默认出的png都好大，能不能出jpg，或者压缩一下画质也行
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Not currently, you could transform it in the runtime yourself since there are tons of libraries converting image formats.
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Could you name some for me? I’m a complete beginner and don’t know which one I can use.
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There are really tons of them, you can just search for keywords in npmjs, the first coming to my brain is jpeg-js, which is really nice:
Note: although it recommends sharp and sharp is really good but unfortunately it is a nodejs add-on thus difficultly to be handled in Koishi.
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如果可以，实际上我已经做了一个接口。它会自动压缩图片。返回的图片也就几十k了。
如果你需要，我把这个后端接口的文件发一下，自己部署
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好呀，我试试看
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好棒好棒好棒
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