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кодирование графического изображения
1.
КОДИРОВАНИЕ ГРАФИЧЕСКОГО ИЗОБРАЖЕНИЯ
2.
• При кодировании
графики все изображение дискретизируется. •Дискретизация – разбиение аналогового изображения на части (пиксели)
3.
ПАРАМЕТРЫ ДИСКРЕТИЗАЦИИ • 1.
Разрешение изображения • 2. Глубина цвета
4.
5.
ОТ ПАРАМЕТРОВ ДИСКРЕТИЗАЦИИ ЗАВИСИТ
КАЧЕСТВО ИЗОБРАЖЕНИЯ. • Много пикселей – хорошее качество • Мало пикселей – плохое качество
6.
ГЛУБИНА ЦВЕТА ВЛИЯЕТ
НА КОЛИЧЕСТВО ЦВЕТОВ В ИЗОБРАЖЕНИИ Монохромное изображение – всего 2 цвета (черный и белый) Глубина цвета 1 бит
7.
8.
ДЛЯ ХРАНЕНИЯ ТАКОГО ИЗОБРАЖЕНИЯ
НА КАЖДЫЙ ПИКСЕЛЬ ВЫДЕЛЯЕТСЯ 1 БИТ ИНФОРМАЦИИ
9.
ЕСЛИ ДОБАВИТЬ СЕРЫЙ
ЦВЕТ, ТО ДЛЯ ХРАНЕНИЯ 1 ПИКСЕЛЯ ИЗОБРАЖЕНИЯ НЕОБХОДИМО 2 БИТА
10.
ОЧЕВИДНО, ЧТО ЧЕМ
БОЛЬШЕ ЦВЕТОВ ИМЕЕТ ИЗОБРАЖЕНИЕ, ТЕМ БОЛЬШЕ ИНФОРМАЦИИ СОДЕРЖИТ 1 ПИКСЕЛЬ, Т.Е. ТЕМ БОЛЬШЕ ДЛИНА КОДА
11.
ДЛЯ ПОЛНОЦВЕТНОГО КОДИРОВАНИЯ ИСПОЛЬЗУЮТ СИСТЕМУ
RGB
12.
ИСПОЛЬЗУЯ ГЛУБИНУ ЦВЕТА
3 БИТА, МОЖЕМ ПОЛУЧИТЬ 8 ЦВЕТОВ
13.
ГЛУБИНА ЦВЕТА 3
БИТА (В ИЗОБРАЖЕНИИ 8 ЦВЕТОВ)
14.
15.
• Итак, количество
цветов зависит от глубины цвета (длины кода) Длина кода (глубина цвета) Количество цветов 1 бит 2 цвета 2 бита 4 цвета 3 бита 8 цветов 4 бита 16 цветов 8 бит 256 цветов 16 бит 65536 цветов 24 бита 16.777.216 цветов 32 бита Более 4 млрд. цветов
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