Accuracy tweak to float->int conversions in the Colour class.

modules/juce_graphics/colour/juce_Colour.cpp

@@ -26,7 +26,8 @@ namespace ColourHelpers
 {
     static uint8 floatToUInt8 (const float n) noexcept
     {
-        return n <= 0.0f ? 0 : (n >= 1.0f ? 255 : (uint8) (n * 255.0f));
+        // the multiplier has a small extra amount to allow for FP rounding errors.
+        return n <= 0.0f ? 0 : (n >= 1.0f ? 255 : (uint8) (n * 255.1f));
     }
 
     // This is an adjusted brightness value, based on the way the human