Is it possible to zip a bytearray/bitmap to a specific size?

Question

I was trying to save images into the SQLite database, but even I compress and rescale my bitmap, the file was still too big, especially when you capture a image from the phone's camera.

Is there anyway to zip the bytearray/bitmap into a specific size like from 4mb to 500kb? If yes, how can I do that?

private void uriToFile(Uri uri, File sdImageMainDirectory) throws IOException {

        Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
        OutputStream stream = new FileOutputStream(sdImageMainDirectory);

        int bitmapWidth = bitmap.getWidth();
        int bitmapHeight = bitmap.getHeight();
        int maxSize = 10;

        float bitmapRatio = (float) bitmapWidth / (float) bitmapHeight;

        if(bitmapRatio > 0){
            bitmapWidth = maxSize;
            bitmapHeight = (int) (bitmapWidth / bitmapRatio);
        }
        else{
            bitmapHeight = maxSize;
            bitmapWidth = (int) (bitmapHeight * bitmapRatio);
        }
        bitmap.createScaledBitmap(bitmap, bitmapWidth, bitmapHeight, true);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 30, stream);
        stream.flush();
        stream.close();
}

So you want to reduce the size to 1/8th? Seems a bit extreme, no? You can resize the image, but compression isn't magic. — 323go, Dec 18 '15 at 03:18
I just need the photo to be able to store into a single row from the database since each row can only fits 2MB, but I have already resize and compress the bitmap it still over 2MB — Johnny Cheuk, Dec 18 '15 at 03:19
Then make it smaller. Once again, zip isn't magic. And most image formats are already compressed, making them very poor candidates for further compression. It's generally a bad idea to store large binary data in a database. Consider just storing them as files in the private folder, and keeping a reference in your database. — 323go, Dec 18 '15 at 03:21
@323go I've posted my method to zip a image, I think it's small enough already — Johnny Cheuk, Dec 18 '15 at 03:25
There is no "zip" in the code you posted. You're just compressing the image. — 323go, Dec 18 '15 at 03:28
@323go Sorry I think I used the wrong word. So how can I compress a image from 400mb to less than 500kb — Johnny Cheuk, Dec 18 '15 at 03:30

score 1 · Accepted Answer · answered Dec 18 '15 at 03:30

1

You're not actually compressing the scaled image, but rather, the original one. Change the last four lines to this:

Bitmap scaled = bitmap.createScaledBitmap(bitmap, bitmapWidth, bitmapHeight, true);
scaled.compress(Bitmap.CompressFormat.JPEG, 30, stream);
stream.flush();
stream.close();

createScaledBitmap() returns the scaled bitmap, and you just lost the result.

You should be able to set maxSize to 1000 and see file sizes below 500k.

answered Dec 18 '15 at 03:30

323go

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That's it, you just save my entire application, thank you. – Johnny Cheuk Dec 18 '15 at 03:34
So glad you got it resolved, and it turned out to be something so simple. – 323go Dec 18 '15 at 03:35

score 1 · Answer 2 · answered Dec 18 '15 at 03:58

you can use these codes also

 String[] filePathColumn = {MediaStore.Images.Media.DATA};
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
img_Decodable_Str = cursor.getString(columnIndex);
cursor.close();

  **Bitmap bitmapImage = BitmapFactory.decodeFile(img_Decodable_Str);
  Bitmap converetdImage = getResizedBitmap(bitmapImage, 500);**

Is it possible to zip a bytearray/bitmap to a specific size?

2 Answers2