[magick-users] Montage Question

[Chris Howell]

Hi All,

I am a little confused. I created a montage'd image by saying.

montage *.png -background black -geometry 64x64 -tile 8x8 output.png.

I then said

convert output.png -transparent black -depth 8 output.rgba

What I want is I want the colour black to be transparent in the rgba or 
not show up. However when I did

 Indentify -verbose on my output.png The output told me that, my 
background colour in my otuput.png was white an the transparent colour 
was black.

whereas I need my background colour to be black in output.png.

Help
Chris