++ b/projects/click-cli/basic/pipeline.py
@@ -0,0 +1,54 @@
+def pipeline(handler, **opts):
+    def decorator(func):
+        def wrapper(*args, **kwargs):
+            result = func(*args, **kwargs)
+            return handler(result, **opts)
+
+        return wrapper
+
+    return decorator
+
+
+def grep(content: str, pattern: str):
+    import re
+
+    filtered = []
+    content = content.splitlines()
+    for line in content:
+        if re.search(pattern, line):
+            filtered.append(line)
+
+    return "\n".join(filtered)
+
+
+def tr(content: str, delete: bool, char: str):
+    final = []
+
+    if delete:
+        content = content.splitlines()
+        for line in content:
+            new_line = line.replace(char, "")
+            final.append(new_line)
+    if final:
+        return "".join(final)
+
+    return content
+
+
+@pipeline(tr, delete=True, char="\n")
+@pipeline(grep, pattern="ed")
+def echo():
+    poetry = """
+Beautiful is better than ugly.
+Explicit is better than implicit.
+Simple is better than complex.
+Complex is better than complicated.
+Flat is better than nested.
+Sparse is better than dense.
+    """
+    return poetry.strip()
+
+
+if __name__ == '__main__':
+    result = echo()
+    print(result)
diff --git a/projects/click-cli/click-usage/click_command.py b/projects/click-cli/click-usage/click_command.py
new file mode 100644
index 0000000..a79ae07
--- /dev/null
+++ b/projects/click-cli/click-usage/click_command.py
@@ -0,0 +1,10 @@
+import click
+
+
+@click.command()
+def greet():
+    pass
+
+
+if __name__ == '__main__':
+    greet()
diff --git a/projects/click-cli/click-usage/click_group.py b/projects/click-cli/click-usage/click_group.py
new file mode 100644
index 0000000..b3a577a
--- /dev/null
+++ b/projects/click-cli/click-usage/click_group.py
@@ -0,0 +1,20 @@
+import click
+
+
+@click.group()
+def pip():
+    ...
+
+
+@pip.command(name="foo")
+def install():
+    click.echo("Installing...")
+
+
+@pip.command(name="nonfoo")
+def uninstall():
+    click.echo("Uninstalling...")
+
+
+if __name__ == '__main__':
+    pip()
diff --git a/projects/click-cli/click-usage/click_multi_commands.py b/projects/click-cli/click-usage/click_multi_commands.py
new file mode 100644
index 0000000..1b99be6
--- /dev/null
+++ b/projects/click-cli/click-usage/click_multi_commands.py
@@ -0,0 +1,38 @@
+import click
+
+
+@click.group()
+def pip():
+    pass
+
+
+@pip.command()
+def install():
+    """pip install method"""
+    click.echo("Installing...")
+
+
+@pip.command()
+def uninstall():
+    """pip uninstall method"""
+    click.echo("Uninstalling...")
+
+
+@click.group()
+def pytest():
+    pass
+
+
+@pytest.command()
+def test():
+    """run the tests."""
+    click.echo("Running tests...")
+
+
+cli = click.CommandCollection(
+    sources=[pip, pytest],
+    help="the collections of custom commands",
+)
+
+if __name__ == '__main__':
+    cli()
diff --git a/projects/click-cli/click-usage/decorator.ipynb b/projects/click-cli/click-usage/decorator.ipynb
new file mode 100644
index 0000000..4ca41cf
--- /dev/null
+++ b/projects/click-cli/click-usage/decorator.ipynb
@@ -0,0 +1,195 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Curry and Closure"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "initializing for request function.\n",
+      "<function init.<locals>.wrapper at 0x7fb82839f0d0>\n",
+      "Query for https://www.sspai.com using GET method.\n",
+      "response\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Initialization without decorator\n",
+    "\n",
+    "def init(func):\n",
+    "    print(f\"initializing for {func.__name__} function.\")\n",
+    "    def wrapper(*args, **kwargs):\n",
+    "        return func(*args, **kwargs)\n",
+    "    return wrapper\n",
+    "\n",
+    "def request(url, method):\n",
+    "    print(f\"Query for {url} using {method} method.\")\n",
+    "    return \"response\"\n",
+    "\n",
+    "prepared_request = init(func=request)\n",
+    "print(prepared_request)\n",
+    "response = prepared_request(\"https://www.sspai.com\", method=\"GET\")\n",
+    "print(response)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "initializing for request function.\n",
+      "Query for https://www.sspai.com using GET method.\n",
+      "response\n"
+     ]
+    }
+   ],
+   "source": [
+    "\n",
+    "# Initialization wit decorator\n",
