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#16
April 17th, 2008, 04:57 PM
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Quote:
It's a tradeoff, but you have to maintain enough contrast for the human user while not enough for the OCR.
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#17
April 17th, 2008, 05:37 PM
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Sorry, LyonHeart. As much as I appreciate your helpful posts in the majority of instances, you are missing the boat on this one. Possibly you haven't actually worked with OCR.
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#18
April 18th, 2008, 10:41 AM
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This site may be useful for testing captcha images. The site uses Optical Character Recognition (OCR) to try and identify what font is used. If it cant distinguish your characters other OCR software may also struggle.
What about using symbols instead of letters / numbers?
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#19
April 18th, 2008, 10:49 AM
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The purpose of that site is entirely different. It isn't nearly a strong enough test.
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#20
April 18th, 2008, 03:35 PM
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Unless you have another alternative, Double Randoms work reasonably well.   The only problem, inevitably, is readability. Even normal captchas baffle some users. What would you suggest as an alternative test?
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#21
April 18th, 2008, 05:16 PM
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 Ultimately, making captchas harder for computers won't end captcha defeat. Some places have 'farms' of people that just sit at computers and interpret captcha images.
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#23
May 1st, 2008, 11:45 AM
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What's the alternative to Captchas then?
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#24
May 1st, 2008, 11:59 AM
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#25
May 2nd, 2008, 04:00 AM
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Some can use audio, like this one: http://recaptcha.net
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#26
May 2nd, 2008, 04:08 AM
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I'd prefer the first one using animation. I think that's the best solution because the frame is changing. The pick kitten thing is also good but the downside is it's also hard for humans. I already encountered that and took me 4 retries before i got it right, which is not good because that might lose potential clients.
The CSS solution is simple but the CAPTCHAS with animation is still better. Using other methods I can easily workaround with the CSS solution automating the forms and clicking the submit button.
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