Revision: 5306
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=5306&view=rev
Author: jdh2358
Date: 2008-05-29 13:17:32 -0700 (Thu, 29 May 2008)
Log Message:
-----------
imread via pil now returns lumininance or rgb if possible
Modified Paths:
--------------
branches/v0_91_maint/API_CHANGES
branches/v0_91_maint/CHANGELOG
branches/v0_91_maint/lib/matplotlib/image.py
Modified: branches/v0_91_maint/API_CHANGES
===================================================================
--- branches/v0_91_maint/API_CHANGES 2008-05-29 18:25:58 UTC (rev 5305)
+++ branches/v0_91_maint/API_CHANGES 2008-05-29 20:17:32 UTC (rev 5306)
@@ -1,3 +1,8 @@
+ matplotlib.image.imread now no longer always returns RGBA -- if
+ the image is luminance or RGB, it will return a MxN or MxNx3 array
+ if possible. Also uint8 is no longer always forced to float.
+
+
0.91.2 Released
For csv2rec, checkrows=0 is the new default indicating all rows
Modified: branches/v0_91_maint/CHANGELOG
===================================================================
--- branches/v0_91_maint/CHANGELOG 2008-05-29 18:25:58 UTC (rev 5305)
+++ branches/v0_91_maint/CHANGELOG 2008-05-29 20:17:32 UTC (rev 5306)
@@ -1,3 +1,8 @@
+2008-05-29 matplotlib.image.imread now no longer always returns RGBA
+ -- if the image is luminance or RGB, it will return a MxN
+ or MxNx3 array if possible. Also uint8 is no longer always
+ forced to float.
+
2008-05-29 Implement path clipping in PS backend - JDH
2008-05-29 Fixed two bugs in texmanager.py:
Modified: branches/v0_91_maint/lib/matplotlib/image.py
===================================================================
--- branches/v0_91_maint/lib/matplotlib/image.py 2008-05-29 18:25:58 UTC
(rev 5305)
+++ branches/v0_91_maint/lib/matplotlib/image.py 2008-05-29 20:17:32 UTC
(rev 5306)
@@ -607,11 +607,15 @@
"""
return image file in fname as numpy array
- Return value is a MxNx4 array of 0-1 normalized floats
+ return value is a numpy array. For grayscale images, the return
+ array is MxN. For RGB images, the return value is MxNx3. For
+ RGBA images the return value is MxNx4
matplotlib can only read PNGs natively, but if PIL is installed,
- it will use it to load the image and return an RGBA if possible
+ it will use it to load the image and return an array (if possible)
which can be used with imshow
+
+ TODO: support RGB and grayscale return values in _image.readpng
"""
def pilread():
@@ -639,15 +643,39 @@
def pil_to_array( pilImage ):
+ """
+ load a PIL image and return it as a numpy array of uint8. For
+ grayscale images, the return array is MxN. For RGB images, the
+ return value is MxNx3. For RGBA images the return value is MxNx4
+ """
+ def toarray(im):
+ 'return a 1D array of floats'
+ x_str = im.tostring('raw',im.mode,0,-1)
+ x = npy.fromstring(x_str,npy.uint8)
+ return x
+
if pilImage.mode in ('RGBA', 'RGBX'):
- im = pilImage # no need to convert images in rgba format
+ im = pilImage # no need to convert images
+ elif pilImage.mode=='L':
+ im = pilImage # no need to luminance images
+ # return MxN luminance array
+ x = toarray(im)
+ x.shape = im.size[1], im.size[0]
+ return x
+ elif pilImage.mode=='RGB':
+ #return MxNx3 RGB array
+ im = pilImage # no need to RGB images
+ x = toarray(im)
+ x.shape = im.size[1], im.size[0], 3
+ return x
+
else: # try to convert to an rgba image
try:
im = pilImage.convert('RGBA')
except ValueError:
raise RuntimeError('Unknown image mode')
- x_str = im.tostring('raw',im.mode,0,-1)
- x = npy.fromstring(x_str,npy.uint8)
+ # return MxNx4 RGBA array
+ x = toarray(im)
x.shape = im.size[1], im.size[0], 4
return x
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