Keying white backgrouond that is composed of different values

Hello
I need to key out a white background that is coming from a video and the white is composed of many values. As you can see on the attached snap shot, I have mostly succeeded in keying out the white but still some values are kept and I don’t seem to find out which ones?
Can somebody help me with parametrizing the keying interface?
Thanks

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Try adding a premultiply node? That is after the key node.

Thanks I did add an AlphaConvert chained to a SetAlpha and it did the work. However I am not sure it is the right way to do this, but it worked…
Thanks

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