Ok, Hopefully I can convey this problem clearly.
I have an 11 x 14 grid or matrix of perfect 10px x 10px shape layers (rectangles) making up a comp with the dimensions of 110px x 140px. These squares are fit perfectly inside this comp (no space between them, see image below)
Next, I have taken this comp and applied an Alpha Matte to it in conjunction with another shape layer containing the outlines of a letter. See below for example.
All of the sudden, my perfectly spaced squares now have about 1px of space between them and I can see through to the background. What is causing this? I cannot for the life of me figure out where the space is coming from or what is causing it. Is there some setting somewhere that I'm overlooking that is causing this?
Ok, I was able to fix this, but I'm not entirely sure what is going on. Here's what I did:
I went in to each of the 110 x 140 grid/matrix comps and switched each 10px x 10px square shape layer to "draft quality" (see image below). This cleared up the space between each square when viewed in my final comp with the Alpha Matte applied (see image below).
I have no idea what exactly is happening here. Is it the edge sampling? Since they were shape layers created in AE, I'm assuming they are vector and shouldn't have any problem with the edge info. Also, you'd assume "draft quality" would produce a less-than-desirable outcome, but on the contrary, it created a sharper final look. I'm a bit confused by this. Could someone please try to explain to me what exactly is happening? Or maybe point me to some documentation? Thanks!