imager

Example - flip:

Usage: $php demo-flip.php <image_path> <image_destination> <flip_mode>
args for flip mode. Use 1 for 'horizontal', 2 for 'vertical', 3 for 'both'
E.G. $php demo-flip.php "/path/to/image/file" "/path/to/image/file2" 1

Example - rotate:

Usage: php demo-rotate.php <image_path> <image_destination>
args for rotate: angle. Between 0 and 359
E.G. $php demo-rotate.php "/path/to/image/file" "/path/to/image/file2" 45

Example - filters:

Usage: php demo-filter.php <image_path> <image_destination> [args]
Args: depending on filter different args needs (some filters not accept any arg)
E.G. Following should convert image in grayscale: $php demo-filter.php "/path/to/image/file" "/path/to/image/file2" 1

Filters for apply without args:
IMG_FILTER_NEGATE = 0
IMG_FILTER_GRAYSCALE = 1
IMG_FILTER_GAUSSIAN_BLUR = 7
IMG_FILTER_SELECTIVE_BLUR = 8
IMG_FILTER_EMBOSS = 6
IMG_FILTER_MEAN_REMOVAL = 9

Filters for apply with args:
IMG_FILTER_BRIGHTNESS = 2 (1 arg)
IMG_FILTER_CONTRAST = 3 (1 arg)
IMG_FILTER_COLORIZE = 4 (3 args)
IMG_FILTER_EDGEDETECT = 5 (1 arg)
IMG_FILTER_SMOOTH = 10 (1 arg)
IMG_FILTER_PIXELATE = 11 (2 arg)
IMG_FILTER_SCATTER = 12 (2 arg)