[tommyquant]

The attributes in the tiling pattern are for isolating the middle pixel in every cell. Consider a 5x5 cell. The middle pixel would be x=2, y=2. The width and height being 1 is so that we only isolate a single pixel.

The reason for isolating the middle pixel is because it is the only pixel in the cell that contains the average color of the cell (after box blurring). Once isolated, we can use feMorphology to dilate this pixel so that it fills the cell.

Here is a React version to more clearly demonstrate the relationship between cell size and all of the attributes: https://codepen.io/tommyquant/pen/yLwyoGO

[pseudosavant]

That is great! Trying it out in my test harness didn't work, but apparently there was an extra <def> surrounding all of my filter definitions that caused a problem, but only with this one filter. Thanks for the explanation!