Exactly - the whole point of lossy compression is to compress it in a way that has a minimal effect on the type of data you're trying to compress while maximizi

Exactly - the whole point of lossy compression is to compress it in a way that has a minimal effect on the type of data you're trying to compress while maximizing the compression. Using a compression method on a different data set is unsurprisingly ineffective. We're not "blind" to the changes in images, but the algorithm is designed that the changes are minimal when in image form.