Scales a palletized Bitmap (where each palette entry has individual alpha) using bilinear filtering
to a Bitmap with N color palette, where:
index0 = transparent, index1 = light color, ... , indexN-2 = dark color, indexN-1 = black.
Scales a palletized Bitmap (where each palette entry has individual alpha) using a given scaling filter
to a Bitmap with N color palette, where:
index0 = transparent, index1 = light color, ... , indexN-2 = dark color, indexN-1 = black