CODEWITHSUNDEEP
androidbitmap
dasdasd
dasdasd

Reputation: 2031

Bitmap compress doesn't changing bitmap byte size

I'm trying to reduce bitmap size by using compress method.

This is my code:

public Bitmap compressImage(Bitmap image) {
        Bitmap immagex = image;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        Log.i("before compress", immagex.getByteCount()+"");

        boolean compress = immagex.compress(Bitmap.CompressFormat.JPEG, 10, baos);

        if(compress)
            Log.i("after compress", immagex.getByteCount()+"");
        else
            Log.i("bad compress", "bad compress");

        return immagex;
    }

When i check my logs i get:

11-28 11:10:38.252: I/before compress(2429): 374544
11-28 11:10:38.262: I/after compress(2429): 374544

Why is the compress does not work?

UPDATE:

I tried this code:

public Bitmap compressImage(Bitmap image) {
        Bitmap immagex = image;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        Log.i("before compress", immagex.getByteCount()+"");

        boolean compress = immagex.compress(Bitmap.CompressFormat.JPEG, 10, baos);

        Log.i("after compress 2", decodeSampledBitmapFromByte(image.getWidth(), image.getHeight(), baos.toByteArray()).getByteCount()+"");

        return immagex;
    }

Still the same byte count

11-28 11:33:04.335: I/before compress(3472): 374544
11-28 11:33:04.395: I/after compress 2(3472): 374544

Upvotes: 7

Views: 3971

Answers (3)

rlib
rlib

Reputation: 7867

Compression does not change the size of the bitmap. You should look at the size of the output byte stream which contains compressed data.

Upvotes: 0

Kanifnath Modak
Kanifnath Modak

Reputation: 172

Following is the code for reducing the bitmap size and convert it to base64,

    Bitmap newBitmap = Bitmap.createScaledBitmap(bitmap, 50, 50, true);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    newBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] byteArray = baos.toByteArray();
    String imageEncoded = Base64.encodeToString(byteArray, Base64.DEFAULT);

    Log.e("Base 64 String", imageEncoded);

Upvotes: 3

Bhanu Sharma
Bhanu Sharma

Reputation: 5145

Using Bitmap.compress() you just specify compression algorithm and by the way compression operation takes rather big amount of time. If you need to play with sizes for reducing memory allocation for your image, you exactly need to use scaling of your image using Bitmap.Options, computing bitmap bounds at first and then decoding it to your specified size.

The best sample that I found on StackOverflow is this one. Strange out of memory issue while loading an image to a Bitmap object

Upvotes: 0

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