Index: src/wp-includes/media-template.php
===================================================================
--- src/wp-includes/media-template.php	(revision 32484)
+++ src/wp-includes/media-template.php	(working copy)
@@ -736,11 +736,29 @@
 			<span><?php _e('Columns'); ?></span>
 			<select class="columns" name="columns"
 				data-setting="columns">
-				<?php for ( $i = 1; $i <= 9; $i++ ) : ?>
+				<?php
+				/**
+				 * Allows change of min number of columns dropdown in Media Gallery
+				 *
+				 * @since 4.3
+				 *
+				 * @param int $min Default columns_min of 1
+				 */
+				$min_columns = apply_filters( 'media_gallery_columns_min', 1 );
+				/**
+				 * Allows change of max number of columns dropdown in Media Gallery
+				 *
+				 * @since 4.3
+				 *
+				 * @param int $max Default columns_max of 9
+				 */
+				$max_columns = apply_filters( 'media_gallery_columns_max', 9 );
+
+				for ( $i = intval( $min_columns ); $i <= intval( $max_columns ); $i++ ) : ?>
 					<option value="<?php echo esc_attr( $i ); ?>" <#
 						if ( <?php echo $i ?> == wp.media.galleryDefaults.columns ) { #>selected="selected"<# }
 					#>>
-						<?php echo esc_html( $i ); ?>
+						<?php echo esc_html( apply_filters( 'media_gallery_columns_name', $i ) ); ?>
 					</option>
 				<?php endfor; ?>
 			</select>