I am looking for a feature that allows for Blending if Gray. If working in photoshop you double click the layer you are working on in the layers panel and a panel opens for layer styles. In the center of the panel towards the bottom there are sliders that allow you to blend grays away. It is very handy when I work with various glassware. As an example if a drinking glass is photographed on a white background and I move the sliders the white will just vanish leaving the glass only.
Is there a way to do this in AP? I find the blend options you describe but there is no way to blend for grays. Your choices are Master, Red, Green and Blue.
Thank you in advance for any help with this.