Hello,
Trying to work with only free programs I'm using Krita as my main "2D" tool and when it comes to these tricks for metal map I've got hard time. I find a way to get the edges white but can't add darker area to make them dull as krita convert black to transparent in the transparency mask.
Did you already do that in Krita ? Have you tips for reproduce your workflow in Krita ?
thanks.
Unfortunately I have very little Krita experience and can't readily offer details about translating this course's PS workflow.
You might find more Krita advice if you post this question to the Community Forum. I'd bet you'd find some Krita users that could help.