Yesterday, I posted this topic regarding the inversion of a bitmap
alpha channel, but the root of the problem is that I am trying to
find a workaround for the GlowFilter knockout effect.
For some reason, when I programatically apply a GlowFilter to a
BitmapData object, and pass inner = false, with knockout = true, I
get this bizarre zebra effect.... I've provided code and a link to a
side by side comparison screenshot.
Here is an example of the code I am using:
var filter = new GlowFilter(0xFFFFFF, 1, 5, 5, 5, 1, false, true);
myBitmap.applyFilter(myBitmap, myBitmap.rectangle, new Point(0, 0),
filter);
Following is a screen shot of the issue. The left side is the result
when simply using the GlowFilter without passing inner or knockout,
and the right side is the strange zebra effect I get when I use the
above code.
http://download.danro.net/flashcoders/glowfilter_bug.jpg
Has anyone else dealt with this?
-Danro
On Jul 7, 2006, at 3:29 PM, Dan Rogers wrote:
Hi gang,
I am trying to invert the alpha channel of a BitmapData object and
destructively apply it to another bitmap using copyPixels. Has
anyone inverted an alpha channel on a bitmap? I assume use
applyFilter with ColorMatrixFilter, but I am not very swift in
figuring out the correct color matrix settings to use.
Thanks,
-Danro
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