Secondary Color Correction Area Selection (Mask) This filter makes a snapshot of the frame before a keyframable Chroma Key selection with more advanced options (e.g. different color models) is applied. Use it together with the mask_apply effect, that uses a transition to composite the current frame's image over the snapshot. The typical use case is to add effects in the following sequence: this effect, zero or more effects, mask_apply. Marko Cebokli, Dan Dennedy Filter Color to select Invert selection RGB,ABI,HCI Color Model Box,Ellipsoid,Diamond Shape Hard,Fat,Normal,Skinny,Slope Edge mode Red / Hue Delta Green / Chroma Delta Blue / Intensity Delta Soften Write on clear,Max,Min,Add,Subtract Operation