Converting Bitmap in memory to Bitmap with Bitmap.Config.RGB_565

Question

I have a loaded Bitmap which I would like to convert to set the config to Bitmap.Config.RGB_565. Is there a simple way of converting a Bitmap to th

Answer 1

You can also try this:

Bitmap converted = original.copy(Config.RGB_565, false);

From the documentation of Bitmap.copy():

Tries to make a new bitmap based on the dimensions of this bitmap, setting the new bitmap's config to the one specified, and then copying this bitmap's pixels into the new bitmap. If the conversion is not supported, or the allocator fails, then this returns NULL.

Looking through the native source code, you should be fine converting between any values of Bitmap.Config.

Answer 2

Found the answer here https://stackoverflow.com/a/12148450/1364673, thanks to siliconeagle.

The solution is to create a new bitmap with the required encoding as per link above example.

Answer 3

I haven't tested this but it should work:

private Bitmap convert(Bitmap bitmap, Bitmap.Config config) {
    Bitmap convertedBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), config);
    Canvas canvas = new Canvas(convertedBitmap);
    Paint paint = new Paint();
    paint.setColor(Color.BLACK);
    canvas.drawBitmap(bitmap, 0, 0, paint);
    return convertedBitmap;
}

call the methods like this:

Bitmap convertedBitmap = convert(bitmap, Bitmap.Config.RGB_565);

You can do all kinds of additional transformations like rotating, stretching etc. if you use the drawBitmap with a Matrix.