ActionScript 2.0 Language Reference - Adobe Help and Support

The source channel value and destination channel value can be one of the following values or
the sum of any of the values:
■ 1 (red)
■ 2 (green)
■ 4 (blue)
■ 8 (alpha)
Availability: ActionScript 1.0; Flash Player 8
Parameters
sourceBitmap:BitmapData - The input bitmap image to use. The source image can be a
different BitmapData object or it can refer to the current BitmapData object.
sourceRect:Rectangle - The source Rectangle object. If you only want to copy channel
data from a smaller area within the bitmap, specify a source rectangle that is smaller than the
overall size of the BitmapData object.
destPoint:Point - The destination Point object that represents the upper-left corner of the
rectangular area where the new channel data is placed. If you want to copy channel data from
one area to a different area in the destination image, specify a point other than (0,0).
sourceChannel:Number - The source channel. Use a value from the set (1,2,4,8), which
represent red, green, blue, and alpha channels, respectively, or a sum of any of the values.
destChannel:Number - The destination channel. Use a value from the set (1,2,4,8), which
represent red, green, blue, and alpha channels, respectively, or a sum of any of the values.
Example
The following example shows how to copy a source ARGB channel from a BitmapData object
back onto itself at a different location:
import flash.display.BitmapData;
import flash.geom.Rectangle;
import flash.geom.Point;
var myBitmapData:BitmapData = new BitmapData(100, 80, false, 0x00CCCCCC);
var mc:MovieClip = this.createEmptyMovieClip("mc",
this.getNextHighestDepth());
mc.attachBitmap(myBitmapData, this.getNextHighestDepth());
mc.onPress = function() {
myBitmapData.copyChannel(myBitmapData, new Rectangle(0, 0, 50, 80), new
Point(51, 0), 3, 1);
}
312 ActionScript classes