Open the image you are going to use. Add a new layer and Flood fill with white. Highlight your background layer and add a new layer . This will be our Satin Layer. Using your dropper select a foreground and background color from your image.
Flood fill the layer with the gradient.
Make your Mask Layer active. Now highlight your Satin Layer 12. Make sure you erase all pixels. Switch off your background layer view to check. When you are happy that the center is nice and clean, Deselect .