Some programically generated images in imglib2.

GenImages.java

import java.util.function.BiConsumer;
import net.imglib2.FinalInterval;
import net.imglib2.Interval;
import net.imglib2.Localizable;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.img.Img;
import net.imglib2.loops.LoopBuilder;
import net.imglib2.position.FunctionRandomAccessible;
import net.imglib2.type.numeric.RealType;
import net.imglib2.type.numeric.real.DoubleType;
import net.imglib2.util.Util;
import net.imglib2.view.IntervalView;
import net.imglib2.view.Views;

public class GenImages
{

  public static <T extends RealType<T>> RandomAccessibleInterval<T> expChirpImage( 
			final T type, final Interval interval,
			double f0, double f1, final boolean copy )
	{
		// exp chirp
		final double w = interval.realMax( 0 );
		final double k = Math.pow( (f1 / f0), 1 / w );

		BiConsumer<Localizable,T> fun = new BiConsumer<Localizable,T>(){
			@Override
			public void accept( Localizable p, T t )
			{
				t.setReal( 	1 * Math.cos( p.getDoublePosition( 0 ) * f0 * Math.pow( k, p.getDoublePosition( 0 ) ) )); 
			}
		};

		FunctionRandomAccessible<T> freqSweep = new FunctionRandomAccessible<>( interval.numDimensions(), fun, type::createVariable );
		IntervalView<T> virtualimg = Views.interval( freqSweep, interval );
		if( copy )
		{
			Img<T> memimg = Util.getSuitableImgFactory( interval, type).create(interval);
			LoopBuilder.setImages( virtualimg, memimg ).forEachPixel( (x,y) -> y.set(x) );
			return memimg;
		}
		else
			return virtualimg;
	}

}