Github user SukantPal commented on the issue:
https://github.com/apache/commons-imaging/pull/38
I have done more commits. Everyone, I am a newbie, don't know if I
should've made a new PR for more commits. But for now, until someone responds,
I will be updating about my commits here.
I have added real filtering support in PngWriter. It now uses the PAETH
filter for each scan-line in non-indexed (non-paletted based) PNG image files.
This has reduced the sizes of the images outputted in PngMultipleRoundTest by
40-50%. Hope that will be appreciated.
In addition, I have removed the complexity associated with filtering. Now
only one object - AdaptiveFilter - is used to filter scan-lines. It is fed each
scan-line serially using its filter/unfilter method. The ScanExpediter now
doesn't handle filtering directly.
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