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Editorial Team
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Asked: 2026-05-29T09:07:47+00:00

I have a working rails app that uses imagemagick commands on my local mac

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I have a working rails app that uses imagemagick commands on my local mac machine.

I recently deployed this app to an Ubuntu 11.10 server, made sure to do ‘sudo apt-get install imagemagick’. However it is missing a compose operator and option that my mac install have.

convert: unrecognized compose operator `ModulusSubtract’ @ error/convert.c/ConvertImageCommand/999.

and

compare: unrecognized option `-subimage-search’ @ error/compare.c/CompareImageCommand/839.

it appears my linux install of imagemagick doesnt have -compose ModulusSubtract or -subimage-search ?? Has anyone else had this issue?

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1 Answer

  1. Editorial Team

    What do convert --version and compare --version give you?

    The -subimage-search option only came in around 6.6.3-6 (see changelogs).

    The ModulusSubtract in compose only came in 6.6.1-6, and according to that changelog it was previously named ‘Subtract’ and ‘Add’, so you can use ‘-compose Subtract’ instead.

    You might need to install a newer version yourself (repository versions of software notoriously lag behind the actual versions).

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