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Cathedral of Salzburg 1

Cathedral of Salzburg 1
Copyright ©2004, Admin MyOlympus
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The same as the other cathedral of Salzburg photo, this time with the perspective corrected, following Moshe's comment.

The high resolution original has a size of 3669 x 4605 pixel - that's 16.9 MP and is a stich of two 8MP images from the 8080. The resolution is a bit higher than 16MP (the sum of the resolutions of the individual images), because the top part of the image has been expanded as a result of the perspective correction.

Photographer: Admin MyOlympus
Folder: Alfred Molon
Uploaded: 14-Oct-2004 20:51 CEST
Current Rating: 7.00/1
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Model release available:
Camera: Olympus C8080
Exposure time: 1/400
Aperture: F/4
Focal length: 28mm (=7mm)
Focusing method: iESP P-AF
ISO: 50
White balance:
Flash: no
Image format: RAW
Processing applied: Panorama stich of two images; PTGUI (Panorama tools)
Image resized to: 720x574

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Alfred, the other one is more creative and this one has more distortion. Regards.

Gary Hebert at 04:50 CEST on 15-Oct-2004 [Reply]


In architecture photography with special professional cameras, they prevent perspective distortions by shifting the lens/film planes up/down, while keeping the film plane parallel to the object plane. Unfortunately we cannot do it with our cameras, so we must do it in Photoshop (in the darkroom days I used to tilt the easel).

I correct only vertical convergence (using the crop tool), this has the effect as if I shot from a high view point - opposite the object's center - while in fact I was at street level. I do not correct horizontal convergence, as this will have the effect of rotating the object and give an en-face view point, even if I stood on one side.

Depending on the amount of correction, I may distort the object's proportions and it may look too wide or too tall after the correction. In this case I apply Free Transform on the whole image, and squeeze vertically or horizontally, to restore correct proportions.

I do not have experience correcting panorama images. It's probably more difficult since each frame has it's own distortions, and they may conflict with each other.

In this particular image, I think the only problem is with the right turret which seems out of line with the rest of the building. Application of Transform-Skew to just the turret can solve the problem.

I uploaded two images I took last month, on a visit to Berlin (to Moshe Ronen 1 folder). In one I exaggerated perspective on purpose, to give the feeling of height and in the other I corrected perspective, as it seemed to me to be more appropriate.


Moshe Ronen at 09:36 CEST on 15-Oct-2004 [Reply]



with PTGUI you can easily adjust both perspective and projection. The projection can be rectilinear (as is the case here), cylindrical or spherical. You can adjust the perspective be moving a point on the image and by appyling a rotation.

See my other image (Cathedral of Salzburg 2) for a further variation.

Alfred Molon at 15:13 CEST on 15-Oct-2004 [Reply]