/usr/bin/imlib2_conv: invalid option -- '-'
Usage:
  imlib2_conv [OPTIONS] [ input-file output-file[.fmt] ]
    <fmt> defaults to jpg if not provided.

OPTIONS:
  -h            : Show this help
  -b 0xRRGGBB   : Render on solid background before saving
  -i key=value  : Attach tag with integer value for saver
  -j key=string : Attach tag with string value for saver
  -g WxH        : Specify output image size