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Add compatibility for custom font sizes on bounding boxes #8894

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Add compatibility for custom font sizes on bounding boxes #8894

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acb2bbd
Add compatibility for custom font sizes on bounding boxes
mrdbourke Feb 3, 2025
ebea484
Merge branch 'main' into patch-1
NicolasHug Feb 20, 2025
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16 changes: 13 additions & 3 deletions torchvision/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@

import numpy as np
import torch

import PIL
from PIL import Image, ImageColor, ImageDraw, ImageFont


Expand Down Expand Up @@ -184,7 +186,9 @@ def draw_bounding_boxes(
font (str): A filename containing a TrueType font. If the file is not found in this filename, the loader may
also search in other directories, such as the `fonts/` directory on Windows or `/Library/Fonts/`,
`/System/Library/Fonts/` and `~/Library/Fonts/` on macOS.
font_size (int): The requested font size in points.
font_size (int): The requested font size in points. When using the default font (font=None),
this parameter requires PIL version 10.1.0 or higher. For older PIL versions, the default
font size will be used and a warning will be issued.
label_colors (color or list of colors, optional): Colors for the label text. See the description of the
`colors` argument for details. Defaults to the same colors used for the boxes.

Expand Down Expand Up @@ -230,8 +234,14 @@ def draw_bounding_boxes(

if font is None:
if font_size is not None:
warnings.warn("Argument 'font_size' will be ignored since 'font' is not set.")
txt_font = ImageFont.load_default()
try:
txt_font = ImageFont.load_default(size=font_size) # can set `size` parameter for default fonts as of PIL 10.1.0
except TypeError:
# Fallback for older PIL versions
warnings.warn(f"The current version of PIL ({PIL.__version__}) does not support setting the `size` parameter for default font. PIL version 10.1.0+ required.")
txt_font = ImageFont.load_default()
else:
txt_font = ImageFont.load_default()
else:
txt_font = ImageFont.truetype(font=font, size=font_size or 10)

Expand Down
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