I'm currently using two separate versions of IM across two computers (dev environment vs server), using 6.5.7-8 on my desktop and 6.6.4-0 (the latest right now). Against a PNG with transparency, I use the -colors option to reduce the colours down and in 6.5.7-8, the transparency is maintained correctly, but in 6.6.4-0, the alpha appears to get stripped.
The command is:
as the original image has 192 colours. My aim is to end up with an indexed PNG, to save on filesize, and the earlier IM works correctly and maintains the alpha, whilst the latter does not. My resultant images are below.
Original image:
IM 6.5.7-8 result:
IM 6.6.4-0 result:
I've attempted going through the change log, but it doesn't mean much to me unfortunately. Is this a bug and/or else how can I maintain the same result?
Thanks in advance.