Yes Krishna, that’s what I want.
The thing is, a lot images have very vague and non-user-friendly names such as ‘img59595’. Since WordPress currently uses the image name as its alt attribute (and nothing for title if you left it empty when uploading), I bet it neither makes sense to search engines nor the users.
Using the same alt and title attribute for all images on a page may not be ideal, but it solves my problem.