Computer Graphics with Photoshop - Changing perspective of image in PS?

Author

Changing perspective of image in PS?

Michael J.

2006-06-08, 6:17 pm

Greets all,

Are there any plugins or functions in PS (CS2) that will allow you to change the
perspective of an image, or object in an image? more complex objects such as cars and
the like?

Perhaps something like ImageAlign (http://www.dphoto.us/news/node/view/312) only
maybe a bit more powerful. For example, say I got a shot of a car at around a 30
degree angle from the side, and want it to look like the shot was taken more directly
from the side. I think traditionally this has been tediously done by making a
selection of the object and then using the free transform functions to play around
with it long enough to get a reasonably good looking final image.

As both a PS and Lightwave 3D user, I can tell you that for Lightwave there is a
plugin which will allow you to import a picture, draw a bunch of lines to match that
picture, and then slowly start building a 3D model based on that picture.

Although this would be much less complex in PS (as it need not be 3D), I figure there
has to be something like it for PS which will allow substantial perspective changes
of an image. Any advice or info much appreciated.

MJ

Avery

2006-06-08, 6:17 pm

On Thu, 08 Jun 2006 16:21:39 -0400, Michael J. <michaelJ@nospam.com>
wrote:

>Greets all,
>
>Are there any plugins or functions in PS (CS2) that will allow you to change the
>perspective of an image, or object in an image? more complex objects such as cars and
>the like?
>
>Perhaps something like ImageAlign (http://www.dphoto.us/news/node/view/312) only
>maybe a bit more powerful. For example, say I got a shot of a car at around a 30
>degree angle from the side, and want it to look like the shot was taken more directly
>from the side. I think traditionally this has been tediously done by making a
>selection of the object and then using the free transform functions to play around
>with it long enough to get a reasonably good looking final image.
>
>As both a PS and Lightwave 3D user, I can tell you that for Lightwave there is a
>plugin which will allow you to import a picture, draw a bunch of lines to match that
>picture, and then slowly start building a 3D model based on that picture.
>
>Although this would be much less complex in PS (as it need not be 3D), I figure there
>has to be something like it for PS which will allow substantial perspective changes
>of an image. Any advice or info much appreciated.
>
>MJ

Have you tried the vanishing point filter in CS2?

Michael J.

2006-06-11, 3:17 am

On Thu, 08 Jun 2006 22:09:20 GMT, Avery <Avery@home.sydney.au> wrote:

>Have you tried the vanishing point filter in CS2?

Actually this is one filter I've not done much with since having CS2. Would I be
correct in assuming that this is mainly a cloning filter, or is there more to it than
meets the eye?

Avery

2006-06-11, 3:17 am

On Thu, 08 Jun 2006 21:58:47 -0400, Michael J. <michaelJ@nospam.com>
wrote:

>On Thu, 08 Jun 2006 22:09:20 GMT, Avery <Avery@home.sydney.au> wrote:
>
>
>Actually this is one filter I've not done much with since having CS2. Would I be
>correct in assuming that this is mainly a cloning filter, or is there more to it than
>meets the eye?
>
>

I have't used it at all, but from what I have read it would seem to be
a possibility for what you want to do. It would probably mean
extracting your car image from the background onto a new layer,
setting up the perspectives you want and then remerging the layers -
or something like that.

http://studio.adobe.com/us/tips/tip...ml=phs9avrvanpt

or maybe something like this

http://www.humansoftware.com/pages1...HSsquizz11.html

Johan W. Elzenga

2006-06-11, 3:17 am

Avery <Avery@home.sydney.au> wrote:

>
>
> Have you tried the vanishing point filter in CS2?

'Vanishing Point' gives you the option to CLONE in perspective, not to
change the perspective of the whole image. 'Lens Correction' does that
(to a limited degree).

--
Johan W. Elzenga johan<<at>>johanfoto.nl
Editor / Photographer http://www.johanfoto.nl

Michael J.

2006-06-11, 3:17 am

On Fri, 9 Jun 2006 14:42:48 +0200, nomail@please.invalid (Johan W. Elzenga) wrote:

>'Vanishing Point' gives you the option to CLONE in perspective, not to
>change the perspective of the whole image. 'Lens Correction' does that
>(to a limited degree).

And actually one filter I forgot about was the 3D Transform filter. Have to give it a
shot.

Johan W. Elzenga

2006-06-11, 3:17 am

Michael J. <michaelJ@nospam.com> wrote:

> On Fri, 9 Jun 2006 14:42:48 +0200, nomail@please.invalid wrote:
>
>
> And actually one filter I forgot about was the 3D Transform filter. Have
> to give it a shot.

AFAIK, the 3D Transform filter doesn't give you the option to change the
perspective of the entire image either.

--
Johan W. Elzenga johan<<at>>johanfoto.nl
Editor / Photographer http://www.johanfoto.nl

KatWoman

2006-06-11, 3:17 am

"Avery" <Avery@home.sydney.au> wrote in message
news:sp7h82dl683n6m5bthbn6rb8fm00f55h5l@4ax.com...
> On Thu, 08 Jun 2006 16:21:39 -0400, Michael J. <michaelJ@nospam.com>
> wrote:
>
>
>
> Have you tried the vanishing point filter in CS2?

edit >transform >perspective?

Johan W. Elzenga

2006-06-11, 3:17 am

KatWoman <JolieXPrincessXKatanaXXX@hotmail.com> wrote:

>
> edit >transform >perspective?

Like already discussed: none of these techniques really changes the
perspective of the photo. All it does is distort the image a bit.
Changing the perspective means looking at the scene from a different
angle, and that simply cannot be done in Photoshop.

