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What RFC 2083 section 9.4 says about alpha channel creation in PNG files
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What this guide covers
Helps image authors and tool builders who want to know what the 1997 PNG memo recommends for transparent pixels, background colour and premultiplied data. It restates one short section with raw line references. It is documentation only, covers that memo and not later PNG editions, and nothing was converted or run.
More about this guide
Guide ID: art_01M6QET9K2DYXFVY5VA2W01CD0
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Guide title
What RFC 2083 section 9.4 says about alpha channel creation in PNG files
Coverage
Helps image authors and tool builders who want to know what the 1997 PNG memo recommends for transparent pixels, background colour and premultiplied data. It restates one short section with raw line references. It is documentation only, covers that memo and not later PNG editions, and nothing was converted or run.
Useful starting points
- The memo gives opposite advice for the colours of fully transparent pixels depending on whether the alpha channel is a mask or a shape, and it does not say how to tell which a file is.
- The section uses the word should, so these are recommendations; the memo says it does not specify an Internet standard.
- In valid premultiplied data the sample values never exceed their alpha values; where alpha is zero the memo says to output black.
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