How “lossy” could a compression method afford to be before it compromised the quality of a 4K picture?

在保证了4K画质的同时，多大的“压缩损失”才符合要求呢？

And this trick underlies most lossy compression techniques.

这个技巧是大多数有损压缩技术的基础。

This same idea is the basis of lossy compressed image formats, most famously JPEGs.

同样的想法是有损压缩图像格式的基础，最著名的是 JPEG。

Lossy audio compressors takes advantage of this, and encode different frequency bands at different precisions.

有损音频压缩器利用了这一点，并以不同的精度对不同的频段进行编码。