Thank you so much for answer NoiseCrime, you have right. Problem is blending where brush is too much soft and edges are as you say too much blurred or faded. I work on Dota2 workshop item, and I have all maps in 4k and resample down with bilinear to 512 for Antialising. And when I have on map too much colors, sometimes can…
Having looked at your PSD, the problem is due to your hand painting where the colours are far more blurred/faded at the edges than typical anti-aliasing between colours when baked from a modelling package would be, no doubt due to the level of 'softness' applied with your drawing tools. Don't forget the colour influence is…