Hi, first I would avoid using 2D arrays for storing pixels and such, that's 
not even a Go thing, (although Go internal library uses a 1D array for 
storing pixels of images), even in C or C++ a 1D array is recomended, it is 
faster to say the least and more efficient.

img[x][y] becomes img[y*width+x]

And you iterate exactly the same. As for Go, 2D Arrays have to be 
initialized properly (each array inside the main one) and 1D arrays don't 
have that problem.
Also *png.Encode* takes a *Writer *and an *image*, so you can actually do 
that at once (without the buffer) as *w* (*http.ResponseWriter*) is a *Writer 
*already.

png.Encode(w, image)

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