+    "\n",
+    "def init(func):\n",
+    "    print(f\"initializing for {func.__name__} function.\")\n",
+    "    def wrapper(*args, **kwargs):\n",
+    "        return func(*args, **kwargs)\n",
+    "    return wrapper\n",
+    "\n",
+    "@init\n",
+    "def request(url, method):\n",
+    "    print(f\"Query for {url} using {method} method.\")\n",
+    "    return \"response\"\n",
+    "\n",
+    "response = request(\"https://www.sspai.com\", method=\"GET\")\n",
+    "print(response)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "initializing for request function.\n",
+      "Use headers: {'User-Agent': 'Chrome/101.0.4951.64'}\n",
+      "Query for https://www.sspai.com using GET method.\n",
+      "None\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Initialization with closure\n",
+    "\n",
+    "def init(func):\n",
+    "    headers = {\"User-Agent\": \"Chrome/101.0.4951.64\"}\n",
+    "    print(f\"initializing for {func.__name__} function.\")\n",
+    "    def wrapper(*args, **kwargs):\n",
+    "        result = func(headers=headers, *args, **kwargs)\n",
+    "        return result\n",
+    "    return wrapper\n",
+    "\n",
+    "@init\n",
+    "def request(url, method, **kwargs):\n",
+    "    headers = kwargs.get(\"headers\", None)\n",
+    "    if headers:\n",
+    "        print(f\"Use headers: {headers}\")\n",
+    "    print(f\"Query for {url} using {method} method.\")\n",
+    "\n",
+    "response = request(\"https://www.sspai.com\", method=\"GET\")\n",
+    "print(response)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# currying function\n",
+    "\n",
+    "def curry(func):\n",
+    "\n",
+    "    f_args = []\n",
+    "\n",
+    "    def wrapper(*args):\n",
+    "        if args:\n",
+    "            f_args.extend(args)\n",
+    "            return wrapper\n",
+    "\n",
+    "        result = func(f_args)\n",
+    "        return result\n",
+    "\n",
+    "    return wrapper\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "the result is <function curry.<locals>.wrapper at 0x7fb820779b80> before evaling.\n",
+      "the result is 145 after evaling.\n"
+     ]
+    }
+   ],
+   "source": [
+    "total = curry(sum)\n",
+    "result = total(1)(2)(3, 4)(5, 6)(7, 8, 9)(10, 20, 30, 40)\n",
+    "print(f\"the result is {result} before evaling.\")\n",
+    "result = result()\n",
+    "print(f\"the result is {result} after evaling.\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "interpreter": {
+   "hash": "13977d4cc82dee5f9d9535ceb495bd0ab12a43c33c664e5f0d53c24cf634b67f"
+  },
+  "kernelspec": {
+   "display_name": "Python 3.9.0 ('pandas-startup')",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.0"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/projects/click-cli/click-usage/mocked_curl.py b/projects/click-cli/click-usage/mocked_curl.py
new file mode 100644
index 0000000..5bd492e
--- /dev/null
+++ b/projects/click-cli/click-usage/mocked_curl.py
@@ -0,0 +1,69 @@
+import click
+
+
+def record_params(**kwargs):
+    tmpl = ""
+    for key, value in kwargs.items():
+        tmpl += f"  {key}: {value}\n"
+    return tmpl
+
+
+@click.command()
+@click.argument("url", type=str)
+@click.option(
+    "-X",
+    "--method",
+    default="GET",
+    type=click.Choice(["GET", "POST"], case_sensitive=False),
+    show_default=True,
+    help="the HTTP method to use",
+)
+@click.option(
+    "--data",
+    default=None,
+    multiple=True,
+    help="data to be sent with the request",
+)
+@click.option(
+    "-d",
+    "--header",
+    default=None,
+    multiple=True,
+    help="the request header",
+)
+@click.option(
+    "-v",
+    "--verbose",
+    is_flag=True,
+    help="verbose mode",
+)
+def mocked_curl(url, method, verbose=False, **kwargs):
+    """request for target url"""
+
+    default_params = dict(method=method)
+    extra = {}
+
+    data = kwargs.get("data")
+    header = kwargs.get("header")
+    if header:
+        default_params.update(dict(header=header))
+
+    if method == "POST":
+        if data:
+            extra = dict(method="POST", data=data)
+        else:
+            extra = dict(method="POST")
+
+    if extra:
+        default_params.update(extra)
+
+    if verbose:
+        log = record_params(**default_params)
+        click.echo(f"request for {url} with: \n{log}")
+        return
+
+    click.echo(f"request for {url} ...")
