91 lines
2.8 KiB
Groff
91 lines
2.8 KiB
Groff
|
.TH CONVERSIONS 3 "15 April 1991"
|
||
|
|
.SH NAME
|
||
|
|
im_c2amph, im_c2imag, im_c2ps, im_c2real, im_clip2fmt,
|
||
|
|
im_ri2c \- conversion between image types
|
||
|
|
.SH SYNOPSIS
|
||
|
|
#include <vips/vips.h>
|
||
|
|
|
||
|
|
int im_c2amph(in, out)
|
||
|
|
.br
|
||
|
|
IMAGE *in, *out;
|
||
|
|
|
||
|
|
int im_c2rect(in, out)
|
||
|
|
.br
|
||
|
|
IMAGE *in, *out;
|
||
|
|
|
||
|
|
int im_c2imag(in, out)
|
||
|
|
.br
|
||
|
|
IMAGE *in, *out;
|
||
|
|
|
||
|
|
int im_c2ps(in, out)
|
||
|
|
.br
|
||
|
|
IMAGE *in, *out;
|
||
|
|
|
||
|
|
int im_c2real(in, out)
|
||
|
|
.br
|
||
|
|
IMAGE *in, *out;
|
||
|
|
|
||
|
|
int im_clip2fmt(in, out, ofmt)
|
||
|
|
.br
|
||
|
|
IMAGE *in, *out;
|
||
|
|
.br
|
||
|
|
int ofmt;
|
||
|
|
|
||
|
|
int im_ri2c(in1, in2, out)
|
||
|
|
.br
|
||
|
|
IMAGE *in1, *in2, *out;
|
||
|
|
.SH DESCRIPTION
|
||
|
|
Each of the above functions converts the image held by the image descriptor in
|
||
|
|
to another type image and writes the result on the image descriptor out.
|
||
|
|
Sizes and the number of channels are identical to those of input. Whenever
|
||
|
|
required by the conversion, the element values are rounded by calling floor().
|
||
|
|
|
||
|
|
.B im_c2amph()
|
||
|
|
converts a complex (float or double) input to (amplitude, phase), with phase
|
||
|
|
in degrees. Output has the same format as input.
|
||
|
|
|
||
|
|
.B im_c2rect()
|
||
|
|
converts a complex (float or double) input in (amplitude, phase) form back to
|
||
|
|
rectangular coordinates. Again, phase should be expressed in degrees.
|
||
|
|
|
||
|
|
.B im_c2ps()
|
||
|
|
convert a (float or double) complex image to amplitude (float or
|
||
|
|
double) image. Complex input (a,b) is mapped to sqrt( a*a+b*b ).
|
||
|
|
|
||
|
|
.B im_clip2fmt()
|
||
|
|
converts the input image to 'ofmt', where ofmt is the new value for
|
||
|
|
BandFmt. For example, im_clip2fmt(in, out, FMTUSHORT) converts any image to
|
||
|
|
unsigned short.
|
||
|
|
|
||
|
|
The number of
|
||
|
|
clipped values (if any), are printed in the standard error output. Before
|
||
|
|
clipping rounding is carried out if necessary. When converting between real
|
||
|
|
and complex types with these functions, the imaginary part of the output is
|
||
|
|
set to zero. When converting from complex to real types, the imaginary part is
|
||
|
|
ignored. Use im_c2ps(), im_c2real() etc. to get other behaviour.
|
||
|
|
|
||
|
|
Legacy functions are available, called im_clip(), im_clip2c(), im_clip2d(),
|
||
|
|
im_clip2f(), im_clip2i(), im_clip2s(), im_clip2ui(), im_clip2us(),
|
||
|
|
im_clip2cm() and im_clip2dcm() which convert the input image to unsigned char,
|
||
|
|
signed char, double, float, int, short, unsigned int, unsigned short,
|
||
|
|
complex and double complex respectively.
|
||
|
|
|
||
|
|
.B im_ri2c()
|
||
|
|
takes as inputs two non-complex images of equal sizes and number of
|
||
|
|
channels. The output is a complex image with the real part coming from in1
|
||
|
|
and the imaginary part coming from in2. Output is float complex (FMTCOMPLEX)
|
||
|
|
only if none of the inputs is double. If one or both inputs are double the
|
||
|
|
result is double complex (FMTDPCOMPLEX).
|
||
|
|
|
||
|
|
.B im_c2real()
|
||
|
|
and
|
||
|
|
.B im_c2imag()
|
||
|
|
extract the real or the imaginary part of a
|
||
|
|
complex image respectively. If input is be float complex or double complex,
|
||
|
|
then output is float or double respectively.
|
||
|
|
|
||
|
|
.SH RETURN VALUE
|
||
|
|
The functions returns 0 on success and -1 on error.
|
||
|
|
.SH SEE ALSO
|
||
|
|
im_scale(3).
|