This workflow snippet shows how a Java Snippet node can be used to in conjuction with a Binary Objects to PNGs node to convert a base64 string encoding an image to an actual PNG image cell in a KNIME table.
Workflow 
Decoding Base64 to PNG
Used extensions & nodes
Created with KNIME Analytics Platform version 4.5.1
Note: Not all extensions may be displayed.
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KNIME AG, Zurich, Switzerland
Version 4.5.1
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KNIME AG, Zurich, Switzerland
Version 4.5.0
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KNIME AG, Zurich, Switzerland
Version 4.5.0
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