Compress .png files using Zopfli

[marcelgerber]

Again, compressing our .png files using zopflipng, which is lossless compression.
Saves us 251kB.

[ficristo]

If we compresse the same images again what will happen? Will the images come back identical, I mean without be more compressed?

[petetnt]

@ficristo nothing would happen, just equally compressed 💅

[ficristo]

In this case, merged.

[marcelgerber]

Well, I'm not quite sure, as Zopfli in the standard configuration only tries a set amount of time (read: very often) to optimize these images. So it could be that, based on an already compressed image, it can manage to shave off a few more bits. We can also set Zopfli to run a multitude of calculations more (which can take several hours sometimes) so we can get even better results, but I'm not sure this is worth the hassle.

[ficristo]

@marcelgerber thank you for the explanation.
No I don't want to compress at max the images, I only wanted to know what would happen.