Google this:
ColorMatrix threshold
Here is a link that may be useful:
http://keywon.com/wiki/index.php?title=ColorMatrix
Draw your bitmap (newBitmap) into a bitmap-backed canvas (c) that has
a ColorMatrixColorFilter set with a ColorMatrix that represents a so-
called 'threshold' filter (see above link).
On Apr 1, 5:14 pm, paladin <quoti...@gmail.com> wrote:
> I am using the following code to flip each pixel in a bitmap to black
> or white:
>
> for(int x = 0; x < newBitmap.getWidth(); x++) {
> for(int y = 0; y < newBitmap.getHeight(); y++) {
> int point = newBitmap.getPixel(x, y);
> if(point < Color.GRAY) {
> paint.setColor(Color.BLACK);
> c.drawPoint(x, y, paint);
> } else {
> paint.setColor(Color.WHITE);
> c.drawPoint(x, y, paint);
> }
> }
> }
>
> It works, but it is extraordinarily slow for the size image I'm using
> (half the resolution of the camera, 1296x972). I have also tried
> setPixel, and I'm getting about the same performance. Anyone out there
> know of a faster way to do this?
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