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LIGHT_CORRECT(1)	    General Commands Manual	      LIGHT_CORRECT(1)

NAME
       light_correct - correct illumination errors on set of images

SYNOPSIS
       light_correct grey image1 image2	image3 ...

DESCRIPTION
       The  first  argument should be an image of a piece of grey card,	subse-
       quent arguments should be images	taken with the	same  lighting	set-up
       which  need  correcting.	The corrected images are written to files pre-
       fixed with "ic_".

       For example, suppose you	have a directory with the following files in:

	 example% ls
	 dat1.1.v dat1.2.v dat2.1.v dat2.2.v dat3.1.v dat3.2.v
	 dat4.1.v dat4.2.v grey.v

       then run	light_correct like this:

	 example% light_correct	grey.v dat*.v

       to generate this:

	 example% ls
	 dat1.1.v dat1.2.v dat2.1.v dat2.2.v dat3.1.v dat3.2.v
	 dat4.1.v dat4.2.v grey.v
	 ic_dat1.1.v ic_dat1.2.v ic_dat2.1.v ic_dat2.2.v ic_dat3.1.v
	 ic_dat3.2.v ic_dat4.1.v ic_dat4.2.v

       light_correct works by smoothing	out the	grey card image, finding grey-
       mean/pixel  for	each point, and	then multiplying the result by all the
       following images. It also removes any  .desc  files  it	generates,  to
       avoid problems with im_global_balance(3).

RETURN VALUE
       returns 0 on success and	non-zero on error.

SEE ALSO
       vipsheader(1), vips(1)

COPYRIGHT
       The National Gallery and	Birkbeck College, 1989-1996.

				  14 Oct 1996		      LIGHT_CORRECT(1)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COPYRIGHT

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