[Image-SIG] transparency in palette mode ( "P" ) images

[Ivan Mincik]

On Tuesday 20 October 2009, you wrote:
> The problem seems to be that you set transparency=0 in your save.
> Leave it out ( im.save("out.png") ) and you should be fine.

Many thanks for reply, but I think You are not right. If I save without 'transparency=0' I will loose my transparent background at all - it will be black.  With  'transparency=0' I loose only transparency of my drawing, backround is OK.
My test image is here: http://gista.sk/dl/test.png


> If you just need to change the name try shutil.copy in the standard library.
> 
> On Mon, Oct 19, 2009 at 2:05 PM, Ivan Mincik <ivan.mincik at gmail.com> wrote:
> > Dear list,
> > I have PNG image in  palette mode, with 256 color palette. Every color
> > has different level of transparency.
> > For example:
> >  Color Table (RGB with 256 entries)
> >    0: 0,0,0,0
> >    1: 238,238,238,154
> >    2: 253,253,109,154
> >    3: 0,0,0,2
> >    4: 0,0,0,4
> >    5: 0,0,0,8
> >    6: 0,0,0,6
> >    7: 237,237,237,154
> >    8: 0,0,0,14
> >    9: 35,35,15,153
> >   10: 1,1,0,138
> >
> > I am trying just to open and save this image using PIL.
> > #!/usr/bin/python
> > import Image
> >
> > im = Image.open('test.png')
> > im.save('out.png', transparency=0 )
> >
> > After running this code, the resulting image is loosing transparency
> > information for each color and it is set to 255.
> >  Color Table (RGB with 256 entries)
> >    0: 0,0,0,0
> >    1: 238,238,238,255
> >    2: 253,253,109,255
> >    3: 0,0,0,255
> >    4: 0,0,0,255
> >    5: 0,0,0,255
> >    6: 0,0,0,255
> >    7: 237,237,237,255
> >    8: 0,0,0,255
> >    9: 35,35,15,255
> >   10: 1,1,0,255
> >
> > Is there any way how to save the image with exactly same palette as
> > original image ?
> >
> > For anybody wanting to look at this problem, You can download my test
> > image here:
> > http://gista.sk/dl/test.png
> >
> > Thanks,
> > Ivan
> > _______________________________________________
> > Image-SIG maillist  -  Image-SIG at python.org
> > http://mail.python.org/mailman/listinfo/image-sig
> >
> 



-- 
Ivan Mincik
Gista s.r.o.
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