Created
July 29, 2023 13:18
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Python: resize image to specified file size
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from io import BytesIO | |
from pathlib import Path | |
from PIL import Image | |
def resize_image(image_path: Path, max_size: int=3*1024*1024): | |
if image_path.stat().st_size <= max_size: | |
return image_path.read_bytes() | |
img = Image.open(image_path) | |
if img.format != 'PNG': | |
with BytesIO() as tmp_io: | |
img.save(tmp_io, format=img.format, quality=90, optimize=True) | |
if tmp_io.tell() <= max_size: | |
return tmp_io.getvalue() | |
new_img_value = None | |
width, height = img.size | |
l = 100 | |
r = int(height / 10) + 1 | |
# print(f'original size: {width, height}') | |
# print(f'file size: {image_path.stat().st_size/1024/1024:.2f}MB') | |
while l < r: | |
m = int((l + r) / 2) | |
new_height = m*10 | |
new_width = round(new_height / height * width) | |
new_img = img.resize((new_width, new_height), Image.LANCZOS) | |
with BytesIO() as tmp_io: | |
new_img.save(tmp_io, format=img.format, quality=90, optimize=True) | |
new_file_size = tmp_io.tell() | |
new_img_value = tmp_io.getvalue() | |
# print(f'new size: {new_width, new_height}') | |
# print(f'file size: {new_file_size/1024/1024:.2f}MB') | |
if abs(new_file_size - max_size) < 0.2*1024*1024: | |
break | |
if new_file_size < max_size: | |
l = m + 1 | |
else: | |
r = m | |
return new_img_value |
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