X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fmodules%2Fplus%2Ffilter_lift_gamma_gain.c;h=fe3468261a8d54471c1017f911b5c1d43fcf6aa4;hb=8e3b1caccc7ec2de5cb5eaf3ecbcd868512569a3;hp=5c1f74756cd5124f02c2b7cf0087a205184cd0ba;hpb=38504d6c04b6fc6f942d511b468ba316e6fa8058;p=mlt

diff --git a/src/modules/plus/filter_lift_gamma_gain.c b/src/modules/plus/filter_lift_gamma_gain.c
index 5c1f7475..fe346826 100644
--- a/src/modules/plus/filter_lift_gamma_gain.c
+++ b/src/modules/plus/filter_lift_gamma_gain.c
@@ -56,25 +56,30 @@ static void refresh_lut( mlt_filter filter, mlt_frame frame )
 		for( i = 0; i < 256; i++ )
 		{
 			// Convert to gamma 2.2
-			double gamma22 = pow( (double)i / 255.0, 1.0f / 2.2f );
+			double gamma22 = pow( (double)i / 255.0, 1.0 / 2.2 );
 			double r = gamma22;
 			double g = gamma22;
 			double b = gamma22;
 
 			// Apply lift
-			r += rlift * ( 1 - r );
-			g += glift * ( 1 - g );
-			b += blift * ( 1 - b );
+			r += rlift * ( 1.0 - r );
+			g += glift * ( 1.0 - g );
+			b += blift * ( 1.0 - b );
 
 			// Apply gamma
-			r = pow( r, 2.2f / rgamma );
-			g = pow( g, 2.2f / ggamma );
-			b = pow( b, 2.2f / bgamma );
+			r = pow( r, 2.2 / rgamma );
+			g = pow( g, 2.2 / ggamma );
+			b = pow( b, 2.2 / bgamma );
 
 			// Apply gain
-			r *= pow( rgain, 1.0f / rgamma );
-			g *= pow( ggain, 1.0f / ggamma );
-			b *= pow( bgain, 1.0f / bgamma );
+			r *= pow( rgain, 1.0 / rgamma );
+			g *= pow( ggain, 1.0 / ggamma );
+			b *= pow( bgain, 1.0 / bgamma );
+
+			// Clamp values
+			r = r < 0.0 ? 0.0 : r > 1.0 ? 1.0 : r;
+			g = g < 0.0 ? 0.0 : g > 1.0 ? 1.0 : g;
+			b = b < 0.0 ? 0.0 : b > 1.0 ? 1.0 : b;
 
 			// Update LUT
 			private->rlut[ i ] = (int)(r * 255.0);