使用 PIL 保存模式错误将 png 转换为 pdf

Question

我正在尝试将 png 文件转换为 pdf 文件。PIL似乎是这样做的方法，但我cannot save mode RGBA在运行时遇到错误 ( )

代码：

import os
import PIL
from PIL import Image

path = 'E:\path_to_file'
filename = '15868799_1.png'
fullpath_filename = os.path.join(path, filename)
im = PIL.Image.open(fullpath_filename)
newfilename = '15868799.pdf'
newfilename_fullpath = os.path.join(path, newfilename)
PIL.Image.Image.save(im, newfilename_fullpath, "PDF", resoultion=100.0)

错误：

 File "C:\Python\lib\site-packages\PIL\PdfImagePlugin.py", line 148, in _save
 raise ValueError("cannot save mode %s" % im.mode)
 ValueError: cannot save mode RGBA

Answer 1

您需要先将PNG 从 RGBA 转换为 RGB。

示例代码：

from PIL import Image

PNG_FILE = 'E:\path_to_file\15868799_1.png'
PDF_FILE = 'E:\path_to_file\15868799.pdf'

rgba = Image.open(PNG_FILE)
rgb = Image.new('RGB', rgba.size, (255, 255, 255))  # white background
rgb.paste(rgba, mask=rgba.split()[3])               # paste using alpha channel as mask
rgb.save(PDF_FILE, 'PDF', resoultion=100.0)