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canvas画图清晰度缺失

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canvas画图清晰度缺失

我现在有个需求 需要上传一张图片,然后添加文字形成一张新的图片。一张1920*1080的图，原图大小是6m，但是生成一张新的图片之后大小就只有3m多,不清晰了。请问有知道的前辈们如何解决这个问题吗


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canvas的width和height要和图片的宽高相同

上面的说width和height是指属性里的 而不是css


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