Android : How to convert the compressed images to string with minimum size

Question

In my android application i am using whatsapp like image compression and after that i convert the compressed image bitmap to string using Base64 encoding,what i noticed is that

Answer 1

There's one big difference in your images though.

The image you store as a file is stored as a JPEG

bitmapImg.compress(Bitmap.CompressFormat.JPEG, 80, out);

while the Base64 encoded string is a PNG

bitmapImg.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOS);

This can explain the size differences. Another thing could be, that bitmapImg changed it's contents inbetween both compressions as well.