Image becoming unrecognizable

Question

Steps my application performs:-

Download a large no of images and save them on the SDCard.
Load every image into Bitmap and resize them, after resizing replace this resized image with the original one.

My code:-

Bitmap myimage = loadimage(path+temppos+".jpg");
Bitmap finalimage = getResizedBitmap(myimage,width,height);
//save image 
.....
//recyclebitmap 
myimage.recycle();
finalimage.recycle();

loadimage:-

public Bitmap loadimage(String path)
    {

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        options.inDither=true;
        options.inPurgeable=true;
        options.inInputShareable=true;
        return BitmapFactory.decodeFile(path, options);
    }

Now I' populating these images on gridview.

Output(Before):- enter image description here

Output (After):- enter image description here

Where Before corresponds to initially when only a few images are downloaded. And After corresponds to after all the images are downloaded.

Now, I think it is happening maybe because of Bitmap.recycle() method but don't know the reason. Please correct me if I am wrong and point out the error here.

Edit: I must add the grid view shows around 50 downloaded images, but only the first three images are becoming unrecognizable.

Thanks.

would you please try `options.inSampleSize=3` before `decodeFile`. maybe you have memory problem. — Hana Bzh, Dec 04 '14 at 07:39
JPEG is a **LOSSY** compression format. Each time you resave an image, it **looses details**. Also this: `options.inPreferredConfig = Bitmap.Config.RGB_565;` **lowers the available colors** (16 bit). — Phantômaxx, Dec 04 '14 at 08:01
@HBizhi Tried it. Getting the same problem. I checked the downloaded images, and the first 3 images are unrecognizable. They are saved as they are shown in the after output. — Mohit, Dec 04 '14 at 08:04
@Der Golem yeah bit I am performing the same operations on all the images then why only the first three images are distorting. — Mohit, Dec 04 '14 at 08:06
MAybe the other ones are **better quality** (lower compression) in the beginning. The ones distorting might be **lower quality** (higher compression). Try to temporarily rename the non distorting ones to the names of the distorting ones, to see that they won't be distorted. — Phantômaxx, Dec 04 '14 at 08:14
I will try it. But I have 5 list of 50 image urls and whenever I change the urls, only the first 2-3 images are showing this problem, can't be a coincidence that only the first few images are always of lower quality. — Mohit, Dec 04 '14 at 08:22

score 0 · Answer 1 · edited May 23 '17 at 12:21

0

For getting your resized Bitmap you can use the below code: (taken from this tutorial)

public static Bitmap decodeSampledBitmapFromPath(String path, int reqWidth,
            int reqHeight) {

        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        options.inSampleSize = calculateInSampleSize(options, reqWidth,
                reqHeight);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        Bitmap bmp = BitmapFactory.decodeFile(path, options);
        return bmp;
        }

    public static int calculateInSampleSize(BitmapFactory.Options options,
            int reqWidth, int reqHeight) {

        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {
            if (width > height) {
                inSampleSize = Math.round((float) height / (float) reqHeight);
            } else {
                inSampleSize = Math.round((float) width / (float) reqWidth);
             }
         }
         return inSampleSize;
        }

You can also take a look at the official site for getting a hint on loading Bitmaps

Edit

Try to change bitmap configuration to ARGB_8888 for best quality

because RGB_565 configuration can produce slight visual artifacts depending on the configuration of the source (taken from docs)

Update

I think you can take a look at this answer , I think this would solve your problem

edited May 23 '17 at 12:21

Community

1
1

answered Dec 04 '14 at 08:38

Shubhang Malviya

1,525
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17

My code for resizing is working perfectly. My problem is with the image distortion happening to the first few downloaded images. – Mohit Dec 04 '14 at 08:50
Tried it, no changes. I think the problem is due to improper handling of `bitmap.recycle()` method – Mohit Dec 04 '14 at 09:35
can you add your save bitmap function? – Shubhang Malviya Dec 04 '14 at 09:54
@Mohit Meanwhile I've updated my answer ,plz take a look – Shubhang Malviya Dec 04 '14 at 10:00
I am using download manager. So it just consists of a few lines. `request.setDestinationInExternalFilesDir(....)` after initializing `DownloadManager` and `Request` – Mohit Dec 04 '14 at 10:01
Nope. I am already using all the methods the questions does, in my application I am downloading a total of 50 images but only the first few images are distorting. – Mohit Dec 04 '14 at 10:43
Have you tried to remove these options.inPurgeable=true; options.inInputShareable=true; and test? – Shubhang Malviya Dec 04 '14 at 11:01
I fixed the problem. It was because I was resizing the image to a lower resolution then they were. But why the only first few were distorting, I am still unable to understand. – Mohit Dec 04 '14 at 14:50

Image becoming unrecognizable

1 Answers1