Bare minimal test of a direct call to ImageMagick library's ConvertImageCommand().

magick-convert-example.c

/* source: https://legacy.imagemagick.org/discourse-server/viewtopic.php?p=80803#p80803
 * requires the "opencl-headers" package
 * compile:
 *   cc ConvertExample.c -o convert $(pkg-config --libs --cflags MagickCore MagickWand) */

/*
   Bare minimal test of a direct call to ConvertImageCommand()
   Actually this is basically what the "convert" command does.

   Compile with...
     gcc -I`pwd` -lMagickWand -lMagickCore convert_equiv.c -o convert_equiv

*/
#include <stdio.h>
#include "ImageMagick-7/MagickCore/studio.h"
#include "ImageMagick-7/MagickCore/exception.h"
#include "ImageMagick-7/MagickCore/image.h"
#include "ImageMagick-7/MagickWand/MagickWand.h"
#include "ImageMagick-7/MagickWand/convert.h"

int main(int argc, char **argv)
{
	MagickCoreGenesis(argv[0],MagickFalse);

	char *args[] = { "convert", "-size", "100x100", "xc:red", "show:" };
	int args_count = 5;

	ImageInfo *image_info = AcquireImageInfo();
	ExceptionInfo *exception = AcquireExceptionInfo();

	MagickBooleanType status = ConvertImageCommand(image_info, args_count, args, NULL, exception);

	if (exception->severity != UndefinedException) {
		status=MagickTrue;
		CatchException(exception);
	}

	/* this should not be needed as error is reported as an exception */
	if (status == MagickFalse)
		fprintf(stderr, "Error in call\n");

	image_info=DestroyImageInfo(image_info);
	exception=DestroyExceptionInfo(exception);

	MagickCoreTerminus();
}