If a greater charge is generated on the sensor due to the incident light than the individual pixel (defined by its full well capacity) can absorb, the result is normally blooming. Excessive charges move to neighbouring pixel zones and also generate signals there. The consequence is an overframing of the dark test object (dark edges are "compressed", bright image areas expand). State-of-the-art sensors have an anti-blooming gate to discharge excessive charges. This effect preferably appears in CCD sensors and is only visible in case of extremely strong overexposure.