The class PngEncoder is missing a call to end() after its use of the java.util.zip.Deflater package.
This leads to a native memory leak - details here:
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Thanks for the report. I've committed this to the JCommon CVS for inclusion in the next release (1.0.14).
Has this bug been fixed also in PngEncoderB? In JCommon this class is not present anymore. Thanks!