problems converting 32bit bmp with alpha to 32bit tga

[ricgreen1]

Whenever I try to convert a 32bit bmp with alpha to a 32bit tga with alpha, the alpha channel gets set to white instead of the alpha channel that is present in the source bmp. I tried all kinds of settings including

convert -matte -depth 32 c:\photo.bmp c:\photo.tga

and nothing seems to work

The bmp was created using photoshop cs3

Thanks!

[fmw42]

try

convert <inputimage> -channel RGBA -matte <outputimage>

[ricgreen1]

Unfortunately that gave me a white (blank) alpha as well. none of the alpha info ended up in the tga.

[fmw42]

The only other thing I can think of is to use -compose copy_opacity -composite

see
http://www.imagemagick.org/Usage/compose/#copyopacity