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Bookmark or Share- PNG Specification: Chunk Specifications - libpng.orgThis chapter defines the standard types of PNG chunks. 4.1. Critical chunks. All implementations must understand and successfully render the standard critical chunks. A valid PNG image must contain an IHDR chunk, one or more IDAT chunks, and an IEND chunk. 4.1.1.
- PNG - WikipediaAdditionally the PNG signature and individual chunks are marked with colors. Note they are easy to identify because of their human readable type names (in this example PNG, IHDR, IDAT, and IEND). Advantages. Reasons to use this International Standard: Portability: Transmission is independent of the software and hardware platform.
- Portable Network Graphics (PNG) Specification (Third Edition)IEND: image trailer, which is the last chunk in a PNG datastream. The remaining chunk types are termed ancillary chunk types, which encoders may generate and decoders may interpret. Transparency information: tRNS (see 11.3.1 Transparency information).
- PNG Tags - ExifToolPNG Tags. Tags extracted from PNG images. See http://www.libpng.org/pub/png/spec/1.2/ for the official PNG 1.2 specification. According to the specification, a PNG file should end at the IEND chunk, however ExifTool will preserve any data found after this when writing unless it is specifically deleted with -Trailer:All=.
- PNG Basics (PNG: The Definitive Guide) - libpng.orgThe simplest possible PNG file, diagrammed in Figure 8-2, is composed of the PNG signature and only three chunk types: the image header chunk, IHDR; the image data chunk, IDAT; and the end-of-image chunk, IEND.
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