I'm getting a message from PageSpeed Insights that recommends to compress some png images. E.g: If compressing .../logo.png without loosing information, you would save 1.014 B (12% redcuction). ...
I'm going nuts here. I'll try to be straight to the point. I'm using Photoshop CC and have this dark background image for a poster with some text info. Sentences in white, three infos in purple, ...