How to make an opacity factor matrix from ones and zeros?

i have a matrix of ones and zeros making an irregular shape

how do i write a script to change the zeros directly bordering the ones a value less then one (lets say 0.9) then any zeros which are spaced 2 spaces away 0.8 and ..etc

0.9 and 0.8 are not specific or constant but i want to use evenly spaced numbers between 0 and 1 based on the size of the matrix and how many it can fit between a one and the furthest point away from 1. I cant think of a solution to a situation where a 0 pixel is directly bordering a 1 but also 2 points away from another 1 (maybe just priority at that point?, if theres a better idea for this situation i'm open to something similar)

the purpose of this is to use the matrix as a opacity factor matrix for blending 2 images

[Walter Roberson]

What is the difference between this and your earlier https://www.mathworks.com/matlabcentral/answers/485546-alpha-blending-2-matrix-images ?

[Mike Rovan]

this is a smaller task which may be used for the bigger task in my earlier question. I came accross vision.AlphaBlender which i though might work for my earlier question so i wanted to create an opacity factory matrix (this question) to test out if it acually works for the bigger task in my previous question

[Walter Roberson]

Sounds like a duplicate question to me.