The BLENDED CLIP Deinterlace method is designed mostly for experimentation by those interested in what works for video deinterlacing. When it is selected it will pop up a control panel with many controls to adjust various parameters. These all correspond to Blc... parameters in the [Deinterlace] section of the DScaler.ini file and are documented there. It is probably not the single best method for anything but it can be used to create custom deinterlace methods for special purposes. These can be saved in a separate ini file and invoked by a command line parameter when starting DScaler.exe. Somewhat CPU intensive