I can't seem to apply a tint to opaque grayscale images.  Am I doing something wrong here? I have transparent black and white images of left and right wings.  I want to be able to change the wing colors and I thought the simplest way would be to use neutral tone colors and apply tints to them.

<snip>

1.     tint(#E81313,255);
2.    
3.     image(rwing,eyeSize*4,0,sin(flap)*(eyeSize*4) +1,eyeSize*4);
4.     image(lwing,2,0,-sin(flap)*(eyeSize*4) +1,eyeSize*4);
5.     flap += flapStep; /// modifying the flapstep changes wingspeed
6.     noTint();

<snip>

Full project development code located in WeirdThings class at http://pages.suddenlink.net/tls/std_applet_sm/