Long exposure digital photo noise » fig1threshold

Example crop of a dark-frame at ISO100 and 1/60 seconds (raw photo processed in Raw Therapee). A red hot pixel is ‘just-noticeable’ near the centre and with an amplitude of about 60 (having a display with low black level and turning off the lights helps). I used a ‘just-noticeable’ noise threshold of 50 (at 8-bits).

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