How to qualitatively compress an image?

Question

Android

Tell me how to compress the image better, now I have the following code and the following results:

//путь к изображению
                fullPictureObj.get(0).getPath();

                File decodeFile = new File(fullPictureObj.get(0).getPath());

                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inPreferredConfig = Bitmap.Config.ARGB_8888;
                Bitmap bitmapFull = BitmapFactory.decodeFile(fullPictureObj.get(0).getPath(), options);
                int imageHeight = options.outHeight;
                int imageWidth = options.outWidth;

                //Ориентация изображения
                Bitmap rotateBitmap = rotateBitmap(bitmapFull,
                        fullPictureObj.get(0).getRealOrientation());
                bitmapFull.recycle();

                int newWidth = 960;
                float k = (float) imageWidth/ (float) newWidth;
                float newHeightFloat = ((float) imageHeight/k);
                int newHeight = (int) newHeightFloat;


                
                /*
                int maxSize = 960;
                if(imageWidth > imageHeight){
                    newWidth = maxSize;
                    newHeight = (imageHeight * maxSize) / imageWidth;
                } else {
                    newHeight = maxSize;
                    newWidth = (imageWidth * maxSize) / imageHeight;
                }
                */


                Bitmap bitmapMini = Bitmap.createScaledBitmap(rotateBitmap, newWidth, newHeight, false);
               // rotateBitmap.recycle();

                //Сохраняю изображения для сравнения и теста
                MediaStore.Images.Media.insertImage(getContext().getContentResolver(),
                        bitmapMini, "test" , null);

Original: 4608 X 3456 4.78MB
Result: 960 X 720 60.6KB
With compression, the weight is not critical, but the result should not exceed a width of 1000px
Original: https://pp.userapi.com/c846018/v846018037/e0d60/r9... ( not quite original)
Result: https://pp.userapi.com/c846018/v846018037/e0d69/Hx...
How can I better reduce the width and height of the image? As can be seen from the example, the result, to put it mildly, is not very good.

Answer 1

The result is "not very", because you have hellishly strong compression, which in this code is at the mercy of the system itself (and there - xs what coefficient it uses).
See this discussion: https://stackoverflow.com/questions/36487971/how-t...