maemo.org - Talk - Camera and digital zoom

Quote:

Originally Posted by ossipena (Post 636243)

here's my 4mpix for comparision:
...
background etc is out of focus, white is burned through, ....

4 Mpix? N900 has 5 Mpix.

Background out of focus has nothing to do with pixel counts but with depth of sharpness -- and for many scenes from a camera with such a short focal length (about 5 mm) the depth of sharpness is far to long, with too many objects being within the focus range. So you photo is technically quite good: Motion blur but the seagull completely sharp ...

Well, I have done more specific tests: Indeed, the N900 zoom is a digital zoom without any additional pixels available. So the differences visible in the first samples must be related to image processing only. However, it is not understandable, why non-zoomed images are processed so much worse than zoomed images so that details show difference in image quality. Would be interesting to save camera raw images ...

The 2 images attached to this post are again:

Detail of an image taken with N900 zoom 1x but exploded by 3 at the computer
Detail of the same image taken with N900 digital zoom 3x

(The original was a sheet of white paper with just black lines on it.)

http://talk.maemo.org/attachment.php...1&d=1272746886

and

http://talk.maemo.org/attachment.php...1&d=1272746886

(PS: The differences between the 2 images of my first post are even bigger in the original files. Unfortunately, talk.maemo.org has converted the png files to jpg and thereby compressed heavily.)