The following code is what I got so far. However, there are 2 issues:
1. I want both inner and outer glow effects, which looking similar to
the Photoshop's blending options. But I only managed to make the outer
glow, if I set BlurMaskFilter.Blur.INNER or other value, the whole
image is blocked, instead of just edges.
2. Despite I set "FF" as alpha value, the glow color is still very
dark.
Bitmap alpha = origin.extractAlpha();
BlurMaskFilter blurMaskFilter = new BlurMaskFilter(5,
BlurMaskFilter.Blur.OUTER);
Paint paint = new Paint();
paint.setMaskFilter(blurMaskFilter);
paint.setColor(0xffffffff);
Canvas canvas = new Canvas(origin);
canvas.drawBitmap(alpha, 0, 0, paint);
return origin;
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