Possible bug trimming animation in IM 6.9.8.10 Q16

[fmw42]

I am getting inconsistent results running the following in IM 6.9.8.10 Q16 non-hdri. Sometimes the first one works and the second one does not. Other times it is the other way around. Other times both fail or both work. Note for IM 6, the -coalesce seems to be needed. Whereas in IM 7 it needs to be removed. See the recent IM 7 bug report.

Input:

Code: Select all

bgcolor=`convert oHBWq.gif[0] -format "%[pixel:u.p{0,0}]" info:`
convert -dispose previous -delay 10 -background "$bgcolor" oHBWq.gif -trim -layers TrimBounds -coalesce -layers optimize -loop 0 output6a2.gif

Code: Select all

convert -dispose previous -delay 10 -background "$bgcolor" oHBWq.gif -trim -layers TrimBounds -coalesce -layers optimize -loop 0 output6a3.gif

[magick]

Unfortunately, we cannot reproduce the problem under CentOS 7. We ran your command ten times and got consistent and expected results. We'll try under Mac OS X later this week.

[fmw42]

I would be interested to hear if anyone else can duplication this erratic behavior and make it fail.