diff --git a/2020/027_excel_control_by_python/excel_control_sample_draw_bitmap.py b/2020/027_excel_control_by_python/excel_control_sample_draw_bitmap.py
new file mode 100644
index 00000000..a41836d0
--- /dev/null
+++ b/2020/027_excel_control_by_python/excel_control_sample_draw_bitmap.py
@@ -0,0 +1,122 @@
+# -*- coding: utf-8 -*-
+"""
+sample code for excel control using python
+==========================================
+
+* draw Gawr Gura's twitter banner
+"""
+
+# import standard libraries
+import os
+
+# import third-party libraries
+import cv2
+import numpy as np
+
+# import my libraries
+import excel_control_utility as ecu
+
+# banner https://twitter.com/gawrgura
+IMG_DATA = "./img/1500x500.jpg"
+
+
+def conv_rgb_8bit_color_to_excel_24bit_format(rgb):
+    """
+    convert from 8bit rgb array to 24bit color value for excel.
+
+    Parameters
+    ----------
+    rgb : ndarray
+        8 bit image data.
+
+    Returns
+    -------
+    ndarray
+        24bit color values for excel.
+
+    Examples
+    --------
+    >>> img = np.array(
+    ...     [[[255, 0, 0], [0, 255, 0]],
+    ...      [[0, 0, 255], [64, 128, 192]]])
+    >>> conv_rgb_8bit_color_to_excel_24bit_format(rgb=img)
+
+    """
+    # return r * 0x00000001 + g * 0x00000100 + b * 0x00010000
+    return rgb[..., 0] * 0x00000001 + np.uint32(rgb[..., 1]) * 0x0000100\
+        + rgb[..., 2] * 0x00010000
+
+
+def load_8bit_image(fname=IMG_DATA):
+    img = cv2.imread(IMG_DATA)[..., ::-1]
+
+    return img
+
+
+def crop_and_resize_image(img):
+    img_crop = img[:, 327:327+1045, :]
+    scale_factor = 3
+    after_width = img_crop.shape[1] // scale_factor
+    after_height = img_crop.shape[0] // scale_factor
+    out_img = cv2.resize(
+        img_crop, dsize=(after_width, after_height))
+
+    return out_img
+
+
+def draw_banner(ws):
+    """
+    draw the twitter banner on the Excel.
+
+    Parameters
+    ----------
+    ws : win32com.client.CDispatch
+        excel worksheet
+    """
+    # 画像の準備
+    img_org = load_8bit_image(fname=IMG_DATA)
+    img = crop_and_resize_image(img_org)
+    img_width = img.shape[1]
+    img_height = img.shape[0]
+    img_color = conv_rgb_8bit_color_to_excel_24bit_format(img)
+
+    # セルが正方形となるようにサイズ変更
+    ecu.change_col_width(ws, 0.5, st_pos_col=0, col_num=img_width)
+    ecu.change_row_height(ws, 5.5, st_pos_row=0, row_num=img_height)
+
+    # 描画 (Interior.Color は配列アクセスできなかった🥺🥺🥺)
+    for row_idx in range(img_height):
+        for col_idx in range(img_width):
+            ws.Cells(row_idx + 1, col_idx + 1).Interior.Color\
+                = img_color[row_idx, col_idx]
+
+
+def main_func():
+    # エクセルアプリ起動
+    excel_app = ecu.launch_excel_app()
+
+    # 最大化
+    ecu.maximize_excel_window(excel_app)
+
+    # エクセルファイル新規作成
+    wb = ecu.create_excel_file(excel_app=excel_app)
+
+    # シート1 に 1次元の塗りつぶしを実行
+    ws = wb.Worksheets(1)
+    ws.Name = "DRAW"
+    draw_banner(ws)
+
+    # 保存
+    ecu.save_excel_file(
+        filename="./draw_sample.xlsx", wb=wb, excel_app=excel_app)
+
+    # # # ファイルを閉じる
+    # ecu.close_excel_file(wb)
+
+    # # # エクセルアプリの終了
+    # ecu.quit_excel_app(excel_app=excel_app)
+
+
+if __name__ == '__main__':
+    os.chdir(os.path.dirname(os.path.abspath(__file__)))
+    main_func()
diff --git a/2020/027_excel_control_by_python/excel_control_utility.py b/2020/027_excel_control_by_python/excel_control_utility.py
index 9f0a96ff..3f065697 100644
--- a/2020/027_excel_control_by_python/excel_control_utility.py
+++ b/2020/027_excel_control_by_python/excel_control_utility.py
@@ -284,6 +284,15 @@ def get_range(ws, st_pos=(0, 0), row_num=4, col_num=8):
     -------
     ???
         An Excel Range
+
+    Examples
+    --------
+    >>> row_num = 4
+    >>> col_num = 8
+    >>> cell_range = ecu.get_range(
+    ...      ws, st_pos=(2, 1), row_num=row_num, col_num=col_num)
+    >>> data = np.arange(row_num * col_num).reshape((row_num, col_num))
+    >>> cell_range.Value = data
     """
     st_cell = get_cell(ws, pos=st_pos)
     ed_cell = get_cell(ws, pos=(st_pos[0] + row_num - 1, st_pos[1] + col_num - 1))
@@ -301,7 +310,7 @@ def change_row_height(ws, height, st_pos_row, row_num):
     height : int
         height of the raw.
     st_pos_row : int
-        start position of row.
+        start position of row. 0 is the start coordinate.
     row_num : int
         number of row.
     """
@@ -325,7 +334,6 @@ def change_col_width(ws, width, st_pos_col, col_num):
     col_num : int
         number of columns.
     """
-    # range = f"{st_pos_col}:{ed_pos_col - 1}"
     cell_range = get_range(
         ws, st_pos=(0, st_pos_col), col_num=col_num)
     cell_range.ColumnWidth = width