protected byte getSegmentData(final int offset) {
        return segmentData[offset];
    }
Returns a specific byte of the segment's contents, excluding the marker and length bytes at the beginning.

@param offset segment offset
@see AbstractGenericSegment#getSegmentData()
@return the bye in the segment's contents
src/main/java/org/apache/commons/imaging/formats/jpeg/segments/AbstractGenericSegment.java