# Method GTK2.GdkPixbuf()->render_threshold_alpha()

Method render_threshold_alpha

  ``GTK2.GdkBitmap` render_threshold_alpha(`int` `src_x`, `int` `src_y`, `int` `dest_c`, `int` `dest_y`, `int` `width`, `int` `height`, `int` `alpha_threshold`)`

Description

  Takes the opacity values in a rectangular portion of a pixbuf and thresholds them to produce a bi-level alpha mask that can be used as a clipping mask for a drawable.