boost sign image thickness and contrast

main.py

@@ -5,7 +5,7 @@ from random import choice
 from sys import argv
 from urllib.request import urlretrieve
 
-from PIL import Image, ImageDraw, ImageFont
+from PIL import Image, ImageDraw, ImageEnhance, ImageFilter, ImageFont
 
 zodiac_signs = [
     "Belier",
@@ -41,6 +41,23 @@ def get_path(image: str):
     return join(image_dir, f"{image.lower()}.png")
 
 
+def get_sign_image(image: str):
+    """Get sign image"""
+    sign_image = Image.open(get_path(image)).convert("RGBA")
+
+    # Add thickness
+    alpha = sign_image.split()[3]
+    bold_mask = alpha.filter(ImageFilter.MaxFilter())
+    sign_image.putalpha(bold_mask)
+
+    # Add contrast
+    enhancer = ImageEnhance.Contrast(sign_image)
+    enhanced_image = enhancer.enhance(2.0)
+
+    enhanced_image.thumbnail((100, 105))
+    return enhanced_image
+
+
 def create_horoscope_image(horoscope: dict[str, dict[str, str]]):
     """Generate horoscope images"""
     img_width, img_height = 1200, 425
@@ -54,8 +71,7 @@ def create_horoscope_image(horoscope: dict[str, dict[str, str]]):
 
     x, y = 10, 10
     for sign, prediction in horoscope.items():
-        sign_image = Image.open(get_path(sign)).convert("RGBA")
-        sign_image.thumbnail((100, 105))
+        sign_image = get_sign_image(sign)
         image.paste(sign_image, (x + 20, y), sign_image)
 
         # Sign text