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Minor tweaks.

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This commit is contained in:
John Evans 2013-10-02 15:32:38 -04:00
commit c65ae274a9
4 changed files with 20 additions and 28 deletions
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16
docs/source/how_do_i.rst
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@ -3,7 +3,7 @@ How do I...?
------------
read the lowest resolution thumbnail?
... read the lowest resolution thumbnail?
=====================================
Printing the Jp2k object should reveal the number of resolutions (look in the
COD segment section), but you can take a shortcut by supplying -1 as the
@ -14,7 +14,7 @@ resolution level. ::
>>> j = glymur.Jp2k(file)
>>> thumbnail = j.read(rlevel=-1)
display metadata?
... display metadata?
=================
There are two ways. From the unix command line, the script *jp2dump* is
available. ::
@ -34,7 +34,7 @@ codestream box, only the main header is printed. It is possible to print
>>> print(j.get_codestream())
add XML metadata?
... add XML metadata?
=================
You can append any number of XML boxes to a JP2 file (not to a raw codestream).
Consider the following XML file `data.xml` : ::
@ -66,7 +66,7 @@ The **append** method can add an XML box as shown below::
>>> jp2.append(xmlbox)
>>> print(jp2)
add metadata in a more general fashion?
... add metadata in a more general fashion?
=======================================
An existing raw codestream (or JP2 file) can be wrapped (re-wrapped) in a
user-defined set of JP2 boxes. To get just a minimal JP2 jacket on the
@ -157,18 +157,18 @@ to add metadata, you should keep in mind that **wrap** produces a new JP2 file,
while **append** modifies an existing file and is currently limited to XML
boxes.
create an image with an alpha layer?
... create an image with an alpha layer?
====================================
OpenJPEG can create JP2 files with more than 3 components (requires
the development version), but by default, any extra components are
the development version of OpenJPEG), but by default, any extra components are
not described as such. In order to do so, we need to rewrap such
an image in a set of boxes that includes a channel definition box.
This example is based on SciPy example code found at
http://scipy-lectures.github.io/advanced/image_processing/#basic-manipulations .
Instead of a circular mask, however, we'll make it an ellipse since the source
image isn't square.
Instead of a circular mask we'll make it an ellipse since the source
image isn't square. ::
>>> import numpy as np
>>> import glymur