Index: wp-admin/includes/image-edit.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/includes/image-edit.php	(date 1433498320000)
+++ wp-admin/includes/image-edit.php	(revision )
@@ -822,7 +822,17 @@
 				$crop   = ( $nocrop ) ? false : get_option( "{$size}_crop" );
 			}
 
-			$_sizes[ $size ] = array( 'width' => $width, 'height' => $height, 'crop' => $crop );
+			/**
+			 * Filter the default image quality setting depending on the image size.
+			 *
+			 * @since 4.4.0
+			 *
+			 * @param int    $quality   Quality level between 1 (low) and 100 (high). null for applying default as specified in WP_Image_Editor
+			 * @param string $size      Slug of image size
+			 */
+			$quality = apply_filters( 'jpeg_quality', null, $size );
+
+			$_sizes[ $size ] = array( 'width' => $width, 'height' => $height, 'crop' => $crop, 'quality' => $quality );
 		}
 
 		$meta['sizes'] = array_merge( $meta['sizes'], $img->multi_resize( $_sizes ) );