About the Alagad Captcha:
The Alagad Captcha is a ColdFusion Component (CFC) written in 100% native ColdFusion which generates images of obfuscated text. This is the sort of type of image you might see when signing up for free mail accounts or in other various forms across the web. The text is human readable but not machine readable.
The word “Captcha” is an acronym for “completely automated public Turing test to tell computers and humans apart”. More information on Captchas can be found at http://en.wikipedia.org/wiki/Captcha.
Interestingly enough, the Wikipedia article linked to above points out that computers can be tweaked to read captcha images. As a test of this, I found a few captcha images from various sources and ran them though some OCR software. Though none which I tried had all characters recognized, most had at least some characters which were recognized. I found that only VERY obscured text which was next to illegible and light text on dark backgrounds were never matched by my (cheap) OCR software. The Alagad Captcha, by the way, had none matched but the text is still very human readable.
This Component is based on portions of the Alagad Image Component. In general, this is a specialized version of the AIC which can be used to create and verify Captcha images.
About the Alagad EXIF Reader Web Service:
A while ago I posted a web service to doughughes.net which would extract EXIF data from images and return an XML package of the data. After leaving it out on doughughes.net as a beta for a while and not getting any negative feedback I decided to go ahead and publish this.
The Web Service itself is free and very simple to use. The source code can be purchased and run locally or modified for some other purpose if desired.