}
$cmd = implode(' ', array_map('escapeshellarg', [
'convert',
- '-delete', '1--1',
+ '-delete', '1--1', # static
'-trim',
- '-background', 'white', '-layers', 'flatten',
+ '-background', 'white', '-layers', 'flatten', # opaque
+ '-auto-orient', # apply exif rotation
'-interlace', 'plane', # progressive
+ '-strip', '-taint', # omit metadata
+ '-sampling-factor', '4:2:0', '-colorspace', 'sRGB', # half chroma
'-resize', "${width}x${height}",
- '-quality', '90%',
+ '-quality', '85%',
$source, "jpg:$target"
]));
$return = shell_exec("$cmd 2>&1");