scale - GIMP - Image - How to keep image quality when reduce image size?

Question

I have a image size 300x300mm resolution 72pixel/in. I want resize it to 120x120mm but keep the quality (by increase resolution?).

First test, I increase its resolution to 180pixel/in then scale it to 120x120 >> image still degrade.

Second test, I increase its resolution to 180pixel/in then scale it to 150x150 >> image still degrade.

Can you help me out? Thanks,

score 1 · Accepted Answer

如果您要调整 JPEG 或 PNG 的大小，就不可能保持质量，因为算法的工作方式。只有在处理 raw 或 tiff 文件时，才能毫无问题地更改图像大小。使用下面的链接可以使它不那么模糊。

看这里： https ://www.gimp.org/tutorials/Smart_Sharpening/和https://docs.gimp.org/en/gimp-image-scale.html

更多关于 JPEG 算法：

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