Deep blues were getting purple. Possibly due to rounding errors since clamping values that are expected to be between 0 and 1 fixes it.

Fixing #16.

Author: michelf

Filter/SimDaltonismFilter.m

@@ -229,6 +229,9 @@ void main()
 		// now shift *all* three proportional to the greatest shift...
 		s_rgb = s_rgb + ( adjust * d_rgb );
 
+		// fix issue where blues were getting purple
+		s_rgb = clamp(s_rgb, 0., 1.);
+
 		// anomalize
 		s_rgb = mix(c_rgb, s_rgb, anomalize);