如何解码和编码base64图像，而不会失去质量和尺寸

Question

Am encoding an image from android to base64 with this code:

ByteArrayOutputStream stream = new ByteArrayOutputStream();
            bmp.compress(Bitmap.CompressFormat.PNG, 90, stream); //compress to which format you want.
            byte [] byte_arr = stream.toByteArray();
            image_str = Base64.encodeToString(byte_arr, Base64.DEFAULT);

and than insert it into mysql data base, than decode it with php using that code:

$filename_path = md5(time().uniqid()).".jpeg"; 
$decoded=base64_decode($image_str);
 file_put_contents("uploads/".$filename_path,$decoded);
//echo '<img src="uploads/".$filename_path"/>';
echo '<img src="uploads/'.$filename_path.'"/>';

it's working all fine i can see the picture and there is no errors, but the problem is am losing like about 80% of the quality and the size , how can i fix that please.

Answer 1

I think if you make the compress format JPEG , and reduce the quality of the image to 50 , that should do the trick:

ByteArrayOutputStream baos = new  ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 50, baos);
byte [] b = baos.toByteArray();
return Base64.encodeToString(b, Base64.DEFAULT);