usage: /usr/bin/jpegtran [switches] [inputfile]
Switches (names may be abbreviated):
  -copy none     Copy no extra markers from source file
  -copy comments Copy only comment markers (default)
  -copy icc      Copy only ICC profile markers
  -copy all      Copy all extra markers
  -optimize      Optimize Huffman table (smaller file, but slow compression)
  -progressive   Create progressive JPEG file
Switches for modifying the image:
  -crop WxH+X+Y  Crop to a rectangular region
  -drop +X+Y filename          Drop (insert) another image
  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)
  -grayscale     Reduce to grayscale (omit color data)
  -perfect       Fail if there is non-transformable edge blocks
  -roll +X+Y     Roll image (shift with wraparound)
  -rotate [90|180|270]         Rotate image (degrees clockwise)
  -transpose     Transpose image
  -transverse    Transverse transpose image
  -trim          Drop non-transformable edge blocks
                 with -drop: Requantize drop file to match source file
  -wipe WxH+X+Y  Wipe (gray out) a rectangular region
Switches for advanced users:
  -arithmetic    Use arithmetic coding
  -icc FILE      Embed ICC profile contained in FILE
  -restart N     Set restart interval in rows, or in blocks with B
  -maxmemory N   Maximum memory to use (in kbytes)
  -maxscans N    Maximum number of scans to allow in input file
  -outfile name  Specify name for output file
  -nooverwrite   Don't overwrite output file if it exists
  -report        Report transformation progress
  -strict        Treat all warnings as fatal
  -verbose  or  -debug   Emit debug output
  -version       Print version information and exit
Switches for wizards:
  -scans FILE    Create multi-scan JPEG per script FILE