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Материал из Newman's WiKi.

Imagemagick это OpenSource утилита для преобразования изображений в различных форматах. Это утилита коммандной строки, что позволяет использовать ее где угодно. А также дает возможность пакетной обработки файлов с изображениями.

Содержание 1 Стандартные операции 1.1 Конвертация форматов 1.2 Уменьшение размера 1.3 Создание превью

Стандартные операции

Конвертация форматов

Для конвертации форматов, в общем случае, ничего специально делать не надо. Достаточно просто указать требуемое расширение у файла.

convert original.gif new.png

В данном случае файл формата GIF переводится в PNG

Уменьшение размера

convert original.jpg -resize 600x600 new.jpg

Исходное изображение "вписывается" в квадрат 600 на 600 пикселей.

Создание превью

convert original.jpg -resize 200x200 -gravity center -extent 100x100 th_original.jpg

Изображение уменьшается до размера 200 на 200 пикселей, а потом из его центра "вырезается" картинка размером 100 на 100 пикселей и сохраняется как файл превью. В любом случае получившийся файл будет иметь размер 100x100.