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Old Jul 21, 2003, 7:00 PM   #1
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Default Arco della Pace in the Sunset

Let's do my first post in this new forum with this shot I have taken in Milan.
It shows a piece of the Arco della Pace in Piazza Sempione.
The shot has been taken pointing upwards.
The strong perspective has been corrected in PhotoShop.



Perspective correction has involved the following steps :
- canvas enlarge of about 40%
- perspective correction
- perspective correction in this case has created a upside down delta. Areas on the left and on the right have been backgound filled.
- so I had to recreate the sky parts, keeping the right gradient.
- I used the clone stamp , pressing Uppercase together with Alt in order to have both the original area and the stamp horizontally aligned.
- In the meanwhile my overclocked PC crashed cause it was too hot. :evil:
- So I had to restart again placing a big fan in front of it
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Old Jul 22, 2003, 12:04 AM   #2
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Sergio,

It sounds as if you spent as much effort creating this picture as the original builders had in making it.

The results are handsome but the perspective correction may have created a building that just doesn't look right. It is almost as if you are looking straingth at the building from a perch way up rather than from the ground as we normal humans do.

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Old Jul 22, 2003, 7:28 AM   #3
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Quote:
Originally Posted by selvin
Sergio,
The results are handsome but the perspective correction may have created a building that just doesn't look right.
Mmmhhh. You are right, Selvin !
When I created it this night there was something that didn't conviced me but I couldn't tell what it was.
It is something related to the outer columns !
I corrected the perspective trying to have a perfect rectangle in the middle around the bass-relief.
In doing so the outer columns are now diverging ! This can be noticed in the inner part of the outer columns : they make up a quite innatural 87-88 degree angle.
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Old Jul 22, 2003, 5:12 PM   #4
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This is the shot with a further perspective correction in order to fix the innatural look:



By the way, the original shot is the following :



That's why I preferred climbing up the perch
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Old Jul 23, 2003, 2:38 AM   #5
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I prefer the photoshop manipulated one. I do not mind that it feels that it is taken from a perch, since I prefer to go up the stairs of a neighboring building and try to take the photo right on instead of upwards towards a building anyway.

The first one fills the picture nicely.
And besides the perspective discussion, I must say that I am overly impressed with how you pulled it off in photoshop Sergio.
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Old Jul 26, 2003, 7:54 PM   #6
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One suggestion: when you correct the perspective you also need to compensate for the foreshortening effect caused by the angle of your original viewpoint. That means stretching the image vertically.

Here's one I did using Andromeda's perspective correction plugin. I then stretched it vertically by 25% - not knowing the monument, I'm not sure if that's correct, so I just tried to produce an image of the horse that didn't look squashed in either dimension. I suspect it could be stretched a little more!


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Old Jul 27, 2003, 7:54 AM   #7
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Quote:
Originally Posted by fenlander
One suggestion: when you correct the perspective you also need to compensate for the foreshortening effect caused by the angle of your original viewpoint. That means stretching the image vertically.
Thanx for the useful suggestion Fenlander , you are perfectly right.
And thank you for having posted your correction.

Is this plugin free ?
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Old Jul 27, 2003, 11:33 AM   #8
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You're welcome.

No, Andromeda plugins are not free. To be honest, they are no more effective than the perspective correction routines in PS or PSP - just a bit quicker. Of all the perspective tools I've tried, I think I liked the one in Photo-Brush best, and that program also has about the best pincushion correction I've found. Unfortunately, with Photoshop and Paint Shop Pro already on my PC, I couldn't justify buying another app just for those two functions.

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