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<p>The <a href="../www/api/MagickWand/index.html" target="744761541">MagickWand API</a> is the recommended interface between the C programming language and the ImageMagick image processing libraries. Unlike the <a href="../www/magick-core.html">MagickCore</a> C API, MagickWand uses only a few opaque types. Accessors are available to set or get important wand properties. A description of the MagickWand public methods are found here:</p>
<ul>
<li><a href="../www/api/magick-wand.html">Magick Wand Methods</a></li>
<li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
<li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
<li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
<li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
<li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
<li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
</ul>
<p>After you write your MagickWand program, compile it like this:</p>
<pre class="text">
cc `MagickWand-config --cflags --cppflags` wand.c `MagickWand-config --ldflags --libs`
</pre>
<p>Here is a example program that utilizes the MagickWand API to get you started, <a href="../www/source/wand.c">wand.c</a>. It reads an image, creates a thumbnail, and writes the result to disk.</p>
<div class="viewport">
<pre class="code">
#include <stdio.h>
#include <stdlib.h>
#include <wand/MagickWand.h>
int main(int argc,char **argv)
{
#define ThrowWandException(wand) \
{ \
char \
*description; \
\
ExceptionType \
severity; \
\
description=MagickGetException(wand,&severity); \
(void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
description=(char *) MagickRelinquishMemory(description); \
exit(-1); \
}
MagickBooleanType
status;
MagickWand
*magick_wand;
if (argc != 3)
{
(void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
exit(0);
}
/*
Read an image.
*/
MagickWandGenesis();
magick_wand=NewMagickWand();
status=MagickReadImage(magick_wand,argv[1]);
if (status == MagickFalse)
ThrowWandException(magick_wand);
/*
Turn the images into a thumbnail sequence.
*/
MagickResetIterator(magick_wand);
while (MagickNextImage(magick_wand) != MagickFalse)
MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
/*
Write the image then destroy it.
*/
status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
if (status == MagickFalse)
ThrowWandException(magick_wand);
magick_wand=DestroyMagickWand(magick_wand);
MagickWandTerminus();
return(0);
}
</pre>
</div>
<p>Here is another program that shows one way to get and set image pixels with the MagickWand API, <a href="../www/source/contrast.c">contrast.c</a>. It reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk.</p>
<div class="viewport">
<pre class="code">
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <wand/MagickWand.h>
int main(int argc,char **argv)
{
#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
#define SigmoidalContrast(x) \
(QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
#define ThrowWandException(wand) \
{ \
char \
*description; \
\
ExceptionType \
severity; \
\
description=MagickGetException(wand,&severity); \
(void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
description=(char *) MagickRelinquishMemory(description); \
exit(-1); \
}
long
y;
MagickBooleanType
status;
MagickPixelPacket
pixel;
MagickWand
*contrast_wand,
*image_wand;
PixelIterator
*contrast_iterator,
*iterator;
PixelWand
**contrast_pixels,
**pixels;
register long
x;
unsigned long
width;
if (argc != 3)
{
(void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
exit(0);
}
/*
Read an image.
*/
MagickWandGenesis();
image_wand=NewMagickWand();
status=MagickReadImage(image_wand,argv[1]);
if (status == MagickFalse)
ThrowWandException(image_wand);
contrast_wand=CloneMagickWand(image_wand);
/*
Sigmoidal non-linearity contrast control.
*/
iterator=NewPixelIterator(image_wand);
contrast_iterator=NewPixelIterator(contrast_wand);
if ((iterator == (PixelIterator *) NULL) ||
(contrast_iterator == (PixelIterator *) NULL))
ThrowWandException(image_wand);
for (y=0; y < (long) MagickGetImageHeight(image_wand); y++)
{
pixels=PixelGetNextIteratorRow(iterator,&width);
contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
if ((pixels == (PixelWand **) NULL) ||
(contrast_pixels == (PixelWand **) NULL))
break;
for (x=0; x < (long) width; x++)
{
PixelGetMagickColor(pixels[x],&pixel);
pixel.red=SigmoidalContrast(pixel.red);
pixel.green=SigmoidalContrast(pixel.green);
pixel.blue=SigmoidalContrast(pixel.blue);
pixel.index=SigmoidalContrast(pixel.index);
PixelSetMagickColor(contrast_pixels[x],&pixel);
}
(void) PixelSyncIterator(contrast_iterator);
}
if (y < (long) MagickGetImageHeight(image_wand))
ThrowWandException(image_wand);
contrast_iterator=DestroyPixelIterator(contrast_iterator);
iterator=DestroyPixelIterator(iterator);
image_wand=DestroyMagickWand(image_wand);
/*
Write the image then destroy it.
*/
status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
if (status == MagickFalse)
ThrowWandException(image_wand);
contrast_wand=DestroyMagickWand(contrast_wand);
MagickWandTerminus();
return(0);
}
</pre>
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