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
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
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
* 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
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
処理を実行中です
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く