diff --git a/cogs/ccolor.py b/cogs/ccolor.py
index 78dfd91..2445fc8 100644
--- a/cogs/ccolor.py
+++ b/cogs/ccolor.py
@@ -1,15 +1,53 @@
 import io
 import random
+import struct
+import zlib
 
 import discord
 from discord import app_commands
 from discord.ext import commands
-from PIL import Image, ImageColor, ImageDraw
 
 from utils.util import create_codeblock, create_embed
 
 
-def randhex():
+def create_image(width: int, height: int, color_code: str) -> io.BytesIO:
+    if not (isinstance(width, int) and width > 0 and isinstance(height, int) and height > 0):
+        raise ValueError("Width and Height must be positive integers")
+    if not color_code.startswith('#') or len(color_code) not in (7, 9):
+        raise ValueError("Color code must be in the format #RRGGBB or #RRGGBBAA")
+
+    # Parse the color code
+    r = int(color_code[1:3], 16)
+    g = int(color_code[3:5], 16)
+    b = int(color_code[5:7], 16)
+    a = int(color_code[7:9], 16) if len(color_code) == 9 else 255
+
+    # PNG file signature
+    png_signature = b'\x89PNG\r\n\x1a\n'
+
+    # IHDR chunk
+    ihdr_data = struct.pack(">IIBBBBB", width, height, 8, 6, 0, 0, 0)  # Width, Height, Bit depth, Color type, Compression, Filter, Interlace
+    ihdr_crc = zlib.crc32(b'IHDR' + ihdr_data) & 0xffffffff
+    ihdr_chunk = struct.pack(">I", len(ihdr_data)) + b'IHDR' + ihdr_data + struct.pack(">I", ihdr_crc)
+
+    # IDAT chunk
+    row = b'\x00' + struct.pack("BBBB", r, g, b, a) * width
+    idat_data = b''.join([row for _ in range(height)])
+    compressed_idat_data = zlib.compress(idat_data)
+    idat_crc = zlib.crc32(b'IDAT' + compressed_idat_data) & 0xffffffff
+    idat_chunk = struct.pack(">I", len(compressed_idat_data)) + b'IDAT' + compressed_idat_data + struct.pack(">I", idat_crc)
+
+    # IEND chunk
+    iend_data = b''
+    iend_crc = zlib.crc32(b'IEND' + iend_data) & 0xffffffff
+    iend_chunk = struct.pack(">I", len(iend_data)) + b'IEND' + iend_data + struct.pack(">I", iend_crc)
+
+    png_data = png_signature + ihdr_chunk + idat_chunk + iend_chunk
+
+    return io.BytesIO(png_data)
+
+
+def randhex() -> str:
     return hex(random.randint(0x00, 0xFF))
 
 
@@ -23,20 +61,16 @@ async def preview(self, interaction: discord.Interaction, color: str):
         try:
             c_color = int(color.replace("#", ""), base=16)
             cc_color = ImageColor.getrgb(color)
-            image = Image.new("RGB", (1024, 300), color=cc_color)
-            d = ImageDraw.Draw(image)
-            d.rectangle((0, 0, 1024, 300), fill=cc_color)
+            image = create_image(1024, 300, color)
 
-            data = io.BytesIO()
-            image.save(data, format="PNG")
-            file = discord.File(io.BytesIO(data.getvalue()), filename="color.png")
+            file = discord.File(image, filename="color.png")
 
             embed = discord.Embed(
                 color=c_color, title="色のプレビュー", description=color.upper()
             )
             embed.set_image(url="attachment://color.png")
             embed.add_field(
-                name="10進数表記", value=create_codeblock(f"{int(str(c_color), base=10)}")
+                name="10進数表記", value=create_codeblock(f"{c_color}")
             )
             embed.add_field(
                 name="RGB",
@@ -52,23 +86,19 @@ async def preview(self, interaction: discord.Interaction, color: str):
     @app_commands.command(name="random", description="カラーコードをランダムに出力し行います")
     async def random(self, interaction: discord.Interaction):
         try:
-            color = "#" + randhex()[2:] + randhex()[2:] + randhex()[2:]
+            color = "#" + randhex()[2:].zfill(2) + randhex()[2:].zfill(2) + randhex()[2:].zfill(2)
             c_color = int(color.replace("#", ""), base=16)
             cc_color = ImageColor.getrgb(color)
-            image = Image.new("RGB", (1024, 300), color=cc_color)
-            d = ImageDraw.Draw(image)
-            d.rectangle((0, 0, 1024, 300), fill=cc_color)
+            image = create_image(1024, 300, color)
 
-            data = io.BytesIO()
-            image.save(data, format="PNG")
-            file = discord.File(io.BytesIO(data.getvalue()), filename="color.png")
+            file = discord.File(image, filename="color.png")
 
             embed = discord.Embed(
                 color=c_color, title="色のプレビュー", description=color.upper()
             )
             embed.set_image(url="attachment://color.png")
             embed.add_field(
-                name="10進数表記", value=create_codeblock(f"{int(str(c_color), base=10)}")
+                name="10進数表記", value=create_codeblock(f"{c_color}")
             )
             embed.add_field(
                 name="RGB",
diff --git a/requirements.txt b/requirements.txt
index aa43fbe..f4b3769 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,6 @@
 discord
 pydantic
 jishaku
-Pillow
 markdownify
 aiohttp
 aiofiles
@@ -9,4 +8,4 @@ tqdm
 pygit2
 pyyaml
 brigadier.py
-lorem
\ No newline at end of file
+lorem