ai to png: transparency issue

[Benoit DECHERF]

Hi, 

I need to convert adobe illustrator files to png and I lost the transparency of part of the image

The gs command executed is: 

gs -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r72x72"  "-sOutputFile=test.png" -ftest.ai

You can check the test file here: 

http://benoit.boceto.fr/test/test.ai

And the result: 

http://benoit.boceto.fr/test/test.html

The result I should have (made using photoshop):

http://benoit.boceto.fr/test/test-ps.html

As you can see, the whole image should be transparent.

I can't find a known bug on this issue. Or maybe the arguments are wrongs ?

The version 8.71 and 9.00 give me the same results.

Thanks