|
|
Nick Karagiaouroglou
{K:127263} 6/7/2008
|
Hi Vandi!
Excuse me please for the confusion I caused. As I am quite anti-manipulative regarding images, a T/S must be something else than software, doesn't it? ;-)
A T/S is the abbreviation for tilt/shift. This kind of lens allows to tilt and shift the lens from lying parallel to the plane of the film or CCD. This can be used for correcting perspective in such a way that for example vertical lines are captured vertically instead of the usual optical distortion that makes them look not parallel on images taken with a wider angle. This can be a blessing for photography of architecture and for many other fields.
Why is that the only right way to correct perspective, everything else being only barbaric compared to that? Well, think about an image of a skyscraper taken from the down the street. Turning the camera upward will inherently make the vertical lines look as if they weren't vertical and parallel to each other. The skyscraper will appear as if its top was narrower than the base. Now, we take some software and "correct" that image. This means that the narrower top has to be streched. Was it 1cm on the original image, so now it has to be made, say, 2cm, along with all its patterns etc. Unfortunately the pixels of the image cannot be widened themselves. (Even if they could be widened this would introduce extreme pixelation.) So the additional space that is generated by widening has to be filled with something. Only... with what? On the image there is no available info about that, since it has a finite number of pixels there. For small corrections of perspective one can use some reasonable algorithm that "guestimates" what must be inserted "inbetween" and also keep a good degree of sharpness. But for corrections of more than some 3-4° the distruction of the image's fidelity is already visible. I attach a small sketch for a better understanding, but in general I must wonder about how easily such software is adopted without consideration whatsoever about the techniques involved.
Quite the contrary with a T/S. It optically brings onto the film or CCD what *is* since it optically "magnifies" some special part of the image, much like "selective gradual zoom".
For more info:
http://www.f-stop.com/p-c.htm
http://photo.net/equipment/canon/tilt-shift
http://www.northlight-images.co.uk/article_pages/tilt_and_shift_ts-e.html
Cheers!
Nick
|
Sketch |
|
|
|
Vandy Neculae
{K:7990} 6/6/2008
|
Hi Nick!
Please tell me what is 'T/S'(program)? If you refer to a photo transformation/deformation program, I think that there are some freeware photo editors to do that.
Best regards,
Vandi
|
|
|
|
|
Nick Karagiaouroglou
{K:127263} 5/27/2008
|
Thanks a lot for the nice comment once more, Dave! I think I also have some small preference for the horizontal image in terms of inclusion of the scene. This is one is better for more of the church on the image, but in this case the church alone doesn't have as much impact. It is where it stands that makes it more interesting, I guess.
Cheers!
Nick
|
|
|
|
|
Nick Karagiaouroglou
{K:127263} 5/24/2008
|
Thank you so much for your time, Vandi! I am really impressed of the attachment, since you kept the details and still you corrected perspective.
I need A T/S I guess, but they are extremely out of range for me.
Cheers!
Nick
|
|
|
|
|
Nick Karagiaouroglou
{K:127263} 5/24/2008
|
Thanks a lot for the nice comment, Ben!
Cheers!
Nick
|
|
|
|
Dave Stacey
{K:150877} 5/24/2008
|
Another excellent composition, Nick, and it shows the church off well. I think the exposure here is good for both shadow and highlight detail. I prefer the horizontal on this view though, just to include more of the scenic detail.
Dave.
|
|
|
|
|
Vandy Neculae
{K:7990} 5/23/2008
|
Very good picture, with lots of pleasant elements and details.
7.
I made some perspective corrections in attached image.
Best regards,
Vandi
|
|
|
|
|
Arben Mallaki
{K:10761} 5/23/2008
|
Fantastic!!!
|
|
0 
