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PNG Chunks

Tool to extract and understand the PNG format chunks. The PNG (Portable Network Graphics) image format consists of multiple pieces of data (header, image, meta information, or hidden content).

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PNG Chunks -

Tag(s) : Image processing, Data processing

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PNG Chunks

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PNG Chunk Extraction

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Tool to extract and understand the PNG format chunks. The PNG (Portable Network Graphics) image format consists of multiple pieces of data (header, image, meta information, or hidden content).

Answers to Questions

What is a PNG chunk?

PNG files are composed of several parts, the chunks. Generally there is a header, a content and an end. The PNG format also has its specification the ability to integrate a comment area chunk, compressed or not, which is usually unreadable without a dedicated software.

How to read a tEXt chunk?

The tEXt chunk is readable directly in the file (in a text editor or an hexadecimalhref editor), it starts with tEXt, followed by a title, and a comment area.

Example: TEXt => My Title This is a PNG comment

How to read a zTXt chunk?

The zTXt chunk is similar to tEXt except that its content is compressed with DEFLATE. It is therefore necessary to find in the file zTXt, followed by a title, and a binary area not readable directly (because compressed), that zone must be decompressed before being able to read the message.

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Source code

dCode retains ownership of the source code of the script PNG Chunks. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the PNG Chunks script for offline use, for you, your company or association, see you on contact page !

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