If one qualifies that stitching error "big" or "small" depends on one's aspiration.

However, now I took a closer look at it. There is another error, which may be more difficult to correct without a decent stitcher program (Autostich is none; I don't know Panorama Maker 4, I used Version 3 and that sucked).

Anyway, the problem is with the setting of the horizon. How to judge that, when there is no visible horizon in the scenery?

I assume the concrete lamp posts are vertical. Scoll the image i bit to the right, until the first posts left edge is at the edge of the window. The post is leaning to the outside. Do this with the barrel of the building (at it's left edge): it is straight. At the right side of the barrel the verticals start to lean to the outside, and the rightmost lamp post is almost falling over to the right.

I created demos (previews of three frames from a large pano) demonstrating the effect of horizon setting.

The first demo shows the effect of horizon placed too high:

http://www.panopeeper.com/Demo/StitchingDemo_HorizonTooHigh.jpg

In the next image the horizon is set too low:

http://www.panopeeper.com/Demo/StitchingDemo_HorizonTooLow.jpg

and finally, when the horizon is set correctl:


http://www.panopeeper.com/Demo/StitchingDemo_HorizonCorrect.jpg

NOTE, that

1. the horizon is NOT NECESSARILY at the middle of the image,

2. horizontal lines are horizontal on a pano only seldom, for example when the top of the pano is the open sea, with the join of sea and sky. It is much more reliable to use vertical features to right the pano (if the verticals appear vertically, then the pano is correctly oriented),

3. incorrect setting of the horizon causes unmatching points/lines as well.

If you are interested in panos, you might want to visit Max Lyons' forums dedicated to panos at http://www.tawbaware.com/forum2 there you can ask and discuss fine details (and his stitcher, Panorama Tools Assembly is the best IMO and the cheapest among the professional ones).

--
Gabor

http://www.panopeeper.com/panorama/pano.htm