61 lines
1.5 KiB
Groff
61 lines
1.5 KiB
Groff
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.TH IM_EXTRACT 3 "11 April 1990"
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.SH NAME
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im_extract_areabands, im_extract_bands, im_extract_area \- extract a portion of an image
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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int im_extract_areabands( IMAGE *in, IMAGE *out,
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.br
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int left, int top, int width, int height, int band, int nbands )
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int im_extract_area( IMAGE *in, IMAGE *out,
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.br
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int left, int top, int width, int height )
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int im_extract_bands( IMAGE *in, IMAGE *out,
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.br
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int chsel, int nbands )
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.SH DESCRIPTION
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.B im_extract_areabands(3)
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extracts the rectangular portion of the image defined by
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.B left,
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.B top,
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.B width,
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and
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.B height of image
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.B in
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and writes the result to image
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.B out.
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The area must lie entirely within in the image. Selects the set of
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.B nbands
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bands
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starting at band number
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.B band
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(numbering bands from zero).
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Works for any size image, any number of bands, any type. Works for LABPACK
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coded images too! But disallows band extraction in this case.
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.B im_extract_area(3)
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is a convenience function which extracts an area from an
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image, leaving the bands the same.
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.B im_extract_bands(3)
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takes
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.B nbands
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out of an image, starting from band
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.B band.
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So, for example, nbands == 2, bands == 1 will form a two band image from an RGB
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image, where the two bands are the G and the B bands.
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.SH RETURN VALUE
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The function returns 0 on success and -1 on error.
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.SH SEE ALSO
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im_insert(3), im_lrjoin(3), im_lrmerge(3), im_stats(3),
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im_region_region(3).
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.SH COPYRIGHT
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J. Cupitt,
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.SH AUTHOR
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J. Cupitt \- 11/04/1990
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