On Tue, Oct 20, 2009 at 8:33 PM, Laura & Edward Cannon
<cannon.el@[...].com>  wrote:
>  Hm.. you seem to be right. One thing you might do is im =
>  Image.open("test.png").convert("RGBA") which seems to solve the
>  transparency problem, at the expense of a slightly larger image file.

No, even if using convert("RGBA") I get incorrect result :(


>  Looking closer I think that PIL seems to support only RGB palettes
>  rather than RGBA palettes as does the PNG specification. Converting to
>  RGBA would make editing work as expected, and would preserve all
>  transparency information. If you just need to move/rename the image,
>  try shutil.copy in the standard library.
>  Edward
> 
>  On Tue, Oct 20, 2009 at 9:53 AM, Ivan Mincik <ivan.mincik@[...].sk> wrote:
> > 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@[...].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@[...].org
> >> > http://mail.python.org/mailman/listinfo/image-sig
> >> >
> >>
> >
> >
> >
> > --
> > Ivan Mincik
> > Gista s.r.o.
> >
> 
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