+
+
+if __name__ == '__main__':
+    mocked_curl()
diff --git a/projects/click-cli/setup.py b/projects/click-cli/setup.py
new file mode 100644
index 0000000..2f478ff
--- /dev/null
+++ b/projects/click-cli/setup.py
@@ -0,0 +1,18 @@
+from setuptools import find_packages, setup
+
+setup(
+    name="watermark",
+    version="0.1",
+    author="100gle",
+    py_modules=["watermark"],
+    packages=find_packages(),
+    install_requires=[
+        "Click",
+        "pillow",
+    ],
+    entry_points={
+        "console_scripts": [
+            "watermark=watermark.main:cli",
+        ]
+    },
+)
diff --git a/projects/click-cli/testdata/banner.png b/projects/click-cli/testdata/banner.png
new file mode 100644
index 0000000..6c75ec2
Binary files /dev/null and b/projects/click-cli/testdata/banner.png differ
diff --git a/projects/click-cli/testdata/logo.png b/projects/click-cli/testdata/logo.png
new file mode 100644
index 0000000..f5d1d6c
Binary files /dev/null and b/projects/click-cli/testdata/logo.png differ
diff --git a/projects/click-cli/watermark/PingFang.ttc b/projects/click-cli/watermark/PingFang.ttc
new file mode 100644
index 0000000..68add37
Binary files /dev/null and b/projects/click-cli/watermark/PingFang.ttc differ
diff --git a/projects/click-cli/watermark/__init__.py b/projects/click-cli/watermark/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/projects/click-cli/watermark/cmd.sh b/projects/click-cli/watermark/cmd.sh
new file mode 100644
index 0000000..0a1bfa0
--- /dev/null
+++ b/projects/click-cli/watermark/cmd.sh
@@ -0,0 +1,18 @@
+# text watermark
+watermark text \
+    --font-name=./PingFang.ttc \
+    --font-size=30 \
+    --color=red \
+    --alpha=0.5 \
+    --location=all \
+    --offset=30 \
+    -v "@少数派 sspai" ./testdata/banner.png
+
+# image watermark
+watermark image \
+    --image-watermark-path ./testdata/logo.png \
+    --zoom=0.8 \
+    --alpha=0.8 \
+    --location=bottom \
+    --offset=30 \
+    -v ./testdata/banner.png
\ No newline at end of file
diff --git a/projects/click-cli/watermark/helper.py b/projects/click-cli/watermark/helper.py
new file mode 100644
index 0000000..50bb6a2
--- /dev/null
+++ b/projects/click-cli/watermark/helper.py
@@ -0,0 +1,107 @@
+import logging
+
+from PIL import Image, ImageEnhance
+
+logger = logging.getLogger("watermark.helper")
+
+
+def set_opacity(layer, alpha):
+    if layer.mode != "RGBA":
+        layer = layer.convert("RGBA")
+
+    if 0 <= alpha <= 1:
+        alpha_layer = layer.split()[-1]
+        alpha_layer = ImageEnhance.Brightness(alpha_layer).enhance(alpha)
+        layer.putalpha(alpha_layer)
+    else:
+        logger.warning(
+            f"alpha not works, because the value {alpha} not in [0, 1] interval."
