The smallest 256x256 single-color PNG file, and where you've seen it
Do you recognise these images? There's a good chance you've seen some of them before now, probably several times. Here's a hint: They all depict the same thing. 103 bytes 156 bytes 178 bytes 379 bytes 921 bytes 1,189 bytes They all look pretty similar - so why the size difference? A quick intro to PNG The basic PNG file is comprised of recurring chunks. Each chunk is comprised of four parts: Lengt
Connecting the iDOTs - The Hacker Factor Blog
Last night's insomnia gave me some time to work through one of the big PNG forensics mysteries in life: What does Apple's iDOT chunk do? PNG Chunks Yes, they are really called "chunks" and Apple provides their own proprietary one called an iDOT. As far as I can tell, nobody has managed to reverse-engineer it. (I really wanted to work into this blog a pun about Apple blowing chunks, but I couldn't
PNG Parser Differential
This PNG image renders differently in Apple vs non-Apple decoders: If you're using Apple-flavoured software, you should see "HELLO APPLE", and on all other software, you should see "HELLO WORLD". I found this while writing my own multi-threaded PNG decoder. While pondering my design, I realised that I had an exploitable implementation bug. After learning that Apple has their own implementation of
PNG and MNG/JNG image formats: home site / [png-mng-announce] Farewell, Glenn Rander-Pehrson
From: Cosmin T. <ct...@gm...> - 2018-10-22 18:01:54 Dear PNG users, developers and contributors, I am deeply saddened to inform you that Glenn Randers-Pehrson, our long-time group lead, passed away last weekend, following a long and painful illness. Glenn is one of the original designers of the PNG format, and a co-founder of the PNG Development Group, back in the mid-90's. He took good care of th
punypng - PNG Image Optimization and Compression - Gracepoint After Five
* Flash required. Supported Types: JPG, GIF and PNG (Max 500KB each) What is punypng? punypng is a free optimization service that can dramatically reduce the file size of an image by converting it into a highly-compressed, lossless PNG image. That translates to outrageously efficient web page loading, and just makes the web more puny. Making the web more puny isn't cheap, so help support our cause
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GitHub - xyproto/png2svg: :twisted_rightwards_arrows: Convert small PNG images to SVG Tiny 1.2
GitHub - DavidBuchanan314/ambiguous-png-packer: Craft PNG files that appear completely different in Apple software [NOW PATCHED]![GitHub - DavidBuchanan314/ambiguous-png-packer: Craft PNG files that appear completely different in Apple software [NOW PATCHED]](https://cdn-ak-scissors.b.st-hatena.com/image/square/453aa06d3dbaeb92ed8d031b8b0399f42b028b74/height=288;version=1;width=512/https%3A%2F%2Fopengraph.githubassets.com%2F7fdc2c74f2d689f720134075b5a6626fe8a101a65c96d401142a723ff00e3eb8%2FDavidBuchanan314%2Fambiguous-png-packer)
Ambiguous Decodes · Issue #3 · DavidBuchanan314/parallel-png-proposal
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