ImgResizer

ImgResizer -source {source} -dest {dest} -mode {mode}
  -dest string
        Destination file or directory
  -format string
        Output format 
        Supported values: png|jpg|jpeg|bmp|tiff|gif 
        Omit to keep original format 
  -height int
        Destination height 
        Omit to keep original height (default -1)
  -help
        Show help message 
  -mode int
        0 - (Default) Nearest-neighbor interpolation
        1 - Bilinear interpolation
        2 - Bicubic interpolation
        3 - Mitchell-Netravali interpolation
        4 - Lanczos resampling with a=2
        5 - Lanczos resampling with a=3
  -source string
        Source file or directory
  -width int
        Destination width
        Omit to keep original width (default -1)

ImgResizer -source ~/pics -dest ~/new_pics -mode 5 -height 128 -width 300

ImgResizer -source ~/pics/hello.gif -dest ~/newpics/wow.gif -width 900

ImgResizer -source ~/pics -dest ~/new_pics -format jpg