Карась вещает | United States America (US)

Create: 2019-09-22 Update: 2024-05-22 00:55:08

Цифровой шум

При съёмке в темноте он неизбежен, высокие ISO пощады не дают. Я нашёл фокус, ещё когда много фотографировал, как влияние этого шума снизить.

Принцип появления цифрового шума, я думаю, понятен всем. Основное его свойство в том, что если изображение полностью чёрное, шум будет очень ярко выделяться на нём. Соответственно, если мы снимаем тёмную картинку и потом осветляем, шум, который был и так ярким, высветлится ещё больше.

Чтобы наебать матрицу камеры, снимок следует сделать светлее, чем предполагается в итоге. Примерно на 2/3 ступени. Чтобы не пересветить картинку, следует сделать контрольный кадр и проверить прямо в камере гистограмму. Если в правый край не упирается высокий пик графика, можно жить. Главное помнить, что при повышении ISO снижается динамический диапазон матрицы и некоторый клиппинг в точках чёрного и белого неизбежен.

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Цифровой шум

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