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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)
Lens:
Focusing method: iESP P-AF
ISO: 50
White balance:
Flash: no
Image format: RAW
Processing applied: Panorama stich of two images; PTGUI (Panorama tools)
Various:
Image resized to: 720x574

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interesting

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]

Perspective

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

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

PTGUI

Moshe,

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]