Batch GIMP script for auto-sharpen, white-balance and colour enhance

fix

  (define (batch-auto-fix pattern  
                radius  
                amount  
                threshold)  
  (let* ((filelist (cadr (file-glob pattern 1))))  
   (while (not (null? filelist))  
      (let* ((filename (car filelist))  
          (image (car (gimp-file-load RUN-NONINTERACTIVE  
                        filename filename)))  
          (drawable (car (gimp-image-get-active-layer image))))  
       (plug-in-unsharp-mask RUN-NONINTERACTIVE  
                  image drawable radius amount threshold)  
       (gimp-levels-stretch drawable)  
       (plug-in-color-enhance RUN-NONINTERACTIVE  
                  image drawable)  
       (gimp-file-save RUN-NONINTERACTIVE  
               image drawable filename filename)  
       (gimp-image-delete image))  
      (set! filelist (cdr filelist)))))  

Did you copy the script batch-auto-fix to the scripts folder in your installation of GIMP? Then you can run it by first navigating to the folder containing the script in command prompt, adding the gimp executable to your system PATH variable and then specifying the full directory path to your images in your command.

Run with
gimp -i -b '(batch-auto-fix "*.jpg" 5.0 0.5 0)' -b '(gimp-quit 0)'

and under Windows you have to change it to
gimp -i -b "(batch-auto-fix """*.jpg""" 5.0 0.5 0)" -b "(gimp-quit 0)"