Make Icons from Commandline

[Jesse_hz]

I really need a commandline program that can produce 32bit icons and Vista Icons from PNG files. It has to be a commandline program since I need to use it in a batch script.

I've tried png2ico, but it can't produce icons with more than 256 colors and a 128x128 resolution. I then tried IconBox/ToYcon, but it didn't work from the commandline.

So could anyone recommend a program like png2ico that can make 32bit icons?

Edit: Tried XnView, but the transparency looked screwed up in the icons it made and it didn't work from a commandline.
Edit: Found an application called "Any to Icon", it worked great except it can't make icons for Vista (256x256 with PNG compression) so I'm still searching...

 

[LNCPapa]

Does it need to be a windows/dos command line program? I think ImageMagick on *nix can do it. I do something similar but not for icons. I think there is even a windows version of ImageMagick and it's GPL.

 

[Nodsu]

ImageMagick or NetPBM are my recommendations too. Both should have Windows versions and you could always use Cygwin too..

 

[Jesse_hz]

ImageMagick completely screws up the transparency of every image that I throw at it and finding help on google doesn't seem to work. Even a simple "convert a.png a.jpg" doesn't work! If I can't get it to work I'll have a go at NetPBM.
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Edit: Could someone please tell me what command I should use to tell IM that my png has an an alpha channel and how to make it copy the alpha to the icon?