Terrywoodenpic
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Panoramic projections and distortion.
I Thought it might be useful to demonstrate how a panorama of a room, taken with a 129° field of view, would be presented using some of the different Projections available in PTAssembler.
It is clear that the normal rectilinear projection can not cope at all well. Resulting in massive distortions at the limits of the field. (It would also be beyond the scope of a wide angle rectilinear lens)
The cylindrical version copes well with the relative proportions, but to do so, draws curves from what were straight lines. While this this acceptable in many landscape pans, it is not in interior or architectural photography. The same is true of the equi-rectangular projection which is only marginally different.
Recti-Perspective creates an image where all radial lines are straight, but all horizontal ones are curved. This is very useful in many architectural shots as a majority of the defined lines will appear straight and there is little, if any, size distortion at the extremes.
However the horizontals will appear slightly curved the further they are from the horizon.
In this particular pan, it was easy to correct for this using the liquefy tool in Photoshop, and using a suitably large sized bush, to remove the curves, in the window end wall.
For best effect this must be done in one movement. If it is not correct, revert and try again.
People have to accept that it is impossible to make a definitive projection of what is essentially a spherical wide field of view onto a flat surface with out any distortions.
The method shown is probably results in the least distorted looking image that can be achieved.
The photographs were taken with my Fuji Xe2 with 18-55 lens set at 18mm. The camera was mounted in portrait orientation on to my Nodal Ninja Mk3ll pan bracket, and directly on to the legs of my Manfrotto 055Pro B Tripod. The head was levelled by adjusting the tripod legs. Software for stitching was PTAssembler in full auto mode, up and until, the various projections were chosen.
pan-view-screen-web by Terry Andrews, on Flickr
A room rectilinear by Terry Andrews, on Flickr
B room cylindrical by Terry Andrews, on Flickr
C room equirectangular by Terry Andrews, on Flickr
D room recti-perspective by Terry Andrews, on Flickr
E room recti-perspective liquify by Terry Andrews, on Flickr
I Thought it might be useful to demonstrate how a panorama of a room, taken with a 129° field of view, would be presented using some of the different Projections available in PTAssembler.
It is clear that the normal rectilinear projection can not cope at all well. Resulting in massive distortions at the limits of the field. (It would also be beyond the scope of a wide angle rectilinear lens)
The cylindrical version copes well with the relative proportions, but to do so, draws curves from what were straight lines. While this this acceptable in many landscape pans, it is not in interior or architectural photography. The same is true of the equi-rectangular projection which is only marginally different.
Recti-Perspective creates an image where all radial lines are straight, but all horizontal ones are curved. This is very useful in many architectural shots as a majority of the defined lines will appear straight and there is little, if any, size distortion at the extremes.
However the horizontals will appear slightly curved the further they are from the horizon.
In this particular pan, it was easy to correct for this using the liquefy tool in Photoshop, and using a suitably large sized bush, to remove the curves, in the window end wall.
For best effect this must be done in one movement. If it is not correct, revert and try again.
People have to accept that it is impossible to make a definitive projection of what is essentially a spherical wide field of view onto a flat surface with out any distortions.
The method shown is probably results in the least distorted looking image that can be achieved.
The photographs were taken with my Fuji Xe2 with 18-55 lens set at 18mm. The camera was mounted in portrait orientation on to my Nodal Ninja Mk3ll pan bracket, and directly on to the legs of my Manfrotto 055Pro B Tripod. The head was levelled by adjusting the tripod legs. Software for stitching was PTAssembler in full auto mode, up and until, the various projections were chosen.
pan-view-screen-web by Terry Andrews, on FlickrA room rectilinear by Terry Andrews, on FlickrB room cylindrical by Terry Andrews, on FlickrC room equirectangular by Terry Andrews, on FlickrD room recti-perspective by Terry Andrews, on FlickrE room recti-perspective liquify by Terry Andrews, on Flickr
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