Portable Network Graphics (PNG) Specification (Second Edition)
PortableNetworkGraphics(PNG)Specification(SecondEdition)ThisdocumentdescribesPNG(PortableNetworkGraphics),anextensiblefileformatforthelossless,portable,well-compressedstorageofrasterimages.PNGprovidesapatent-freereplacementforGIFandcanalsoreplacemanycommonusesofTIFF.Indexed-color,grayscale
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