我需要一种从python中的String轻松编写压缩TIFF文件的方法.我已经看过Python Imaging Library PIL了,但是我需要编写一个非常特定的TIFF格式,并且PIL目前仅支持未压缩.我需要编写一个LZW压缩的带条纹TIFF,其中仅包含一行简单的文本.我宁愿不必从头开始编写某些东西,但是如果我这样做了.

解决方法:

我过去使用过此代码,因此可以说它有效.该脚本来自1997年,并且PIL尚未实现压缩的TIFF写入.

# 
# use "tiffcp" to write compressed TIFF files.
#
# fredrik lundh (may 13, 1997)
#

import os, tempfile

# install standard driver
import Image, TiffImagePlugin 

LZW      = "lzw"
ZIP      = "zip"
JPEG     = "jpeg"
PACKBITS = "packbits"
G3       = "g3"
G4       = "g4"

def _save(im, fp, filename):

    # check compression mode
    try:
    compression = im.encoderinfo["compression"]
    except KeyError:
    # use standard driver
    TiffImagePlugin._save(im, fp, filename)
    else:
    # compress via temporary file
    if compression not in (LZW, ZIP, JPEG, PACKBITS, G3, G4):
        raise IOError, "unknown compression mode"
    file = tempfile.mktemp()
    im.save(file, "TIFF")
    os.system("tiffcp -c %s %s %s" % (compression, file, filename))
    try: os.unlink(file)
    except: pass

Image.register_save(TiffImagePlugin.TiffImageFile.format, _save)

if __name__ == "__main__":
    # test
    im = Image.open("/usr/iv/tip/images/lenna.ppm")
    im = im.point(lambda v: v >= 128 and 255, "1")
    im.save("lenna.tif", compression=G4)

该代码(附加)仅增加了使用标准PIL库编写压缩TIFF的功能,因此,如果您已将文本写入PIL Image对象,则应该很容易实现.