Right now I'm trying to combine a series of images, 0001.png - 0016.png, into one big 4x4 file. Everything's combining fine except for one small detail - the source files have an alpha channel but the combined file does not. I've tried everything to get ImageMagick to save an alpha channel - this is my command line: But still, the image saves without an alpha channel. Can anyone help me with this? Thanks in advance!

Never mind, you were supposed to use 'transparent' instead of 'rgba( 0, 0, 0, 0 )'. Counter-intuitive...

Cheers!