Untested but the Image::Magick attribute that controls color depth, is "depth". Since it is per RGB component, a depth of 8 is 24 bit. So a line like 
$image->Set(depth=>8);

[download]
should patch things up. (Hopefully)

In reply to Re: png to bmp 24 by nmcfarl
in thread png to bmp 24 by Anonymous Monk

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