--
Johan W. Elzenga johan<<at>>johanfoto.nl
Editor / Photographer http://www.johanfoto.nl

Bart van der Wolf

2006-06-11, 3:17 am

"Johan W. Elzenga" <nomail@please.invalid> wrote in message
news:1hgp0dk.16vrhyq1b86z8wN%nomail@please.invalid...
SNIP
> Like already discussed: none of these techniques really
> changes the perspective of the photo. All it does is distort
> the image a bit. Changing the perspective means looking at
> the scene from a different angle, and that simply cannot be
> done in Photoshop.

Bingo, although it is possible to extract enough information to
construct a partial 3D image. In addition, the "Panorama Tools"
plug-ins will allow to, at least within limits, to re-project the
image onto either a flat (rectilinear), or other projection planes.

--
Bart

Johan W. Elzenga

2006-06-11, 3:18 am

Bart van der Wolf <bvdwolf@no.spam> wrote:

> "Johan W. Elzenga" <nomail@please.invalid> wrote in message
> news:1hgp0dk.16vrhyq1b86z8wN%nomail@please.invalid...
> SNIP
>
> Bingo, although it is possible to extract enough information to
> construct a partial 3D image. In addition, the "Panorama Tools"
> plug-ins will allow to, at least within limits, to re-project the
> image onto either a flat (rectilinear), or other projection planes.

True, but that is something different. Changing the perspective means
changing the position of the viewer in relation to the scene.

--
Johan W. Elzenga johan<<at>>johanfoto.nl
Editor / Photographer http://www.johanfoto.nl

philhxc

2006-06-11, 3:18 am

Michael J. wrote:
> Greets all,
>
> Are there any plugins or functions in PS (CS2) that will allow you to change the
> perspective of an image, or object in an image? more complex objects such as cars and
> the like?
>
> Perhaps something like ImageAlign (http://www.dphoto.us/news/node/view/312) only
> maybe a bit more powerful. For example, say I got a shot of a car at around a 30
> degree angle from the side, and want it to look like the shot was taken more directly
> from the side. I think traditionally this has been tediously done by making a
> selection of the object and then using the free transform functions to play around
> with it long enough to get a reasonably good looking final image.
>
> As both a PS and Lightwave 3D user, I can tell you that for Lightwave there is a
> plugin which will allow you to import a picture, draw a bunch of lines to match that
> picture, and then slowly start building a 3D model based on that picture.
>
> Although this would be much less complex in PS (as it need not be 3D), I figure there
> has to be something like it for PS which will allow substantial perspective changes
> of an image. Any advice or info much appreciated.
>
> MJ

crop tool and click on perpective on the top... ( tool properties ) ?

Johan W. Elzenga

2006-06-11, 3:18 am

philhxc <philhxc@XXXXXXXXXX> wrote:

> Michael J. wrote:
>
>
> crop tool and click on perpective on the top... ( tool properties ) ?

Yet another method that doesn't really change the perspective, but only
distorts the cropped image. It's good enough to make buildings straight,
but doesn't do what the OP asks.

--
Johan W. Elzenga johan<<at>>johanfoto.nl
Editor / Photographer http://www.johanfoto.nl

S Penzes

2006-07-10, 6:17 pm

Johan W. Elzenga wrote:
> philhxc <philhxc@XXXXXXXXXX> wrote:
>
>
>
>
> Yet another method that doesn't really change the perspective, but only
> distorts the cropped image. It's good enough to make buildings straight,
> but doesn't do what the OP asks.
>
>
I'm a bit confused by this comment. A change in perspective will
necessarily distort the image. If you're worried about distorting the
whole image versus a selection, try this:
- select your region (e.g. with lasso)
- Ctrl-T to bring up transform box
- hover over a corner and use Ctrl-Alt-Shift to create a perspective change.

moving a corner modifies scale
ctrl - moving a corner modifies the corner position
ctrl- alt moving a corner skews the image (e.g. the opposite corner moves)

Johan W. Elzenga

2006-07-10, 6:17 pm

S Penzes <penzes@drdc-rddc.gc.ca> wrote:

> I'm a bit confused by this comment. A change in perspective will
> necessarily distort the image.

Of course it does, but it's like saying: "Every cow is an animal, so
every animal must be a cow". The first is true, the second isn't.

Yes, using 'perspective' in crop will distort the image. But that's not
the point. The point is that this distortion isn't really a change in
perspective. At least not the way the OP wants. What the OP wants simply
isn't possible in Photoshop, because it would require 3D data that the
image doesn't contain. Photoshop is a 2D package, not a 3D package.

--
Johan W. Elzenga johan<<at>>johanfoto.nl
Editor / Photographer http://www.johanfoto.nl

S Penzes

2006-07-10, 6:17 pm

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Johan W. Elzenga wrote:
> S Penzes <penzes@drdc-rddc.gc.ca> wrote:
>
>
>
>
> Of course it does, but it's like saying: "Every cow is an animal, so
> every animal must be a cow". The first is true, the second isn't.
>
> Yes, using 'perspective' in crop will distort the image. But that's not
> the point. The point is that this distortion isn't really a change in
> perspective. At least not the way the OP wants. What the OP wants simply
> isn't possible in Photoshop, because it would require 3D data that the
> image doesn't contain. Photoshop is a 2D package, not a 3D package.
>
>
Gotcha. I couldn't see the forest for the trees. OP will either need
to rotoscope in XSI, Maya, Lightwave etc (making up data to create the
3rd dim), build a model in Solidworks, Inventor, etc (requiring a priori
knowledge of geometry) or live with the artificially altered geometry
arrived at by distorting a 2D image with a photo style manipulation tool.