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mewebstudio / java-captcha-generator

Java Captcha Generator
MIT License
14 stars 4 forks source link

Rectangle box in captcha images #4

Closed newmangreen closed 6 months ago

newmangreen commented 6 months ago

Hi,

Sometimes captcha generator produces rectangle for some characters. It is not specific with a character, it changes and other character is painted like rectangle.

I captured 2 capcthas with problematic images; UFA74 (First character) unrecognized character

wmqyE (Second and third character) unrecognized character 2

mewebstudio commented 6 months ago

Hi,

The reason for this problem is that some fonts on your system are not supported. Try using a different font for the solution. https://github.com/mewebstudio/java-captcha-generator?tab=readme-ov-file#how-to-use

newmangreen commented 6 months ago

Thank you but I fixed the problem at my local copy by checking render support of font. font.canDisplay(ch) If you want to include it to your repo, I attached my fix. I checked display capability of system fonts and 56 of total 617 can't display 'a' character. Using system fonts provide much more variability to the captcha image. Captcha.java.txt

mewebstudio commented 6 months ago

@newmangreen Thanks, I will consider it for the next version.