base duotone pack refixed 2 icon png download

Seems that the second colormatrix in luminance to alpha didn't produce a fully opaque fill, therefore the checkerboard was showing through a bit. Meaning a slight transparency was present. Now, that second colormatrix is sorted out, and instead a different compositing is used, resulting in a good coverage on the area. Edges on the other hand now producing "anti-aliasing artifacts" -in other words the compositing results in subpixels showing through where they shouldn't. In practice that can be solved by applying the filter on an "extended object" and clipping it to the desired size.