lunapaint/png-codec

Consider adding support for non-standard png extensions

Tyriar opened this issue · 2 comments

From http://fileformats.archiveteam.org/wiki/PNG

Chunk type References and remarks
oFFspCALsCALgIFggIFxgIFt**, fRAc Refer to Extensions to the PNG 1.2 Specification, v1.2.0.
sTER Refer to Extensions to the PNG 1.2 Specification, v1.3.0.
dSIG Refer to Extensions to the PNG 1.2 Specification, v1.4.0, and the PNG dSIG website.
acTL, fcTL, fdAT Used in APNG files.
vpAg, caNv, orNT Used by ImageMagick.
CgBI Refer to CgBI.
eXIfexIf* Exif metadata. Refer to PNG Proposed eXIf chunk [approved 2017-07].
iDOT Used by Apple products. Some info at [1].

* Not doing to implement exIf as it's for test impls
** gIFt is deprecated

Main ones have their own issues now