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<p>Here is a example program that utilizes the MagickCore API to get you started, <a href="../www/source/core.c">core.c</a>. It reads a GIF image, creates a thumbnail, and writes it to disk in the PNG image format.</p>
<div class="viewport">
-<pre class="code">
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
MagickCoreTerminus();
return(0);
}
-</pre>
</div>
<p><a id="image-view"></a>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 <a href="../www/source/core/sigmoidal-contrast.c">sigmoidal-contrast.c</a> 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).</p>
<div class="viewport">
-<pre class="code">
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
pixels=GetImageViewAuthenticPixels(contrast_view);
for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
{
- pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
- pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
- pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
- pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
+ SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
+ SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
+ SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
+ SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
+ pixels++;
}
indexes=GetImageViewAuthenticIndexes(contrast_view);
if (indexes != (IndexPacket *) NULL)
for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
- indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
+ SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
return(MagickTrue);
}
MagickCoreTerminus();
return(0);
}
-</pre>
</div>
</div>
\r
projects / imagemagick / blobdiff