How to convert bmp to png and keep alpha channel?

Question

I have a p.bmp file, it look like has a alpha channel. so i try to convert it to png file by use imagemagick.

But whatever i try, the png file cannot keep the alpha channel:

The p.bmp file:

convert p.bmp p.png

_{(source: meteor.com)}

convert p.bmp png24:p24.png

_{(source: meteor.com)}

convert p.bmp png32:p32.png

_{(source: meteor.com)}

Could anyone help me to find the alpha data in the p.bmp file, and convert it to png file?

Answer 1

You discovered a bug in ImageMagick. This will be fixed in ImageMagick 6.8.7-9. I am one of the developers for ImageMagick and I just committed the fix to our SVN repository (http://trac.imagemagick.org/changeset/13867).