+        )
+
+    return layer
+
+
+def get_location(image_size, marker_size, loc, offset=0):
+    img_x, img_y = image_size
+    mx, my = marker_size
+
+    half_x = int((img_x - mx) / 2)
+    half_y = int((img_y - my) / 2)
+
+    locations = {
+        # top orient
+        "top-left": (0, 0),
+        "top": (half_x, 0),
+        "top-right": (img_x - mx, 0),
+        # center orient
+        "center-left": (0, half_y),
+        "center": (half_x, half_y),
+        "center-right": (img_x - mx, half_y),
+        # bottom orient
+        "bottom-left": (0, img_y - my),
+        "bottom": (half_x, img_y - my),
+        "bottom-right": (img_x - mx, img_y - my),
+    }
+    location = locations[loc]
+    logger.debug(
+        f"image size: {image_size}, marker size: {marker_size}, {loc} default location: {location}"
+    )
+
+    if offset:
+        x, y = location
+
+        if x == 0:
+            x += offset
+        elif x != half_x:
+            x -= offset
+
+        if loc.startswith("top"):
+            y += offset
+        elif loc.startswith("bottom"):
+            y -= offset
+
+        location = (x, y)
+
+    logger.debug(f"{loc} location: {location}")
+
+    return location
+
+
+def adjust_marker_layer(
+    image,
+    marker,
+    loc="center",
+    offset=0,
+    **kwargs,
+):
+    layer = Image.new("RGBA", size=image.size)
+
+    locations = [
+        "top",
+        "top-left",
+        "top-right",
+        "bottom",
+        "bottom-left",
+        "bottom-right",
+        "center",
+        "center-left",
+        "center-right",
+    ]
+
+    if loc != "all":
+        if loc not in locations:
+            logger.warning(f"{loc} location not found, use default location: center")
+            locations = ["center"]
+        else:
+            locations = [loc]
+
+    for location in locations:
+        position = get_location(
+            image.size,
+            marker.size,
+            loc=location,
+            offset=offset,
+        )
+        layer.paste(marker, position, mask=marker)
+
+    return layer
diff --git a/projects/click-cli/watermark/main.py b/projects/click-cli/watermark/main.py
new file mode 100644
index 0000000..cfa9f0b
--- /dev/null
+++ b/projects/click-cli/watermark/main.py
@@ -0,0 +1,211 @@
+import logging
+import pathlib
+
+import click
+from watermark.markers import make
+
+ImagePath = click.Path(exists=True, allow_dash=True, dir_okay=False)
+
+
+def ensure_logger(level):
+    logging.basicConfig(
+        level=level,
+        format="[{asctime}] [{levelname}] [{name}] - {message}",
+        style="{",
+    )
+
+
+logger = logging.getLogger("watermark.cli")
+
+COMMON_OPTIONS = [
+    click.option(
+        "--alpha",
+        type=click.FloatRange(0.0, 1.0),
+        help="the alpha value",
+        show_default=True,
+    ),
+    click.option(
+        "--rotation",
+        type=int,
+        default=0,
+        help="the rotation value",
+        show_default=True,
+    ),
+    click.option(
+        "--offset",
+        type=int,
+        default=30,
+        help="the offset value",
+        show_default=True,
+    ),
+    click.option(
+        "--location",
+        "loc",
+        type=click.Choice(
+            [
+                "top-left",
+                "top",
+                "top-right",
+                "center-left",
+                "center",
+                "center-right",
+                "bottom-left",
+                "bottom",
+                "bottom-right",
+                "all",
+            ]
+        ),
+        default="bottom-right",
+        help="""\
+        the location value,
+        text watermark will be placed at the all locations if set "all" option.
+        """,
+        show_default=True,
+    ),
+    click.option(
+        "-v",
+        "--verbose",
+        is_flag=True,
+        default=False,
+        help="show debug info",
+        show_default=True,
+    ),
+]
+
+
+def shared_options(func):
+    for option in COMMON_OPTIONS[::-1]:
+        func = option(func)
+    return func
+
+
+@click.group(invoke_without_command=True)
+@click.pass_context
+def cli(ctx: click.Context, **kwargs):
+    r"""the watermark cli tools implemented by 100gle."""
+    if not ctx.invoked_subcommand:
+        banner()
+
+
+def banner():
+    msg = r"""
+ _       __        __                                       __
+| |     / /____ _ / /_ ___   _____ ____ ___   ____ _ _____ / /__
+| | /| / // __ `// __// _ \ / ___// __ `__ \ / __ `// ___// //_/
+| |/ |/ // /_/ // /_ /  __// /   / / / / / // /_/ // /   / ,<
+|__/|__/ \__,_/ \__/ \___//_/   /_/ /_/ /_/ \__,_//_/   /_/|_|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Hope you enjoy it.
+You can use this command to get help:
+
+    $ watermark -h
+"""
+    click.echo(msg)
+
+
+@cli.command()
+@click.argument("content")
+@click.argument("path", type=ImagePath)
+@click.option(
+    "-f",
+    "--font-name",
+    "font",
+    type=str,
+    help="the font name value",
+)
+@click.option(
+    "-F",
+    "--font-path",
+    type=ImagePath,
+    help="the font path if font name isn't passed.",
+)
+@click.option(
+    "-s",
+    "--font-size",
+    "size",
+    type=int,
+    default=20,
+    help="the font size value",
+    show_default=True,
+)
+@click.option(
+    "--color",
+    type=str,
+    default="black",
+    help="""\
+    the color value,
+    you can use hex color code like "#000000" or color name "black".
+    """,
+    show_default=True,
+)
+@shared_options
+def text(path, font, font_path, **kwargs):
+    """the sub-command for text watermark."""
