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light_correct(1) [debian man page]

LIGHT_CORRECT(1)					      General Commands Manual						  LIGHT_CORRECT(1)

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, subsequent arguments should be images taken with the same lighting set-up which need correcting. The corrected images are written to files prefixed 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
header(1), vips(1) COPYRIGHT
The National Gallery and Birkbeck College, 1989-1996. 14 Oct 1996 LIGHT_CORRECT(1)

Check Out this Related Man Page

vinvert(1Vi)															      vinvert(1Vi)

vinvert - invert image pixel values SYNOPSIS
vinvert [option ...] [infile] [outfile] DESCRIPTION
vinvert inverts each input image to produce a corresponding output image. The operation is suitable for swapping black and white in a grey- scale image. Each output pixel is computed from the corresponding input pixel by out-pixel = M - in-pixel where M is the maximum value allowed by the pixel representation, or 1 in the case of float or double pixels. Input pixel values must lie in the range [0,M]. Each output image has the same number of bands, rows and columns, and the same pixel representation, as the corresponding input image. COMMAND LINE OPTIONS
vinvert accepts the following options: -help Prints a message describing options. -in infile Specifies a Vista data file containing the input images. -out outfile Specifies where to write the output images as a Vista data file. Input and output files can be specified on the command line or allowed to default to the standard input and output streams. SEE ALSO
vnegate(1Vi), vop(1Vi), VImage(3Vi), Vista(7Vi) AUTHOR
Art Pope <> Vista Version 1.12 24 April 1993 vinvert(1Vi)
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