How to reduce an Image file size

Question

I use this function to reduce the size of image before uploading it,But using below method my file size is increasing

Before use below code my file size---> 157684

after using this code my file size ----->177435

Can some one help me please how can i reduce file size before upload to server

code:

public File saveBitmapToFile(File file){
    try {

        // BitmapFactory options to downsize the image
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        o.inSampleSize = 6;
        // factor of downsizing the image

        FileInputStream inputStream = new FileInputStream(file);
        //Bitmap selectedBitmap = null;
        BitmapFactory.decodeStream(inputStream, null, o);
        inputStream.close();

        // The new size we want to scale to
        final int REQUIRED_SIZE=75;

        // Find the correct scale value. It should be the power of 2.
        int scale = 1;
        while(o.outWidth / scale / 2 >= REQUIRED_SIZE &&
                        o.outHeight / scale / 2 >= REQUIRED_SIZE) {
            scale *= 2;
        }

        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        inputStream = new FileInputStream(file);

        Bitmap selectedBitmap = BitmapFactory.decodeStream(inputStream, null, o2);
        inputStream.close();

        // here i override the original image file
        file.createNewFile();
        FileOutputStream outputStream = new FileOutputStream(file);

        selectedBitmap.compress(Bitmap.CompressFormat.JPEG, 100 , outputStream);

        return file;
    } catch (Exception e) {
        return null;
    }
}

Bitmap.CompressFormat.JPEG, 100 , outputStream to Bitmap.CompressFormat.JPEG, REQUIRED_SIZE, outputStream — Divyesh Patel, Apr 27 '17 at 09:34
100 is good quality 0 is bed quality . so choose as per compression with quality ratio to reduce your file size — Vishal Patel, Apr 27 '17 at 09:39
http://stackoverflow.com/questions/8417034/how-to-make-bitmap-compress-without-change-the-bitmap-size — IntelliJ Amiya, Apr 27 '17 at 09:39

Chetan Pushpad · Answer 1 · 2017-04-27T11:32:17.703

1

Change this line:

    selectedBitmap.compress(Bitmap.CompressFormat.JPEG, 100 , outputStream);

to

int mCompressedSize = 50; // 0 is lowest and 100 original
selectedBitmap.compress(Bitmap.CompressFormat.PNG, mCompressedSize, outputStream);

Hope this will help.

edited Apr 27 '17 at 11:32

answered Apr 27 '17 at 09:37

Chetan Pushpad

345
1
9

1

REQUIRED_SIZE ? That 100 is a compress quality. – greenapps Apr 27 '17 at 09:46

score 1 · Answer 2 · answered Apr 27 '17 at 09:44

This what I use to reduce my image size without compressing :

public static Bitmap getResizedBitmap(Bitmap bitmap, int newWidth, int newHeight) {
    Bitmap scaledBitmap = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);

    float ratioX = newWidth / (float) bitmap.getWidth();
    float ratioY = newHeight / (float) bitmap.getHeight();
    float middleX = newWidth / 2.0f;
    float middleY = newHeight / 2.0f;

    Matrix scaleMatrix = new Matrix();
    scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);

    Canvas canvas = new Canvas(scaledBitmap);
    canvas.setMatrix(scaleMatrix);
    canvas.drawBitmap(bitmap, middleX - bitmap.getWidth() / 2, middleY - bitmap.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));

    return scaledBitmap;
}

You just need to enter correct new height and width to fit your needs

score 1 · Answer 3 · answered Apr 27 '17 at 09:59

We want to make thumbnail of an image, so we need to first take the ByteArrayOutputStream and then pass it into Bitmap.compress() method.

ByteArrayOutputStream bytes = new ByteArrayOutputStream();
youBitmapImage.compress(Bitmap.CompressFormat.JPEG, 90, bytes);

more about the function, from the docs

score 1 · Answer 4 · answered Apr 27 '17 at 10:10

If your output file is larger:

it can mean that scale is wrong. And you save the file with 100% quality so it can grow
compression on the input file is extremely heavy and even though you scale it, using no compression on the output still generates a larger file

score 0 · Answer 5 · answered Apr 27 '17 at 09:41

Try

int compressionRatio = 2; //1 == originalImage, 2 = 50% compression, 4=25% compress
File file = new File (imageUrl);
try {
    Bitmap bitmap = BitmapFactory.decodeFile (file.getPath ());
    bitmap.compress (Bitmap.CompressFormat.JPEG, compressionRatio, new FileOutputStream (file));
}
catch (Throwable t) {
    Log.e("ERROR", "Error compressing file." + t.toString ());
    t.printStackTrace ();
}

How to reduce an Image file size

5 Answers5