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MagickWand C API

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The MagickWand API is the recommended interface between the C programming language and the ImageMagick image processing libraries. Unlike the MagickCore 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:

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The MagickWand API is the recommended interface between the C programming language and the ImageMagick image processing libraries. Unlike the MagickCore 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:

After you write your MagickWand program, compile it like this:

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$magick> cc `MagickWand-config --cflags --cppflags` -O2 -o wand wand.c \
`MagickWand-config --ldflags --libs`

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Here is a example program that utilizes the MagickWand API to get you started, wand.c. It reads an image, creates a thumbnail, and writes the result to disk.

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$magick> cc -o wand `pkg-config --cflags --libs MagickWand` wand.c

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Set the PKG_CONFIG_PATH environment variable if ImageMagick is not in your default system path:

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$magick> export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

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Here is a example program that utilizes the MagickWand API to get you started, wand.c. It reads an image, creates a thumbnail, and writes the result to disk.

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-#include <stdio.h>
-#include <stdlib.h>
-#include <wand/MagickWand.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <wand/MagickWand.h>
 
 int main(int argc,char **argv)
 {
@@ -231,7 +212,7 @@ int main(int argc,char **argv)
     severity; \
  \
   description=MagickGetException(wand,&severity); \
-  (void) fprintf(stderr,"%s %s %u %s\n",GetMagickModule(),description); \
+  (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
   description=(char *) MagickRelinquishMemory(description); \
   exit(-1); \
 }
@@ -271,17 +252,15 @@ int main(int argc,char **argv)
   MagickWandTerminus();
   return(0);
 }
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Here is another program that shows one way to get and set image pixels with the MagickWand API, contrast.c. It reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk.

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Here is another program that shows one way to get and set image pixels with the MagickWand API, contrast.c. It reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk.

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-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <wand/MagickWand.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <wand/MagickWand.h>
 
 int main(int argc,char **argv)
 {
@@ -384,16 +363,14 @@ int main(int argc,char **argv)
   MagickWandTerminus();
   return(0);
 }
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Now lets perform the same contrast enhancement while taking advantage of our dual or quad-core processing system by running the algorithm in parallel utilizing wand views. The sigmoidal-contrast.c module reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk just like the previous contrast enhancement program, but now it does its work in parallel (assumes ImageMagick is built with OpenMP support).

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Now lets perform the same contrast enhancement while taking advantage of our dual or quad-core processing system by running the algorithm in parallel utilizing wand views. The sigmoidal-contrast.c module reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk just like the previous contrast enhancement program, but now it does its work in parallel (assumes ImageMagick is built with OpenMP support).

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-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <wand/MagickWand.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <wand/MagickWand.h>
 
 static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
   const ssize_t y,const int id,void *context)
@@ -496,35 +473,27 @@ int main(int argc,char **argv)
   MagickWandTerminus();
   return(0);
 }
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MagickWand Examples in C illustrates how to use the ImageMagick MagickWand API. Each example is presented as a C function, complete with headers, so that it can be copied to a file and then included in your own C project.

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