@Override
    public byte[] getIccProfileBytes(final ByteSource byteSource, final GifImagingParameters params) throws ImagingException, IOException {
        return null;
    }
See {@link GifImageParser#readBlocks} for reference how the blocks are created. They should match the code we are giving here, returning the correct
class type. Internal only.
src/main/java/org/apache/commons/imaging/formats/gif/GifImageParser.java