Animated gif sizing issues

[rparker]

I'm hoping someone can help with this as it's starting to drive me crazy.

I produce a series of plots in postscript format.

I then convert them into PNG using this command

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mogrify -limit memory 2gb -limit map 32 -format png -page A1 -trim -density 300 filename.ps

This works perfectly and I'm left with a series of nice PNG files that have been trimmed to just the image contents (i.e. removing a lot of the blank space from the postscript page).

I then want to animate this sequence so do

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 convert -delay 20 *.png movie.gif

However, what this leaves me with is a gif file that is the wrong dimensions with a lot of vertical empty/transparent space.



Any ideas what I'm doing wrong? I've tried the trim, crop and page settings but nothing seems to work.

Thanks

Edit: Version: ImageMagick 6.4.3 2016-08-05 Q16 OpenMP http://www.imagemagick.org

[snibgo]

"-trim" often needs "+repage". Otherwise, it records canvas data, which is used when you make the gif.

[rparker]

Thanks, that solved it!