Ok thanks, and I should have mentioned that I did search the documentation too. The reference to compression you mention is for compressing embedded metadata, not the actual image. According to the png specs, there are 10 levels of image compression, 0-9, and I want to be able to explicitly set that rather than accepting whatever, apparently undocumented, default is set in the module.

In reply to Re^2: Setting png compression level in Imager by Anonymous Monk
in thread Setting png compression level in Imager by Anonymous Monk

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