pngsave: ensure 8-bit palette images can be created (#3031)

lovell · web-flow · commit b58b7bd416a3 · 2022-09-08T09:10:02.000+01:00
diff --git a/libvips/foreign/pngsave.c b/libvips/foreign/pngsave.c
@@ -145,9 +145,9 @@ vips_foreign_save_png_build( VipsObject *object )
 		png->bitdepth < 8 )
 		png->palette = TRUE;
 
-        /* Disable palettization for >8 bit save.
-         */
-        if( png->bitdepth >= 8 )
+	/* Disable palettization for >8 bit save.
+	 */
+	if( png->bitdepth > 8 )
 		png->palette = FALSE;
 
 	if( vips__png_write_target( in, png->target,
diff --git a/libvips/foreign/spngsave.c b/libvips/foreign/spngsave.c
@@ -613,9 +613,9 @@ vips_foreign_save_spng_build( VipsObject *object )
 		spng->bitdepth < 8 )
 		spng->palette = TRUE;
 
-        /* Disable palettization for >8 bit save.
-         */
-        if( spng->bitdepth >= 8 )
+	/* Disable palettization for >8 bit save.
+	 */
+	if( spng->bitdepth > 8 )
 		spng->palette = FALSE;
 
 	if( vips_foreign_save_spng_write( spng, in ) ) {
