w3c/png Issues

Last updated Apr 5, 2026, 7:00:03 AM UTC.

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Issue Title Within SLO On maintainers' plates for Time left Time past SLO
#15 Textual chunk which is not `safe to copy` ❌
#16 Image tiling chunk ❌
#24 Alternative palettes ❌
#25 Internal IDs for fragment references ❌
#39 Consider using Zstandard and/or LZ4 instead of Deflate ❌
#40 Consider making the Adler32 check optional during decompression ❌
#41 Suggestion: regular restart markers ❌
#45 Formalize Apple's CgBI chunk ❌
#54 Multithreading PNG decoding, "parallel" PNG's ❌
#55 Much faster standard PNG writing ❌
#60 PNG Restart Marker specification ❌
#255 Consider improvements to progressive loading ❌
#308 Link to tables and figures by name ❌
#319 Tone-mapping should be stable when mDCv and cLLi are static ❌
#320 Handling invalid, unknown ancillary chunks ❌
#344 Flag for use of artistic controls ❌
#347 Should the spec still talk about frame buffers? ❌
#357 10 bit per channel proposal ❌
#366 Liaison letter from ISO TC 42/WG 23 on Gain Maps ❌
#380 Proposal: gain maps for PNG ❌
#390 Add PNG dWLm (Diffuse white luminance metadata ) chunk to conform to ISO 22028-5 ❌
#405 Consistent terminology ❌
#426 New filter method, optimised for 10,12,16 bits/component image data? ❌
#467 Join chunk ordering rules ❌
#493 Adding generic image-type data chunk(s) ❌
#494 Add iEXt chunk ❌
#495 Add iEId chunk ❌
#505 Filter suggestion improvement ❌
#536 4th edition meta-issue ❌
#537 5th edition meta-issue ❌
#538 Browsers are not handling BT.2020 images correctly ❌
#552 Improve section 7.2 Scanlines ❌
#566 Extensions doc shows pcal.c again instead of gamma-lookup.c ❌
#567 mDCV example wrong value ✔