Simon Willison’s Weblog


Saturday, 8th February 2003


Mark invoked the lazy web earlier today in a bid to find a good way of bulk optimizing PNG files. Several people recommended pngcrush in the comments and it sounds like a fantastically useful piece of software—apparently it can run 114 different lossless compression methods on an image and automatically chose the most efficient one.

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Hashing client-side data

Via Scott, a clever PHP technique for ensuring data sent to the browser as a cookie or hidden form variable isn’t tampered with by the user:

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Image Drag bookmarklet

I got a good response to yesterday’s call for help on finding an HTML element’s co-ordinates on a page. I ended up using PPK’s findPos functions which seemed to do the trick just fine.

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2003 » February