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# app/image_utils.py
from PIL import Image, ImageDraw, ImageFont
import numpy as np
def add_watermark(image_array: np.ndarray, text: str, confidence: float) -> Image.Image:
"""
Adds a large, prominent, and professional-looking watermark to an image.
"""
image = Image.fromarray(image_array).convert("RGBA")
txt_overlay = Image.new("RGBA", image.size, (255, 255, 255, 0))
draw = ImageDraw.Draw(txt_overlay)
# Define watermark properties
is_pneumonia = (text == "PNEUMONIA")
box_color = (220, 53, 69, 200) if is_pneumonia else (25, 135, 84, 200) # Red/Green with higher opacity
text_color = (255, 255, 255, 255)
# --- FONT FIX: Make font size proportional and larger ---
try:
# On many systems (including HF Spaces), Arial is available.
font_path = "arialbd.ttf"
font_size = int(image.height / 7) # Made font significantly larger
font = ImageFont.truetype(font_path, font_size)
except IOError:
print(f"Font '{font_path}' not found, using default. Watermark quality may be lower.")
# Fallback if font is not on the system
font_size = int(image.height / 7)
try:
# Try a generic sans-serif font
font = ImageFont.truetype("DejaVuSans-Bold.ttf", font_size)
except IOError:
font = ImageFont.load_default()
# Define text
text_to_draw = f"{text}\n{confidence:.1%}"
# --- POSITIONING FIX: Center the watermark ---
try:
# Use getbbox for modern Pillow versions to get precise text dimensions
left, top, right, bottom = draw.textbbox((0, 0), text_to_draw, font=font)
text_width = right - left
text_height = bottom - top
except AttributeError:
# Fallback for older Pillow versions
text_width, text_height = draw.textsize(text_to_draw, font=font)
x = (image.width - text_width) / 2
y = (image.height - text_height) / 2
position = (x, y)
# Add padding to the background box
padding = font_size / 4
box_position = [
x - padding,
y - padding,
x + text_width + padding,
y + text_height + padding
]
# Draw the rectangle and the text
draw.rectangle(box_position, fill=box_color)
draw.text(position, text_to_draw, font=font, fill=text_color, align="center")
watermarked_image = Image.alpha_composite(image, txt_overlay)
return watermarked_image.convert("RGB")
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