[magick-users] convert png to bmp

[Tom Appermont]

Hi,

Trying to find a way to do the following with ImageMagick:

I have:
A collection of true color png images, with some colors semi-transparent.

I need:
1. The collection of images above converted to 8 bit bmp format, all 
sharing the same palette.
2. For every entry in the shared palette, the alpha value.


I was expecting to be able to use PNG8 in an intermediate step for the 
conversion process, but it seems ImageMagick can not handle multiple 
semi-transparent colors for PNG8 images 
(http://www.imagemagick.org/Usage/formats):

"PNG8 was defined by PhotoShop, not the PNG group. And while it can 
handle multiple semi-transparent colors, as well as a fully transparent 
color, IM assumes that it doesn't. This provides a way to force files to 
still be readable by Internet Explorer v6. The "Photoshop CS" program 
can read it."

Is there any other palette based format which includes alpha value in 
the palette?

Gr.
Tom