...

diff --git a/MagickCore/option.c b/MagickCore/option.c
index 1a93a5bc4044a89ce0b864422568597127c5813c..a051e761458549702d2a522a7bdf2a5561063e85 100644 (file)
--- a/MagickCore/option.c
+++ b/MagickCore/option.c
@@ -1531,6 +1531,7 @@ static const OptionInfo
     { "M", MagentaPixelChannel, UndefinedOptionFlag, MagickFalse },
     { "Magenta", MagentaPixelChannel, UndefinedOptionFlag, MagickFalse },
     { "Meta", MetaPixelChannel, UndefinedOptionFlag, MagickFalse },
+    { "O", AlphaPixelChannel, UndefinedOptionFlag, MagickFalse },
     { "R", RedPixelChannel, UndefinedOptionFlag, MagickFalse },
     { "ReadMask", ReadMaskPixelChannel, UndefinedOptionFlag, MagickFalse },
     { "Red", RedPixelChannel, UndefinedOptionFlag, MagickFalse },