Why does Bitmap get bigger when loading it from the res/drawable-mdpi folder?

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I developed an application where I download a JPEG image (size 184x274) from a URL. When downloading from the URL I get a bitmap of 184x274 pixels, that is to say it has the same dimension as the original image. If my original image is in the res/drawable-mdpi folder and using the following code: 

Bitmap imageFromRes;
imageFromRes = BitmapFactory.decodeResource(getResources(), R.drawable.imagem);
int hr = imageFromRes.getHeight();
int wr = imageFromRes.getWidth();

get hr = 552 and Wr=822, that is to say a 552x822 dimension and the image is 3 times larger than the original image. Why does this happen? Thank you

android bitmap

  • It would be possible to inform the URL of the image you are testing?

  • @Andréribeiro The URL used is this: http://alunos.deec.uc.pt/~a2008112913/image%20lida.jpg

  • This image is 274x184. It’s the original?

  • @Andréribeiro No, I put the original image in the res folder and got the width and height of the image using the following code: imageFromRes = Bitmapfactory.decodeResource(getResources(), R.drawable.imagem); int hr = imageFromRes.getHeight(); int Wr = imageFromRes.getWidth(); and I got a height of 552 and a width of 822... so I think these values are the correct ones of the original image. Thank you

  • I don’t understand. This link you sent is from the image generated or of original? I wanted to see the original image so I could test.

  • I downloaded the bitmap from the image URL, which is the same image I put in the res folder of my application. However in the bitmap obtained by download from the URL I got a dimension of 184x274 and in the bitmap obtained from the res folder using the code I put in the previous comment I got 552x822. The image in the res folder is the same image that is in this URL. Sorry if I didn’t make myself clear, I hope it is now explicit :) Thank you

  • Mark, edit your question and add this information. As it is written there it seems that your problem is quite another.

  • I’m sorry, I’ve already been able to confirm that the original image is 184x274! However using the code to load the bitmap, from the res folder the image is 552x822. But I don’t know why. Thanks I will edit.

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The dimensions returned on Android are proportional to the dpi of the used apparatus.

To check the original image size you can do as follows:

BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inScaled = false;
Bitmap imageFromRes = BitmapFactory.decodeResource(getResources(), R.drawable.imagem, opt);

With the option inScaled as false, the size returned is exactly the size of the image.

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