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captcha's Issues

这个验证码设计明显缺陷:机器很好破解,人不好识别

这个验证码是一个失败的设计:机器很好破解,人不好识别
机器好破解的原因在于缺少连接线条易于切割、细小线完全可以通过滤波函数等直接无视,机器很好处理,人眼睛很累
这个楼主自己可以体验.
楼主可以参考其他语言的的设计.

image

Unreadable and mangled captcha with image widths > 270

Hello,

Text only renders properly in images up to 270 pixels in width. Above this size, the amount of mangling will increase with the resolution, until text becomes unreadable.

Here's side-by-side view of the problem using CreateCustom with the string 5678 and different resolutions starting at width 240 to 380:

image

At larger resolutions, things become really "interesting". Here's an example using a width of 640 pixels:

image

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