1LIGHT_CORRECT(1)            General Commands Manual           LIGHT_CORRECT(1)
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NAME

6       light_correct - correct illumination errors on set of images
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SYNOPSIS

9       light_correct grey image1 image2 image3 ...
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DESCRIPTION

12       The  first  argument should be an image of a piece of grey card, subse‐
13       quent arguments should be images taken with the  same  lighting  set-up
14       which  need  correcting. The corrected images are written to files pre‐
15       fixed with "ic_".
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17       For example, suppose you have a directory with the following files in:
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19         example% ls
20         dat1.1.v dat1.2.v dat2.1.v dat2.2.v dat3.1.v dat3.2.v
21         dat4.1.v dat4.2.v grey.v
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23       then run light_correct like this:
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25         example% light_correct grey.v dat*.v
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27       to generate this:
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29         example% ls
30         dat1.1.v dat1.2.v dat2.1.v dat2.2.v dat3.1.v dat3.2.v
31         dat4.1.v dat4.2.v grey.v
32         ic_dat1.1.v ic_dat1.2.v ic_dat2.1.v ic_dat2.2.v ic_dat3.1.v
33         ic_dat3.2.v ic_dat4.1.v ic_dat4.2.v
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35       light_correct works by smoothing out the grey card image, finding grey-
36       mean/pixel  for  each point, and then multiplying the result by all the
37       following images. It also removes any  .desc  files  it  generates,  to
38       avoid problems with im_global_balance(3).
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RETURN VALUE

42       returns 0 on success and non-zero on error.
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SEE ALSO

45       header(1), vips(1)
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48       The National Gallery and Birkbeck College, 1989-1996.
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52                                  14 Oct 1996                 LIGHT_CORRECT(1)
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