To avoid issues on older hardware pixie sets a maximum texture size of 4096. This means that filters might not be applied properly to images that are larger then 4096x4096 or have a very high DPI. This will usually manifest in part of the image being blank after applying a filter.
To solve this, you can increase maximum textureSize option according to your needs. For example, if you plan to load 8000x8000 image into pixie, you would increase it like so:
var pixie = new Pixie({
textureSize: 8000
});