Hot pixel (telescopes)

A hot pixel or bright dot defect is a pixel that outputs many more electrons than others at the same input signal in a charge-coupled device (CCD) or CMOS sensor.

In the simulated image,[1] the hot pixels are the sources of the salt-and-pepper noise.

In the definition of the HST ACS, A pixel above 0.14 e¯/pixel/second is considered a "hot" pixel.

[2] A warm pixel is a pixel that has negative bias values.

In the definition of the Hubble Space Telescope, a pixel below the hot pixels range but above 0.06 e¯/pixel/second is considered a "warm" pixel.