from PIL import Image, ImageDraw, ImageFont
 
image = Image.open('C:\Users\sunlight\Desktop\Houdini3D_icon.png')
width, height = image.size
 
draw = ImageDraw.Draw(image)
text = "A watermark"
 
font = ImageFont.truetype('C:\Users\sunlight\Desktop\arial.ttf', 12)
textwidth, textheight = draw.textsize(text, font)
 
# calculate the x,y coordinates of the text
margin = 5
x = width - textwidth - margin
y = height - textheight - margin
 
# draw watermark in the bottom right corner
draw.text((x, y), text, font=font)
 
image.save('cats.png')

Traceback (most recent call last):
  File "tool_1", line 9, in <module>
  File "C:\PROGRA~1\SIDEEF~1\HOUDIN~1.736\python27\lib\site-packages\PIL\ImageFont.py", line 260, in truetype
    return FreeTypeFont(font, size, index, encoding)
  File "C:\PROGRA~1\SIDEEF~1\HOUDIN~1.736\python27\lib\site-packages\PIL\ImageFont.py", line 140, in __init__
    self.font = core.getfont(font, size, index, encoding)
  File "C:\PROGRA~1\SIDEEF~1\HOUDIN~1.736\python27\lib\site-packages\PIL\ImageFont.py", line 42, in __getattr__
    raise ImportError("The _imagingft C module is not installed")
ImportError: The _imagingft C module is not installed

# Insert the path to PIL on your system before other entries in the search path, to make sure it's picked up first
import sys
sys.path.insert(0, "path to your Windows PIL installation")

# Import PIL modules
from PIL import Image, ImageDraw, ImageFont
...