how do i straighten this?

soliberus · 4 Jun 2010

Hi everyone

I have this photo of Toronto and it's really bothering me that the CN Tower is not straight.

The horizon is pretty much straight, but how do I straighten the Tower as well?

Many thanks

neil_g · 4 Jun 2010

the horizon definately isnt straight

chivers67 · 4 Jun 2010

What software have you got at your disposal?

neil_g · 4 Jun 2010

its about 0.5 (ish - maybe 0.7 at a push?) degrees out in photoshop, but that doesnt straighten up the tower..

but then the lens has got a slight fisheye? the other buildings are on the wonk too.

http://farm5.static.flickr.com/4056/4668798480_df2ec99597_b.jpg

havent cropped it for illustration purposes.

Chappers · 4 Jun 2010

Not sure if you do this in elements, but it's fairly simple in Photoshop.

First Select All , then go to free Transform ( cmd/ctrl A... cmd/ctl T)

Now hold down the command./ control key and grab a top corner and drag that corner to straighten the image, repeat with the other corner to give a vertical tower

It does help if you expand the the canvas by simply dragging one corner to give you more room to work

cocker · 4 Jun 2010

Shiftn (free app) 1 Click gives this -:

soliberus · 4 Jun 2010

i use photoshop elements 7.

thank you cocker, that is the result i'm after.

Strangways · 4 Jun 2010

There is a perspection correction tool in Elements 7

soliberus · 4 Jun 2010

Thanks Gordon, I'll have a look tonight.

Danny_Two · 4 Jun 2010

If you have the ruler tool in elements, use that. Its hidden behind the eye dropper tool (maybe elswhwere in elements). Simply run the ruler along the horizon line, (or whatever image you wish to be straightened), then go to image> rotate canvas>arbitrary. Then ok that and it will straighten the edge.

Or if you're on a mac and have iphoto there is a straightener tool in there.

Skyviews100 · 4 Jun 2010

I use elements 7 and the tool you're after is on the left between the Cookie Cutter and the Red Eye Removal. Select this and draw a line along what you need to be horizontal.
You'll then either have to crop the image back to rectangular, or transform (Ctr+T) to resize it back to fill the original canvas.
There is an option to alter perspective, which is in >Filter>Correct Camera Distortion, but I don't use this very often.
Cheers

cargo · 5 Jun 2010

thanks for shiftn link.

Strangways · 5 Jun 2010

Skyviews100 said:
I use elements 7 and the tool you're after is on the left between the Cookie Cutter and the Red Eye Removal. Select this and draw a line along what you need to be horizontal.
You'll then either have to crop the image back to rectangular, or transform (Ctr+T) to resize it back to fill the original canvas.
There is an option to alter perspective, which is in >Filter>Correct Camera Distortion, but I don't use this very often.
Cheers

The perspective tool is under Image >transform >perspective. It is very straightforward and will do the crop if you specify it.