Understanding ImageMagick's convert and translating to Ruby RMagick

Question

I\'m failing at translating the following PHP/ImageMagick code into Ruby RMagick (to make it more manageable for future users and to understand what it\'s really doing):

Answer 1

The php code you show (which really just sends the work to convert in a shell) does not check to see if the images have alpha channels, it just takes whatever file is given and turns it on. If it already had one there would be no file change, but convert is not being asked to make any decision based on the status, just go ahead and add the channel.