Hi, i'm learning how to make pixel art as well as 16 and 32 px icons, and antialiasing is important at this sizes, i have been investigating but i haven been able to find a tutorial or a guide to messure or calculate how to make the antialiasing, i mean for example how many grays should i paint when doing a black circle on a white background, how many many different grays should i use, how do i know where to place them, For example like in the picture below, there is not a standard placement if you will.







If you know of a tutorial that would be great, sorry if i that didn't make much sense my english is not very good.

Thanks in advanced guys.