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Editorial Team
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Asked: 2026-06-12T10:34:58+00:00

I’m building a Rails application where a user can upload an image which is

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I’m building a Rails application where a user can upload an image which is automatically cropped to a certain size, then they can choose an overlay which is exactly the same size as the cropped image.

What I want to do is composite or flatten the two images and save it as a single image – I’ve looked at the Image Magick documentation, but I can’t see how to apply the example they give:

composite -gravity center smile.gif rose: rose-over.png

to work with Paperclip.

Also, the example references two specific images, but I’m wondering how I can pass in a variable (the user uploaded image) instead?

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1 Answer

  1. Editorial Team

    I believe you want to use a paperclip processor.

    Here is the high level description:
    https://github.com/thoughtbot/paperclip#custom-attachment-processors

    Here is a gist example of using composite (recommended here https://github.com/thoughtbot/paperclip/issues/978):

    https://gist.github.com/708077

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