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node-canvas中画图清晰度缺失

我现在有个需求 需要上传一张图片,然后使用node-canvas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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等待大神解答

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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