protected void resetPredictor() {
        Arrays.fill(last, 0);
    }
Defines a method for accessing the floating-point raster data in a TIFF image. These implementations of this method in DataReaderStrips and
DataReaderTiled assume that this instance is of a compatible data type (floating-point) and that all access checks have already been performed.

@param subImage if non-null, instructs the access method to retrieve only a sub-section of the image data.
@return a valid instance
@throws ImagingException in the event of an incompatible data form.
@throws IOException      in the event of I/O error.
src/main/java/org/apache/commons/imaging/formats/tiff/datareaders/AbstractImageDataReader.java