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, 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
PROP_DATA(3) BSD Library Functions Manual PROP_DATA(3)NAME
prop_data, prop_data_create_data, prop_data_create_data_nocopy, prop_data_copy, prop_data_size, prop_data_data, prop_data_data_nocopy,
prop_data_equals, prop_data_equals_data -- opaque data value property object
LIBRARY
Property Container Object Library (libprop, -lprop)
SYNOPSIS
#include <prop/proplib.h>
prop_data_t
prop_data_create_data(const void *blob, size_t len);
prop_data_t
prop_data_create_data_nocopy(const void *blob, size_t len);
prop_data_t
prop_data_copy(prop_data_t data);
size_t
prop_data_size(prop_data_t data);
void *
prop_data_data(prop_data_t data);
const void *
prop_data_data_nocopy(prop_data_t data);
bool
prop_data_equals(prop_data_t dat1, prop_data_t dat2);
bool
prop_data_equals_data(prop_data_t data, const void *blob, size_t len);
DESCRIPTION
The prop_data family of functions operate on an opaque data value property object type.
prop_data_create_data(const void *blob, size_t len)
Create a data object that contains a copy of blob with size len. Returns NULL on failure.
prop_data_create_data_nocopy(const void *blob, size_t len)
Create a data object that contains a reference to blob with size len. Returns NULL on failure.
prop_data_copy(prop_data_t data)
Copy a data object. If the data object being copied is an external data reference, then the copy also references the same external
data. Returns NULL on failure.
prop_data_size(prop_data_t data)
Returns the size of the data object. If the supplied object isn't a data object, zero is returned.
prop_data_data(prop_data_t data)
Returns a copy of the data object's contents. The caller is responsible for freeing the returned buffer. If the supplied object
isn't a data object or if the data container is empty, NULL is returned.
In user space, the buffer is allocated using malloc(3). In the kernel, the buffer is allocated using malloc(9) using the malloc type
M_TEMP.
prop_data_data_nocopy(prop_data_t data)
Returns an immutable reference to the contents of the data object. If the supplied object isn't a data object, NULL is returned.
prop_data_equals(prop_data_t dat1, prop_data_t dat2)
Returns true if the two data objects are equivalent. If at least one of the supplied objects isn't a data object, false is returned.
prop_data_equals_data(prop_data_t data, const void *blob, size_t len)
Returns true if the data object's value is equivalent to blob with size len. If the supplied object isn't a data object, false is
returned.
SEE ALSO prop_array(3), prop_bool(3), prop_dictionary(3), prop_number(3), prop_object(3), prop_string(3), proplib(3)HISTORY
The proplib property container object library first appeared in NetBSD 4.0.
BSD April 22, 2006 BSD