1IM_RECOMB(3)               Library Functions Manual               IM_RECOMB(3)
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NAME

6       im_recomb - matrix recombination of image
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SYNOPSIS

9       #include <vips/vips.h>
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11       int im_recomb(imagein, imageout, mat)
12       IMAGE *imagein, *imageout;
13       DOUBLEMASK *mat;
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DESCRIPTION

17       im_recomb()  recombines  the  elements  of an m band image to form an n
18       band image using mat, an m by n matrix of floating point numbers.
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20       It calculates
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22         A = B x C
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24       where A is an n band output image, C is an m band input image and B  is
25       an m by n matrix of floats. Can be used with a 3 by 3 matrix to perform
26       simple colour space transforms; 7 by 30  matrix  to  shrink  3rd  order
27       development of 3 filter system to XYZ etc.
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29       The output type is float unless the input type is double, in which case
30       the output type is double. It does not work for  complex  image  types.
31       All intermediates are calculated as double.  Note that the width of the
32       matrix should be equal to the number of bands in the input image.
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RETURN VALUE

36       The function returns 0 on success and -1 on error.
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SEE ALSO

39       im_read_dmask(3), im_matinv(3), im_lintra(3)
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42       National Gallery and Birkbeck College, 1990 - 1996
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46                                 11 April 1990                    IM_RECOMB(3)
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