palette: change alpha reporting for palette formats

Only return TRUE if the format has a dedicated alpha component.

diff --git a/babl/babl-palette.c b/babl/babl-palette.c
index 893bc6adffaf56782b91d90549fa5777168b38ae..535924383fbded3e9fa2f366c5bc8bf806be11b8 100644 (file)
--- a/babl/babl-palette.c
+++ b/babl/babl-palette.c
@@ -488,7 +488,6 @@ const Babl *babl_new_palette (const char  *name,
     "I",
     "luma",
     "chroma",
-    "alpha",
     NULL);
   alpha = babl_component ("A");