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Posted: 2006-06-21T15:18:24-07:00
by magick
To select a custom region as you describe you need a clip mask. The area you want to apply effects to should be opaque and the remaining area transparent. Use the -clip option to apply the clip mask followed by your effect.

Posted: 2006-06-21T15:59:01-07:00
by magick
The convert command accepts the -clip option. See for additional help.