Add the first example.

1 files changed, 50 insertions, 0 deletions

diff --git a/examples/sigmoidalContrast.d b/examples/sigmoidalContrast.d
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+/**
+ * Copyright: Mike Wey 2011
+ * License:   zlib (See accompanying LICENSE file)
+ * Authors:   Mike Wey
+ * 
+ * This is an translation of the sigmoidal contrast example
+ * that can be found on the ImageMagick website:
+ * http://www.imagemagick.org/source/core/sigmoidal-contrast.c
+ * 
+ * Mainly to demonstrate the parallel execution of the foreach
+ * over the ImageView, normaly you whould use Image.sigmoidalContrast.
+ */
+
+module examples.sigmoidalContrast;
+
+import std.math;
+import std.stdio;
+
+import dmagick.ColorRGB;
+import dmagick.Image;
+
+void main(string[] args)
+{
+	if ( args.length != 3 )
+	{
+		writefln("Usage: %s image sigmoidal-image", args[0]);
+		return;
+	}
+
+	Image image = new Image(args[1]);
+
+	//The Body of this loop is executed in parallel.
+	foreach ( row; image.view )
+	{
+		foreach ( ColorRGB pixel; row )
+		{
+			pixel.red     = SigmoidalContrast(pixel.red);
+			pixel.green   = SigmoidalContrast(pixel.green);
+			pixel.blue    = SigmoidalContrast(pixel.blue);
+			pixel.opacity = SigmoidalContrast(pixel.opacity);
+		}
+	}
+
+	image.write(args[2]);
+}
+
+double SigmoidalContrast(double q)
+{
+	return ((1.0/(1+exp(10.0*(0.5-q)))-0.0066928509)*1.0092503);
+}