gdkPixbufRenderThresholdAlpha {RGtk2} | R Documentation

## gdkPixbufRenderThresholdAlpha

### 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.

### Usage

    gdkPixbufRenderThresholdAlpha(object, bitmap, src.x, src.y, dest.x,
        dest.y, width = -1, height = -1, alpha.threshold)

### Arguments

``object`` | A pixbuf.
``bitmap`` | Bitmap where the bilevel mask will be painted to.
``src.x`` | Source X coordinate.
``src.y`` | source Y coordinate.
``dest.x`` | Destination X coordinate.
``dest.y`` | Destination Y coordinate.
``width`` | Width of region to threshold, or -1 to use pixbuf width
``height`` | Height of region to threshold, or -1 to use pixbuf height
``alpha.threshold`` | Opacity values below this will be painted as zero; all other values will be painted as one.

### Author(s)

Derived by RGtkGen from GTK+ documentation

[Package RGtk2 version 2.20.40 Index]