How change backgroud of image ?

huacnlee / rucaptcha

Captcha Gem for Rails, which generates captcha image by Rust.

https://huacnlee.github.io/rucaptcha

MIT License

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Open longanhvn opened 4 years ago

longanhvn commented 4 years ago

exam : I want transparent backgroup , or need backgroup white or black . or more ? How set ?