Thanks for the help & info everyone. With that and a few tests, it appears that there is not enough room for improvement in compression to put much more effort into this. Apparently you cannot change the png compression in Imager, which defaults to level 6, and compressing to level 9 (using GIMP) only gives a small reduction in file size with a noticeable increase in processing time while saving the file.

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

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