CgBI

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File Format
Name CgBI
Ontology
Extension(s) .png

Overview

CgBI is the informal name of a PNG-like image file format developed by Apple. It may also be called iOS optimized PNG.

It is not compatible with PNG. Standard PNG decoders that don't support it will fail gracefully, due to an unknown "critical chunk".

Identification

Files begin with the standard 8-byte PNG signature. A private "CgBI" chunk appears before the "IHDR" chunk.

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