Applying Tint to a Mask

Does anyone have any experience with applying a tint to a Mask in Motion 2.0? I am trying to define an area in which I want to change the tint from the origional red color to a glowy type of yellow? I have tried moving around the layers to see if the tint I am applying is not showing up because of another layer on top. I have also tried messing with alpha layers and opacity of the mask and had no success with that. Any idea how to change a red apple (orig footage) to a yellow tinted apple?

Thanks in advance.

You can't tint a mask. Try duplicating the object you want to mask on top of the original, then apply a desaturate filter, then a colorize filter, and that should let you tint it yellow. Then, if you goal is to only have part of the object yellow, mask the upper object as needed to reveal the lower object.
Mark