2005-05-07 メモ。 雑記 http://tech.millto.net/~pngnews/kndh/PngSpec1.2/PNGcontents.html http://tech.millto.net/~pngnews/kndh/PngSpec1.2/PNG-Rationale.html http://tech.millto.net/~pngnews/kndh/PngSpec1.2/PNG-Structure.html http://tech.millto.net/~pngnews/kndh/PngSpec1.2/PNG-Chunks.html