Added an option to fix the tiled tiff media type (#4).

config/module.config.php

@@ -374,6 +374,7 @@
             'iiifserver_manifest_logo_default' => '',
             'iiifserver_manifest_force_url_from' => '',
             'iiifserver_manifest_force_url_to' => '',
+            'iiifserver_manifest_force_tile_jpeg' => false,
             'iiifserver_image_creator' => 'Auto',
             'iiifserver_image_max_size' => 10000000,
             'iiifserver_image_tile_dir' => 'tile',

src/Form/ConfigForm.php

@@ -152,6 +152,18 @@ public function init()
             ],
         ]);
 
+        $manifestFieldset->add([
+            'name' => 'iiifserver_manifest_force_tile_jpeg',
+            'type' => Element\Text::class,
+            'options' => [
+                'label' => 'Force jpeg for tiled tiff and jpeg2000', // @translate
+                'info' => 'In some cases, an issue can occur with tiled tiff and metadata of the media should be updated to "image/jpeg".', // @translate
+            ],
+            'attributes' => [
+                'id' => 'iiifserver-manifest-force-tiled-jpeg',
+            ],
+        ]);
+
         $this->add([
             'name' => 'iiifserver_image',
             'type' => Fieldset::class,

src/View/Helper/IiifManifest.php

@@ -568,9 +568,11 @@ protected function _iiifImage(MediaRepresentation $media, $index, $canvasUrl, $w
             );
             $imageUrl = $this->view->iiifForceBaseUrlIfRequired($imageUrl);
 
+            $forceTileJpeg = $this->view->setting('iiifserver_manifest_force_tile_jpeg');
+
             $imageResource['@id'] = $imageUrl;
             $imageResource['@type'] = 'dctypes:Image';
-            $imageResource['format'] = $media->mediaType();
+            $imageResource['format'] = $forceTileJpeg ? 'image/jpeg' : $media->mediaType();
             $imageResource['width'] = $width;
             $imageResource['height'] = $height;