Question : TRANSPARENT BACKGROUND color at RMagick does not work properly

Dear experts,

I write an rmagick application.
The application supposed to give a wave effect to an image.

Everything is worked properly at localhost, but not at production server.

The not working part is the BACKGROUND color that supposed to be TRANSPARENT turn to BLACK.
I tried to set the background color to "none" / "transparent", but give transparent effect at localhost. But not at production.

Could you kindly advice?

Answer : TRANSPARENT BACKGROUND color at RMagick does not work properly

if i were to guess, the problem seems to be your installation of ImageMagick / GraphicsMagick (to which RMagick binds)... are there any differences b/w your local and production servers? (OS, processor, etc...)?