Ticket #36477: 36477_1.diff

src/wp-includes/class-wp-image-editor-imagick.php

@@ -301 +301 @@
                         'FILTER_BESSEL',
                         'FILTER_SINC',
                 );
-
+                
                 /**
+                 * If number of unique colors is already 256 or less,
+                 * Use an filesize optimizing filter that will retain the same number of colors when resizing.
+                 * This will reduce occurrences of having a resized image filesize very much larger than the original.
+                 * @since 4.6.0
+                 */     
+                
+                if ( is_callable( array( $this->image, 'getImageColors' ) ) ) {
+                        $number_of_unique_colors = intval( $this->image->getImageColors() );
+                        if ( $number_of_unique_colors <= 256 ) {
+                                $filter_name = 'FILTER_POINT';
+                        }
+                }
+                
+                /**
                  * Set the filter value if '$filter_name' name is in our whitelist and the related
                  * Imagick constant is defined or fall back to our default filter.
                  */