On Wed, Apr 8, 2015 at 12:48 PM, Jay Dee <[email protected]> wrote:
> $ convert -resize 25% dragon.gif
> convert: no images defined `dragon.gif' @
> error/convert.c/ConvertImageCommand/3210.

  Yep, this is simply because you don't know how to use convert. The
file to read should be placed before the operations (resize) and the
file to write at the end. Here, converts just tells you that it won't
generate dragon.gif, since there is no image. Try

convert dragon.gif -resize 25% dragon.resized.gif

      Vincent


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