+    verbose = kwargs.get("verbose")
+    if verbose:
+        ensure_logger(level=logging.DEBUG)
+        logger.debug("enable verbose mode.")
+
+    font_or_path = font or font_path
+    logger.debug(f"image watermark options are: {kwargs}")
+
+    fpath = pathlib.Path(path)
+
+    name = fpath.stem
+    ext = fpath.suffix
+    image_suffixes = {".jpg", ".jpeg", ".png"}
+    if ext not in image_suffixes:
+        click.echo(f"[WARNING] can't handle {ext} image type.")
+        exit(1)
+
+    marked = make(path=path, text=font_or_path, **kwargs)
+    file = fpath.parent.joinpath(f"{name}_marked{ext}")
+
+    marked.save(file, quality=95)
+
+    logger.debug(f"add watermark to {path} success. see {file}")
+
+
+@cli.command()
+@click.argument("path", type=ImagePath)
+@click.option(
+    "--image-watermark-path",
+    "image_path",
+    type=ImagePath,
+    help="the path of image watermark",
+)
+@click.option(
+    "--zoom",
+    type=float,
+    default=0.5,
+    help="the zoom value",
+    show_default=True,
+)
+@shared_options
+def image(path, image_path, **kwargs):
+    """the sub-command for image watermark."""
+    verbose = kwargs.pop("verbose")
+    if verbose:
+        ensure_logger(level=logging.DEBUG)
+        logger.debug("enable verbose mode.")
+
+    logger.debug(f"image watermark options are: {kwargs}")
+    fpath = pathlib.Path(path)
+
+    name = fpath.stem
+    ext = fpath.suffix
+    image_suffixes = {".jpg", ".jpeg", ".png"}
+    if ext not in image_suffixes:
+        click.echo(f"[WARNING] can't handle {ext} image type.")
+        exit(1)
+
+    marked = make(path=path, image=image_path, **kwargs)
+    file = fpath.parent.joinpath(f"{name}_marked{ext}")
+
+    marked.save(file, quality=95)
+
+    logger.debug(f"add watermark to {path} success. see {file}")
+
+
+if __name__ == "__main__":
+    cli()
diff --git a/projects/click-cli/watermark/markers.py b/projects/click-cli/watermark/markers.py
new file mode 100644
index 0000000..7100935
--- /dev/null
+++ b/projects/click-cli/watermark/markers.py
@@ -0,0 +1,75 @@
+from __future__ import annotations
+
+import logging
+
+from PIL import Image, ImageDraw, ImageFont
+from watermark.helper import adjust_marker_layer, set_opacity
+
+logger = logging.getLogger("watermark.markers")
+
+
+def text_marker(
+    font_or_path,
+    content,
+    size=20,
+    color="black",
+    rotation=0,
+    alpha: int | float = 1,
+    **kwargs,
+):
+
+    # set font and get the font size which determined by content.
+    font = ImageFont.truetype(font_or_path, size=size)
+    CONTENT_SIZE = font.getsize(text=content)
+
+    layer = Image.new("RGBA", CONTENT_SIZE)
+
+    plot = ImageDraw.Draw(layer)
+    plot.text(
+        xy=(0, 0),  # x=0, y=0
+        text=content,
+        fill=color,
+        font=font,
+        align="center",
+    )
+    if rotation:
+        layer = layer.rotate(rotation, expand=True)
+
+    if alpha:
+        layer = set_opacity(layer, alpha)
+
+    return layer
+
+
+def image_marker(fpath, zoom=0.8, rotation=0, alpha: int | float = 1, **kwargs):
+
+    # convert image watermarker to RGBA mode.
+    layer = Image.open(fpath).convert("RGBA")
+
+    width, height = layer.size
+
+    if 0 <= zoom <= 1:
+        layer = layer.resize((int(width * zoom), int(height * zoom)))
+
+    if rotation:
+        layer = layer.rotate(rotation, expand=True)
+
+    if alpha:
+        layer = set_opacity(layer, alpha)
+
+    return layer
+
+
+def make(path, *, text=None, image=None, **kwargs):
+    pic = Image.open(path).convert("RGBA")
+    if text and not image:
+        marker = text_marker(text, **kwargs)
+    elif not text and image:
+        marker = image_marker(image, **kwargs)
+    else:
+        raise ValueError("use text or image")
+
+    layer = adjust_marker_layer(pic, marker, **kwargs)
+    marked = Image.alpha_composite(pic, layer)
+
+    return marked