Reduce Image size while maintaining the quality

Question

I just want to know the different factors on which I can work on and reduce the size of any image by maintaining its quality.

Like Bitmap.compress is the one option for me.

Also which is the best encoding format (Jpeg, Png) which maintain quality with minimal size.

I may not answer your question but the tool tiny png https://tinypng.com/ reduce images by ~70% and the quality is the same — Nir Hartmann, May 14 '14 at 06:03
http://stackoverflow.com/questions/23494419/how-to-take-a-photo-with-the-camera-app-and-also-save-as-thumbnail-and-as-full-s/23494960#23494960 — Sandeep Tiwari, May 14 '14 at 06:08
'reduce size' means 'Same picture, stored using less bytes' or 'downsize picture to fit on my little screen'? — tofi9, May 14 '14 at 06:11
@NirHartmann It seems a good tool but I want to use it in my Android application. Thanks Man — Krishnakant Dalal, May 14 '14 at 08:08
It works great for me.[Try this...][1] [1]: http://stackoverflow.com/questions/18573774/how-to-reduce-an-image-file-size-before-uploading-to-a-server?answertab=votes#tab-top — Krishnakant Dalal, May 14 '14 at 10:34

score 0 · Answer 1 · answered May 14 '14 at 06:03

0

It depends of bitmap content. If you have a text or other solid color or contrast areas on your bitmap then PNG is your choice, because it preserves image quality.

If it's a picture from camera then JPG is best.

answered May 14 '14 at 06:03

vadimvolk

711
4
15

score 0 · Answer 2 · answered May 14 '14 at 06:07

// try this way,hope this will help you...

private Bitmap decodeFileFromPath(String path){
        Uri uri = getImageUri(path);
        InputStream in = null;
        try {
            in = getContentResolver().openInputStream(uri);

            //Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;

            BitmapFactory.decodeStream(in, null, o);
            in.close();


            int scale = 1;
            int inSampleSize = 1024;
            if (o.outHeight > inSampleSize || o.outWidth > inSampleSize) {
                scale = (int) Math.pow(2, (int) Math.round(Math.log(inSampleSize / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5)));
            }

            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            in = getContentResolver().openInputStream(uri);
            Bitmap b = BitmapFactory.decodeStream(in, null, o2);
            in.close();

            return b;

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

score 0 · Answer 3 · answered May 14 '14 at 06:09

0

Any lossless file format will not mess up with your bytes:

PNG (default configuration = lossless)
Tiff lossless (zip or lzw)
JPEG lossless (a special type of JPEG. I don't think Android supports this out of the box)

answered May 14 '14 at 06:09

tofi9

5,775
4
29
50

Reduce Image size while maintaining the quality

3 Answers3