Hello Lukas,
could be that you found a memleak somewhere in PIL.
Maybe try to add some /del() /to force cleanup of the images - i'm not
that sure at the moment but i remember i somewhen have read something
somewhere about the need to use del(image) to force a correct cleanup in
a special case.
In case you're curious if i'm right try this version which cleans used
stuff explicitly via del().
also while looking at it i'm not that sure why you don't check the
extension by checking against /a[-4:] == ".png" /which i feel like a bit
more readable compared to your if condition.
Do you want to stop your code from processing files with a "." in the
name (like 'mypic 02.05.2007.png') ?
Gregor
def start_image_crush(bla, path, files):
os.chdir(path)
print '\nACTUAL DIRECTORY: ' + path + '\n'
for a in files:
# directory and file filter
if string.find(a,'.') > 0 and string.split(a,'.')[1]=='png' and
len(string.split(a,'.'))==2:
print 'Trying '+ a
im = Image.open(a)
if im.mode!='P':
print '.....processing'
if im.mode=='RGBA':
print "Warning, converting alpha transparency to 1-bit
transparency"
al = im.split()[3]
nal = Image.eval(al, quantize_and_invert)
del(al)
colors=255
else:
nal = None
colors=256
if im.mode!='RGB':
nim = im.convert('RGB')
else:
nim = im
del(im)
try:
im=nim.convert('P', palette=Image.ADAPTIVE, colors=colors)
except ValueError, e:
print 'Python memusage: ' + str( memusage() ) + ' !!!'
raise e
del(nim)
if nal:
im.paste(255,None,nal)
del(nal)
im.save(string.split(a,'.')[0]+'.png',optimize=1,
transparency=255)
else:
print 'Image still converted. No processing !!!'
del(im)
Lukas Orsin schrieb:
Thanks for answers.
I am sure no image is broken. If I run my program once again,
previously stopped image is processed with no error and no exception.
I tested conversion a few times with many little images on two
mashines (both 32bit Win 2003 server) and it crashed after allocation
50 - 60 MB of memory.
A preliminary test on 64bit Win 2008 server ended well with 200,000
converted images at memory allocation 250 MB in the end.
We think problem takes about memory allocation at mass conversion.
My script is attached.
(usage: python to8bit_folders_upgrade.py c:\temp\images)
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