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More xmp blurbs.

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jevans 2014-02-01 13:21:51 -05:00
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docs/source/how_do_i.rst
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@ -268,14 +268,31 @@ Toolkit::
Where the Python XMP Toolkit can really shine, though, is when you are
converting an image from another format such as TIFF or JPEG into JPEG 2000.
For example::
For example, if you were to be converting the TIFF image found at
http://photojournal.jpl.nasa.gov/tiff/PIA17145.tif info JPEG 2000::
>>> import skimage.io
>>> image = skimage.io.imread('PIA17145.tif')
>>> from glymur import Jp2k
>>> jp2 = Jp2k('PIA17145.jp2', 'wb')
>>> jp2.write(image)
Next you can extract the XMP metadata.
>>> import requests
>>> r = requests.get('http://photojournal.jpl.nasa.gov/tiff/PIA17145.tif')
>>> with open('PIA17145.tif', 'wb') as fptr: fptr.write(r.content)
>>> from libxmp import XMPFiles
>>> xf = XMPFile()
>>> xf.open_file('PIA17145.tif')
>>> xmp = xf.get_xmp()
If you are familiar with TIFF, you can verify that there's no XMP tag in the
TIFF file, but the Python XMP Toolkit takes advantage of the TIFF header
structure to populate an XMP packet for you. If you were working with a JPEG
file with Exif metadata, that information would be included in the XMP packet
as well. Now you can append the XMP packet in a UUIDBox::
>>> import uuid
>>> the_uuid = uuid.UUID('be7acfcb-97a9-42e8-9c71-999491e3afac')
>>> box = glymur.jp2box.UUIDBox(uuid, str(xmp).encode())
>>> jp2.append(box)