Icy Version 1.6.1.1
Java(TM) SE Runtime Environment 1.8.0_31-b13 (64 bit)
Running on Windows 7 6.1 (amd64)
Max java memory : 6201.0 MB

Comment:
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Not enough memory !
Try to increase the Maximum Memory parameter in Preferences.
You can also report the error if you think it is not due to a memory problem.
java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferInt.(Unknown Source)
at java.awt.image.Raster.createPackedRaster(Unknown Source)
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(Unknown Source)
at java.awt.image.BufferedImage.(Unknown Source)
at icy.image.ARGBImageBuilder.getImage(ARGBImageBuilder.java:136)
at icy.image.ARGBImageBuilder.buildARGBImage(ARGBImageBuilder.java:172)
at icy.image.IcyBufferedImageUtil.getARGBImage(IcyBufferedImageUtil.java:167)
at icy.image.IcyBufferedImageUtil.getARGBImage(IcyBufferedImageUtil.java:210)
at icy.gui.component.sequence.SequencePreviewPanel$CustomPanel.run(SequencePreviewPanel.java:147)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)