>This is a strange test to do. The image he used is not really suited to PNG. It is more like a photograph, which is better in JPEG format, than an illustration, which is better as a PNG.
Isn't your comment why they used Lenna[1] so long -- it might be male gazey etc, but at least everyone is using the same male gazey softcore photo rather than sidetracking with arguments over image choice?
No. I was assuming that this blog post was about compressing PNG files for general use on web sites, but apparently that is not the case. He didn't actually state in the blog post what he was using the images for, but he says in a comment here that they need to be lossless. Usually that's not the case. JPEG works better for getting small sizes on photos for the web.
Isn't your comment why they used Lenna[1] so long -- it might be male gazey etc, but at least everyone is using the same male gazey softcore photo rather than sidetracking with arguments over image choice?
[1] https://en.wikipedia.org/wiki/Lenna