How would I scale to get a fixed image resolution (width=768) on any smartphone?

[MrSilverstein]

I take pictures with the fotoapparat.io and in the whenDone() I have my BitmapPhoto object.

Since I dont need that those big resolutions I would be satisfied with photos where the width has 768 pixels. The height would depend on smartphone cameras aspect ratio. On 4:3 cameras the height would be 576 pixels.

So far so good.

To scale the image down I use

 photoResult.toBitmap(
                    new Function1<Resolution, Resolution>() {
                        @Override
                        public Resolution invoke(Resolution resolution) {
                            float scale = (float) 768 / resolution.width;
                            return scaled(scale).invoke(resolution);
                        }
                    }
            )

But on some devices I get lower or bigger resolutions as an end photo.

How can I get fixed width x (e.g. 768) pixels, for any smaertphones, with any camera resolutions and with any screen sizes?

[MrSilverstein]

Also

            photoResult.toBitmap(
                new Function1<Resolution, Resolution>() {
                    @Override
                    public Resolution invoke(Resolution resolution) {
                        int height = 1024;
                        int width = 768;
                        Resolution r = new Resolution(width, height);
                        return scaled(1.0F).invoke(r);
                    }
                }
            )

did not work very well. The results size was ok, but the picture was distorted..

[MrSilverstein]

So no solution here?

[Diolor]

You cannot. You can always take higher resolution images and scale them down but this library has nothing to do with image scaling