Split multi-page tiff with python

Question

What's the best way to split a multi-page TIFF with python? PIL doesn't seem to have support for multi-page images, and I haven't found an exact port for libtiff for python. Would PyLibTiff be the way to go? Can somebody provide a simple example of how I could parse multiple pages within a TIFF?

Answer 1

A project (disclosure: which I am one of the main authors, this question was one of the things that prompted me to work on it) which makes this is easy is PIMS. The core of PIMS is essentially a cleaned up and generalized version of the following class.

A class to do basic frame extraction + simple iteration.

import PIL.Image
class Stack_wrapper(object):
    def __init__(self,fname):
        '''fname is the full path '''
        self.im  = PIL.Image.open(fname)

        self.im.seek(0)
        # get image dimensions from the meta data the order is flipped
        # due to row major v col major ordering in tiffs and numpy
        self.im_sz = [self.im.tag[0x101][0],
                      self.im.tag[0x100][0]]
        self.cur = self.im.tell()

    def get_frame(self,j):
        '''Extracts the jth frame from the image sequence.
        if the frame does not exist return None'''
        try:
            self.im.seek(j)
        except EOFError:
            return None

        self.cur = self.im.tell()
        return np.reshape(self.im.getdata(),self.im_sz)
    def __iter__(self):
        self.im.seek(0)
        self.old = self.cur
        self.cur = self.im.tell()
        return self

    def next(self):
        try:
            self.im.seek(self.cur)
            self.cur = self.im.tell()+1
        except EOFError:
            self.im.seek(self.old)
            self.cur = self.im.tell()
            raise StopIteration
        return np.reshape(self.im.getdata(),self.im_sz)

Answer 2

Imagemagick worked for me real good. Wnen splitting a tiff file, basically converting from tiff to tiff, one can use a flag to force saving output files to individual tiff files. To do that, try

convert input.tif output-%d.tif

The %d operator is a C-Printf style %d. So, if you need a 3 field running sequence, you can say

convert input.tif output-%3d.tif

and so on.. %d is replaced by "scene" number of the image. Now, scene numbers may or may not always start with 0 (or 1, if you want it that way). To setup a sequence the way you want, try

convert input.tif -scene 1 output-%3d.tif

This would start the sequence right from the count you provided.

convert -scene 1 input.TIF output-%d.TIF
output-1.TIF
output-2.TIF
output-3.TIF

Magick indeed!! :)

This link to documentation has more details. This works on my windows machine too.