解决批量图像处理过程中：OSError: image file is truncated

本文主要是介绍解决批量图像处理过程中：OSError: image file is truncated，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1：问题描述：

在进行图像处理过程中，批量读取图像进行处理的时候，遇到中间某个图像损坏，导致处理无法进行下去。并伴随着OSError: image file is truncated的异常。

字面自已，图像被截断，损坏，无法完成正常的读取。

---

2：问题分析

错误发生的代码位于python的site-package文件夹内，代码文件为 ImageFile.py 。具体代码：

    
import io
import struct
import sys
import warningsfrom . import Image
from ._util import isPathMAXBLOCK = 65536SAFEBLOCK = 1024 * 1024LOAD_TRUNCATED_IMAGES = False
"""Whether or not to load truncated image files. User code may change this."""ERRORS = {-1: "image buffer overrun error",-2: "decoding error",-3: "unknown error",-8: "bad configuration",-9: "out of memory error",
}
"""Dict of known error codes returned from :meth:`.PyDecoder.decode`."""        try:# FIXME: This is a hack to handle TIFF's JpegTables tag.prefix = self.tile_prefixexcept AttributeError:prefix = b""for decoder_name, extents, offset, args in self.tile:decoder = Image._getdecoder(self.mode, decoder_name, args, self.decoderconfig)try:seek(offset)decoder.setimage(self.im, extents)if decoder.pulls_fd:decoder.setfd(self.fp)status, err_code = decoder.decode(b"")else:b = prefixwhile True:try:s = read(self.decodermaxblock)except (IndexError, struct.error) as e:# truncated png/gifif LOAD_TRUNCATED_IMAGES:breakelse:raise OSError("image file is truncated") from eif not s:  # truncated jpegif LOAD_TRUNCATED_IMAGES:breakelse:raise OSError("image file is truncated "f"({len(b)} bytes not processed)")

从上述代码可以看出，

LOAD_TRUNCATED_IMAGES = False，此时如果读取的图像损坏，则会执行如下代码：

                     while True:try:s = read(self.decodermaxblock)except (IndexError, struct.error) as e:# truncated png/gifif LOAD_TRUNCATED_IMAGES:breakelse:raise OSError("image file is truncated") from eif not s:  # truncated jpegif LOAD_TRUNCATED_IMAGES:breakelse:raise OSError("image file is truncated "f"({len(b)} bytes not processed)")

        从这段代码可以看出，只要LOAD_TRUNCATED_IMAGES为False，则总会抛出OSError: image file is truncated的异常。这就是无法跳过损坏图片进行继续处理的原因。

---

3：解决办法：   

from PIL import ImageFile
ImageFile.LOAD_TRUNCATED_IMAGES = True

如果想要跳过损坏图像进行接下来的图像操作，则需要将LOAD_TRUNCATED_IMAGES的值置为True。具体操作在代码开头添加如上两行代码。

这篇关于解决批量图像处理过程中：OSError: image file is truncated的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---