Stitching Very Large Art Pieces

[Mike Randall]

> I am impressed and amazed at the speed and accuracy with which PT Gui
> Pro v13.3 Stitches overlapping shots of large art pieces. But I am
> puzzled by its inability to stitch very large pieces. If the camera
> covers the art edge-to-edge, the series of shots stitches virtually
> perfectly (for example, a 30-in x 72-in piece would require 5 or 6
> shots, would stitch amazingly fast - and would be prefect!). But if the
> piece is too large to shoot edge-to-edge (for example, 48-in x 48-in), the process requires one more
> step. Here is what I mean:
>
> 1. I take a series of shots along one edge of the art and stitch that
> together
> 2. Same, along the other edge.
> 3. Final step: stitch the two 'stitches' together. Here is where the
> results are disappointing.
>
> A recent project is a good example. The two halves of a 48-in x 48-in
> painting are very well done; straight and accurate, no distortion or
> 'bowing.' Then stitching those two halves together, PT Gui is unable to
> find control points, so I manually find them and stitch the halves - the
> resulting image is barrel-shaped. If I ask PT Gui to find more control
> points (it can, after I manually find some), it may find a large number
> like 60. Eliminating the worst and re-optimizing should improve the
> image but it doesn't.
>
> Each of the two halves appears as if it is a perfect photograph of that
> half - but PT Gui doesn't see it that way. If the two halves actually
> were 'perfect photos' PT Gui would no doubt stitch them perfectly.
> Puzzling! I can fix this in Photoshop, but it is time-consuming,
> tedious, and a bit annoying. Is there a solution?
>
> My camera is a Canon EOS 5DS R (50mpxl) and the lens is a Canon EF 100mm

[PTGui Support]

Hi Mike,

You should stitch all images in one go. Stitching them row by row will
not give good results, as you have observed. PTGui can handle multi row
panoramas just fine.

For the best results, use a long lens and take overlapping photographs
by keeping the camera and artwork at the same position and then rotating
the camera around its no-parallax point.

If you must move the camera or artwork please see 6.5:
https://ptgui.com/faq#6_5

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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