Legacy ImageMagick Discussions Archive

Thanks Fred, your reply is very helpful.

Following your instructions, I did these things to make it work.
1. my previous version was too old, the default one from Ubuntu
2. I installed the new version according to the line: http://www.imagemagick.org/script/install-source.php#unix
but there are ...

I have several png images and I wanna to merge them together by using convert command.
The following command line gives me a transparent image.
convert *.png -evaluate-sequence mean merged_image.png

If I use median or max instead of 'mean', there is a non-transparent image. But 'min' and 'mean ...