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diff --git a/magick/pixel.h b/magick/pixel.h
index 660d0db8c0ef2c58e19d6840332ca9bed3286fa7..d66498356214d5eee65d6b8ca21887c129ef28a3 100644 (file)
--- a/magick/pixel.h
+++ b/magick/pixel.h
@@ -35,7 +35,7 @@ extern "C" {
 #define GetGreenPixelComponent(p) ((p)->green)
 #define GetBluePixelComponent(p) ((p)->blue)
 #define GetOpacityPixelComponent(p) ((p)->opacity)
-#define GetAlphaPixelComponent(p) (QuantumRange-(p)->opacity)
+#define GetAlphaPixelComponent(p) ((Quantum) (QuantumRange-(p)->opacity))
 #define GetIndexPixelComponent(p) ((p)->index)
 
 #define SetRedPixelComponent(q,component) ((q)->red=(component))