先看DEMO
https://demos.algorithmia.com/colorize-photos/

瞭解ColorfulImageColorization
https://algorithmia.com/algorithms/deeplearning/ColorfulImageColorization

開發者中心
https://algorithmia.com/developers/clients/php/

申請賬號
https://algorithmia.com/signup

Algorithmia
E:\deeplearning\ColorfulImageColorization>composer require algorithmia/algorithmia

demo.php示例

<?php
require_once 'vendor/autoload.php';

$input = json_decode('{
    "image": "http://www.ccsph.com/uploadfiles/images/20140903/0903014741704335.jpg",
    "location": "data://coffeehan/test1219/55.png"
}');
$client = Algorithmia::client("simLka50Eld+o1aKJXX6ZprZOWO1");
$algo = $client->algo("deeplearning/ColorfulImageColorization/1.1.13");
 
print_r($algo->pipe($input)->result);

$mydir = $client->dir("data://coffeehan/test1219");
$myfile = $mydir->file("55.png");
$temp_file = $myfile->getFile();
@copy($temp_file, './55.png');
@unlink($temp_file);
?>

實際效果