Initial commit

composer.json

@@ -0,0 +1,13 @@
+{
+    "name": "creuna-fi/color-space-fixer",
+    "description": "Convert Adobe RGB / CMYK images to sRGB on upload. Requires ImageMagick built with lcms2 delegate.",
+    "type": "wordpress-plugin",
+    "license": "GPLv2-and-later",
+    "authors": [
+        {
+            "name": "Johannes Siipola",
+            "email": "johannes.siipola@creuna.fi"
+        }
+    ],
+    "require": {}
+}

functions.php

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+<?php
+
+/*
+Plugin name: Color Space Fixer
+Description: Convert Adobe RGB / CMYK images to sRGB on upload. Requires ImageMagick built with lcms2 delegate.
+Author: Johannes Siipola
+Author URI: https://www.creuna.com/fi/
+Version: 1.0.0
+Requires at least: 5.0
+Requires PHP: 7.0
+License: GPL v2 or later
+*/
+
+function csf_wp_handle_upload($array, $var)
+{
+
+    if (!extension_loaded('imagick')) {
+        error_log('Whoops, imagick is not loaded');
+        return $array;
+    }
+
+    // Color space conversion code based on cimage
+    // https://github.com/mosbth/cimage/blob/cd142c58806c8edb6164a12a20e120eb7f436dfb/CImage.php#L2552
+    // The MIT License (MIT)
+    // Copyright (c) 2012 - 2016 Mikael Roos, https://mikaelroos.se, mos@dbwebb.se
+
+    try {
+        $path = $array['file'];
+        $image = new Imagick($path);
+        $colorspace = $image->getImageColorspace();
+        //$this->log(" Current colorspace: " . $colorspace);
+        $profiles = $image->getImageProfiles('*', false);
+        $has_ICC_profile = (array_search('icc', $profiles) !== false);
+        //$this->log(" Has ICC color profile: " . ($has_ICC_profile ? "YES" : "NO"));
+        if ($colorspace === Imagick::COLORSPACE_SRGB || !$has_ICC_profile) {
+            error_log('No profile or image is already sRGB');
+        } else {
+            //$this->log(" Converting to sRGB.");
+            $sRGB_icc = file_get_contents(__DIR__ . '/icc/sRGB_v4_ICC_preference.icc');
+            $image->profileImage('icc', $sRGB_icc);
+            $image->transformImageColorspace(Imagick::COLORSPACE_SRGB);
+            $image->writeImage($path);
+        }
+    } catch (Exception $e) {
+        error_log('Whoops, failed to convert image color space');
+    }
+
+    return $array;
+};
+
+// add the filter
+add_filter('wp_handle_upload', 'csf_wp_handle_upload', 10, 2);