1. 通过添加字体文件（.ttf）来解决问题。将字体文件添加到Lambda函数中，并在python代码中进行调用，以确保正确的字体呈现。参考代码：

from pdf2image import convert_from_path import os

def lambda_handler(event, context): input_file = "/tmp/sample.pdf" output_file = "/tmp/sample.png"

# Add font file to function directory
os.system("cp /var/task/OpenSans-Regular.ttf /tmp/OpenSans-Regular.ttf")

# Convert PDF to image with specified font
images = convert_from_path(
    input_file,
    dpi=300,
    fmt='png',
    thread_count=1,
    output_folder=None,
    poppler_path=None,
    grayscale=False,
    size=None,
    paths_only=False,
    use_pdftocairo=True,
    strict=False,
    transparent=False,
    single_file=False,
    output_file=output_file,
    hide_annotations=False,
    colorspace=None,
    first_page=None,
    last_page=None,
    use_cropbox=False,
    jpegopt=None,
    pngopt=None,
    convert_rgb=None,
    output_folder=str(os.path.dirname(output_file)),
    timeout=None,
    check_extractable=True,
    flags=None,
    flavor=None,
    transparent_color=None,
    userpw=None,
    use_private=False,
    **kwargs)

return {
    'statusCode': 200,
    'body': 'Success',
    'headers': {
        'Content-Type': 'application/json'
    }
}

2. 可以尝试使用其他Python PDF转图像库，例如Wand或PyMuPDF。对于这些库，我们可以使用ImageMagick或Ghostscript等PDF处理工具来处理字体问题。需要一些额外的设置和调整，但是这提供了通用解决方案，可适用于其他PDF转图像操作。

参考代码：

!apt-get update !apt-get install -y libmagickwand-dev !apt-get install -y ghostscript

!pip install wand !pip install PyMuPDF

from wand.image import Image as WandImage from wand.color import Color as WandColor from wand.drawing import Drawing as WandDrawing

import fitz from io import BytesIO from PIL import Image as PILImage

def lambda_handler(event, context): input_file = "/tmp/sample.pdf" output_file = "/tmp/sample.png"

# Open PDF and read font data
with fitz.open(input_file) as doc:
    # Read all font names from PDF
    font_list = set(font.name for page in doc for font in page.font