Update

Code/README.txt

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+# Code für Plugins
+
+Den Ordner "plugins" kopieren nach "ImageJ.app"
+
+Die Java Klasse muss in einer Datei mit dem gleichen Namen liegen. Auch muss die Datei in einem Ordner mit dem gleichen Namen liegen.

Code/plugins/Gamma_2018_10_24/Gamma_2018_10_24.java

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+import ij.ImagePlus;
+
+import ij.plugin.filter.PlugInFilter;
+
+import ij.process.ImageProcessor;
+
+import java.util.*;
+
+/**
+ * This is a template for a plugin that requires one image to
+ * be opened, and takes it as parameter.
+ */
+public class Gamma_2018_10_24 implements PlugInFilter {
+	protected ImagePlus image;
+
+	/**
+	 * This method gets called by ImageJ / Fiji to determine
+	 * whether the current image is of an appropriate type.
+	 *
+	 * @param arg can be specified in plugins.config
+	 * @param image is the currently opened image
+	 * @see ij.plugin.filter.PlugInFilter#setup(java.lang.String, ij.ImagePlus)
+	 */
+	@Override
+	public int setup(String arg, ImagePlus image) {
+		this.image = image;
+		/*
+		 * The current return value accepts all gray-scale
+		 * images (if you access the pixels with ip.getf(x, y)
+		 * anyway, that works quite well.
+		 *
+		 * It could also be DOES_ALL; you can add "| NO_CHANGES"
+		 * to indicate that the current image will not be
+		 * changed by this plugin.
+		 *
+		 * Beware of DOES_STACKS: this will call the run()
+		 * method with all slices of the current image
+		 * (channels, z-slices and frames, all). Most likely
+		 * not what you want.
+		 */
+		return DOES_8G | DOES_16 | DOES_32;
+	}
+
+	/**
+	 * This method is run when the current image was accepted.
+	 *
+	 * @param ip is the current slice (typically, plugins use
+	 * the ImagePlus set above instead).
+	 * @see ij.plugin.filter.PlugInFilter#run(ij.process.ImageProcessor)
+	 */
+	@Override
+	public void run(ImageProcessor ip) {
+		int k = 256;
+		int aMax = k -1;
+		double gamma = 2.8;
+		// bauen uns eine LUT (Look-Up-Table)
+		int[] lut = new int[k];
+
+		for (int a = 0; a < k; ++a) {
+			double aa = ((double) a) / aMax;
+			double bb = Math.pow(aa, gamma);
+			int b = (int) Math.round(bb*aMax);
+			lut[a] = b;
+		}
+
+		ip.applyTable(lut);
+		
+	}
+}

Code/plugins/readme.txt

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+User plugins go here.