andi It doesn't really matter if it's png or jpg I tested both. You would think that jpg should be of higher quality when set to 100, but it isn't. I can't visually see the difference, anyway...
Anyway in terms of better... it's very simple, Doku images look very hazy - when compared to images on Discord, Imagur or just any other website for the most part. I upload an image of any size, and I look at how its displayed on Doku, there's a big loss of sharpness and quality that's very obvious. You seem to be insisting on some quantifiable measure, and I can't really give you that unless you'd like me to ask my art team to give you the loss in some DPI count? Even if I did that, it seems like we are beating around the bush.