Great to hear, I totally misunderstood you then, no worries my friend - and thank you for the words about my work
So the way you've compressed the standalone PNGs brought em down to 931 bytes in total (I don't know if the visual quality got compromised by your screenshot)
But I did the exact same thing to the entire set of PNGs in the Pull Request - but let's keep it to the result for the three PNGs specific to the favicon.ico
As you see, they came out at 726 bytes I got this result from using ImageAlpha for lossy but still not visible compression of transparent PNGs in conjunction with ImageOptim for lossless compression of the PNGs (you can verify this through the sources in the .zip i posted over at the Pull Request.
So minor bytes aside - we're totally agreeing to the same thing here, with only a slight difference in tooling between windows and OS X.
But the important and interesting part is the .ico bundling
I'm betting that the size of your final ico.ico from your screenshot is ~15.000 bytes (even making the initial compression redundant), and that's what
convert gives me, no matter which
-compress type I'm using.
And not only that - it's visually compromised as its transparency seems to be created against black, you can tell that by looking it the edges of the graphic in the icon.
Here you see the Lossless compressed ~15.000 bytes icon from convert to the left --- And the compressed 1.629 bytes icon from Gimp to the right
Even the build-in Image Preview.app that ships with OS X (El Capitan) from Apple screws this part completely up, as it gives the exact same useless result == bigger filesize and worse visible quality.
But with Gimp
The Photoshop alternative which after all is a Free and Open Source, cross-platform image editor available for GNU/Linux, OS X, Windows - I don't even have to pre-compress the PNGs - I'm only have to tick off "[ X ] Compression" when exporting to .ico to get a proper compressed favicon.ico without noticeable visual compromise at just 1.629 bytes.
Yeah, the CDN for the forum don't get image compression right like us - that's why I (in all fairness) uploaded the three uncompressed sources for the favicon through my screenshot share thingy