After getting loads of emails, I’ve put the RMagick back in the plugin simple_captcha to provide various image styles and different level of distortions. The main reason for including it back is that people found it was hard for to apply their own styles.
Still the filesystem is not used in the plugin, neither for the secret code nor for the images. The generated image is directly rendered on the web page instead of storing on the server so that there won’t be any trouble for the distributed environment with clustered servers.

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