In my app I take a picture from camera and then I get that picture to do some image processing operations on same picture but when I get this picture with data.getExtras().g
Mightier nailed it. Without including extras you only get a small sized image. From the Android documentation:
public static final String ACTION_IMAGE_CAPTURE Since: API Level 3
Standard Intent action that can be sent to have the camera application capture an image and return it.
The caller may pass an extra EXTRA_OUTPUT to control where this image will be written. If the EXTRA_OUTPUT is not present, then a small sized image is returned as a Bitmap object in the extra field. This is useful for applications that only need a small image. If the EXTRA_OUTPUT is present, then the full-sized image will be written to the Uri value of EXTRA_OUTPUT.