The curving horizontal lines are a result of mapping a very wide, three-dimensional view onto a flat surface, and create a view which we don't normally experience, and is therefore disconcerting. A wide panorama forces a view of the world that we don't experience directly. The OP's problem is not one of perspective correction, it is one of expectations. The fact that horizontal lines in wide panoramas are curved is "fundamental" to a cylindrical projection and any proper panorama program will do the same thing. PTGui isn't an image editing program, it does panoramas. I haven't tried PtGui but it seems the only time I hear about it in here is when someone can't get it to do something fundamental.
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getting your hands on a copy of Gimp or maybe Paint Shop pro (or even Photoshop for that matter). Just like you can't take the peel off an orange and lay it flat without creating some breaks, you can map a circular view of the world onto a flat surface without making some compromises. Other projections are available, but they are intended for even larger fields of view.Ī program called PTAssembler has some very useful hybrid projections which can make some types of wide views look more like rectilinear projections, with straighter horizontal lines. Mercator is a variation on cylindrical, which is what was used in the OP examples this is pretty much the best you can do with this wide a pano. You'll find that for a pano with as wide an angle of view as in the examples in the OP, that rectilinear will create an unacceptably distorted view.
Sure, try 'em out, it can be entertaining. Try the different projections and see how your image looks. Surely PTGui offers the user a choice of projections including rectilinear, Mercator, cylindrical and probably several others as well. So you are saying there is nothing to do ?īut it has not been a problem for me before ? this works for angles of view up to 90 to 120 degrees (depending on subject and taste), but beyond that it looks truly bizarre, and the cylindrical projection (or one of its derivatives) is necessary. It's just geometry, not a defect in your panorama or the software.įor panoramas with a more limited angle of view, a rectilinear projection can be be used, which corrects for this effect by progressively stretching the end of the pano up, down and out, like a bow tie. Think of it this way: the far corners of the building are further away, and thus would appear smaller less tall) if you looking at them, right? In order to show the closer walls (which appear taller) in the same scene as the further walls, a gradual transition must be made, which is accomplished by the curve you see. That's an unavoidable result of mapping a very wide view onto a flat surface with a cylindrical projection.
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Yes I know about the stichting errors and thats something I know how to fix What I want to straighten out is so all the horizontal lines are straight.
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