11 May 2017, 15:58

@screech Thanks.
It's better pngquant, especially in terms of speed and color reduction, but a combination of two would be perfect for what I'm looking for.
Pngquant does not eliminate / compresses metada what can be between 1% -5% of final weight reduction that added to the reduction of size obtained with pngquant already leaves an interesting file. The possibility of performing a second compression with optipng at the scraping time from uxs and not having to do it manually later, at least for me, would be helpful, it would be less painful to have all systems scraped with 1920x1080 images and an acceptable file size . Your comment made me see the light, but I see that I have misunderstood it, a pity, I will continue doing it manually.