【发布时间】：2021-02-21 02:04:58
【问题描述】：
我创建了一个批处理作业，它在文件夹中打开 .TIFF 文件，调整它们的大小，将它们转换为 .PNG 文件，然后将它们保存在不同的文件夹中。批处理作业运行良好，图片得到正确处理，但在某些特定图片（我可以作为普通 .TIFF 文件打开）时，该过程停止并显示以下错误日志：
---------------------------------------------------------------------------
OSError Traceback (most recent call last)
<ipython-input-3-499452368347> in <module>
47 target_size = (target_x, target_y)
48 print("Image gets converted from size " + str(img_size) + " to " + str(target_size))
---> 49 resized_image = image.resize(target_size, Image.BICUBIC)
50
51 # Save the image as a PNG to the target_dir
C:\EigeneProgramme\Python38-64\lib\site-packages\PIL\Image.py in resize(self, size, resample, box, reducing_gap)
1897
1898 if self.mode in ["LA", "RGBA"]:
-> 1899 im = self.convert(self.mode[:-1] + "a")
1900 im = im.resize(size, resample, box)
1901 return im.convert(self.mode)
C:\EigeneProgramme\Python38-64\lib\site-packages\PIL\Image.py in convert(self, mode, matrix, dither, palette, colors)
891 """
892
--> 893 self.load()
894
895 if not mode and self.mode == "P":
C:\EigeneProgramme\Python38-64\lib\site-packages\PIL\TiffImagePlugin.py in load(self)
1085 def load(self):
1086 if self.tile and self.use_load_libtiff:
-> 1087 return self._load_libtiff()
1088 return super().load()
1089
C:\EigeneProgramme\Python38-64\lib\site-packages\PIL\TiffImagePlugin.py in _load_libtiff(self)
1189
1190 if err < 0:
-> 1191 raise OSError(err)
1192
1193 return Image.Image.load(self)
OSError: -2
这个错误接缝真的不是不言自明，我在网上找不到合适的解决方案。有人可以帮忙吗？
这是完整（相关）代码：
from PIL import Image
import os
# The directory which should be converted
source_dir = './Edge_Bands_Scan_Sorted/'
# The directory to which the converted files should be stored
target_dir = './Edge_Bands_Scan_Sorted_PNGs/'
# Create the target dir, if it does not exist already
if not os.path.exists(target_dir):
os.makedirs(target_dir)
count = 0
valid = 0
# Iterate through all the files in the source_dir-directory
for subdir, dirs, files in os.walk(source_dir):
for file in files:
# Check if file is a TIFF-File:
#if(file[-5:] == '.tiff' or file[-5:] == '.TIFF' ):
if file.lower().endswith(".tiff"):
file_path = os.path.join(subdir, file)
#Print list of all files
#print(file_path)
# Extract edge band pattern name from the filepath
# Get postion of last backslash and only get the text after this backslash
last_backslash_position = file_path.rfind("\\")
after_last_backslash = file_path[last_backslash_position + 1:]
# Remove file ending
after_last_backslash_without_ending = after_last_backslash[:-5]
# Only the text before the first underscore is the REHAU Color Code
first_underscore_position = after_last_backslash_without_ending.find("_")
color_code = after_last_backslash_without_ending[:first_underscore_position]
# open the files to write
file = open(list_path, 'a')
error_file = open(error_list_path, 'a')
# Check if the colorcode is already converted
if not color_code in converted_color_codes_list:
try:
# Process the image
print("Loading image [{}] {}".format(count, file_path))
# Use PIl to load the image - there are problems with some images
image = Image.open(file_path)
# Get the image size
img_size = image.size
img_x = image.size[0]
img_y = image.size[1]
# Target width of the image
target_x = 1000
target_y = int(img_y * target_x / img_x)
target_size = (target_x, target_y)
print("Image [{}] gets converted from size {} to {} ".format( count, str(img_size), str(target_size)))
resized_image = image.resize(target_size, Image.BICUBIC)
# Save the image as a PNG to the target_dir
new_path = target_dir + color_code + '.png'
print("The converted image [{}] gets saved to path {}".format( count, new_path))
resized_image.save(new_path, "PNG", optimize=True, compress_level=6)
# If successful, add the color code to the list
# First add a new line
if existing_list:
file.write("\n")
# Then add the color code
file.write(color_code)
existing_list = True
valid += 1
except OSError:
print("ERROR: Image [{}] at path {} could not be processed".format (count, file_path))
# If there occurs an error while processing, save the image name and path to the file
if existing_error_list:
error_file.write("\n")
# Then add the color code
error_file.write(color_code + " - " + file_path)
existing_error_list = True
else:
#Handle duplicate files
print("DUPLICATE: Image [{}] at path {} with color code {} is already converted".format(count, file_path, color_code))
count += 1
# Close the file access again
error_file.close()
file.close()
else:
#Ignore other filetypes
break
print("{}/{} were successfully converted".format(valid, count))
该文件夹在嵌套子目录系统中包含大约 2100 个 .tiff 图像。其中 149 个没有得到正确处理，但另一个得到了很好的处理。我看不出正确处理的图片和导致错误的图片有什么区别。
这是正确处理的图片的示例路径：
./Edge_Bands_Scan_Sorted/Wooden\TIFF\W_E_B_NG\1475B_W_E_B_NG.TIFF
这是未正确处理的图片的示例路径：./Edge_Bands_Scan_Sorted/Wooden\TIFF\W_E_B_NG\3200B_W_E_B_NG.TIFF
【问题讨论】：
-
OSError 2 表示文件名不存在。
-
不确定您是否意识到，但您不需要任何 Python。您可以使用 ImageMagick 在终端中执行此操作，例如
magick mogrify -resize 1024x768 -path OUTPUTDIRECTORY -format PNG *.TIFF -
感谢您的回答。文件存在是因为我使用 python 创建了一个文件列表，然后循环遍历文件
for subdir, dirs, files in os.walk(source_dir): for file in files: # Check if file is a TIFF-File: #if(file[-5:] == '.tiff' or file[-5:] == '.TIFF' ): if file.lower().endswith(".tiff"): file_path = os.path.join(subdir, file) ... image = Image.open(file_path) ... resized_image = image.resize(target_size, Image.BICUBIC)出于某种原因，可以加载图像，当我尝试调整图像大小时出现错误 -
然后请显示您的代码，以及您正在处理的文件的长列表。
-
@MarkSetchell 谢谢我编辑了问题并添加了代码
标签： python python-imaging-library png tiff