Victor Domingos wrote:

Hi!

Is there an easy way in GIMP to make corrections to those distortions that happen for instance, when we try to take a photo from a very high building (when the straigh edges get a bit rounded or inclined). I think there are some similar apps in wich we can do that by using a grid to distort the whole picture. Is there anything like that in GIMP?

Thanks in advance, Victor Domingos
http://lojamac.com/blog

I looked for this too and didn't find it. I blogged about it here where there's a
link to a tutorial about a way to do it in Hugin, but I had some problems with that.

So that's a possibility, but I'm still interested in hearing of Gimp ways to do it.

J

yes, it's called Perspective or "Change the Perspective of the layer or selection." it is on the main menu screen as a trapezoid. i've used it to correct keystoning of photographing a tall building, or a mural when photographed from off to the
side. it gives you a grid for reference and it's quite handy.

-rei

On Jun21 11:03, John Allsopp wrote:

Victor Domingos wrote:

Hi!

Is there an easy way in GIMP to make corrections to those distortions that happen for instance, when we try to take a photo from a very high building (when the straigh edges get a bit rounded or inclined). I think there are some similar apps in wich we can do that by using a grid to distort the whole picture. Is there anything like that in GIMP?

Thanks in advance, Victor Domingos
http://lojamac.com/blog

I looked for this too and didn't find it. I blogged about it here where there's a
link to a tutorial about a way to do it in Hugin, but I had some problems with that.

So that's a possibility, but I'm still interested in hearing of Gimp ways to do it.

J
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That won't really work for curvature caused by lens distortion, because the distortion is... curved.

On 6/21/07, Rei Shinozuka wrote:

yes, it's called Perspective or "Change the Perspective of the layer or selection." it is on the main menu screen as a trapezoid. i've used it to correct keystoning of photographing a tall building, or a mural when photographed from off to the
side. it gives you a grid for reference and it's quite handy.

-rei

Is there an easy way in GIMP to make corrections to those distortions that happen for instance, when we try to take a photo from a very high building (when the straigh edges get a bit rounded or inclined). I think there are some similar apps in wich we can do that by using a grid to distort the whole picture. Is there anything like that in GIMP?

Have a look at Grokking the Gimp, section 2.6.5 which deals with perspective correction.

Norman

Victor Domingos wrote:
>>> Is there an easy way in GIMP to make corrections to those distortions >>> that happen for instance, when we try to take a photo from a very >>> high building (when the straigh edges get a bit rounded or inclined).

John Allsopp wrote: >> I blogged about it here
>>

Rei Shinozuka wrote:
> yes, it's called Perspective or "Change the Perspective of > the layer or selection." it is on the main menu screen as > a trapezoid. i've used it to correct keystoning of > photographing a tall building, or a mural when > photographed from off to the
> side. it gives you a grid for reference and it's quite > handy.

Nice, corrects perspective, but doesn't correct lens distortion, if I'm right. Anyone re lens distortion that makes staight lines curved?

J

2007 m. birželis 21 d., ketvirtadienis 13:37, John Allsopp raš?:

Nice, corrects perspective, but doesn't correct lens distortion, if I'm right. Anyone re lens distortion that makes staight lines curved?

Maybye
Filter>glass effects>lens?

John Allsopp wrote:

Victor Domingos wrote:

Hi!

Is there an easy way in GIMP to make corrections to those distortions that happen for instance, when we try to take a photo from a very high building (when the straigh edges get a bit rounded or inclined). I think there are some similar apps in wich we can do that by using a grid to distort the whole picture. Is there anything like that in GIMP?

Thanks in advance, Victor Domingos
http://lojamac.com/blog

I looked for this too and didn't find it. I blogged about it here where there's a
link to a tutorial about a way to do it in Hugin, but I had some problems with that.

So that's a possibility, but I'm still interested in hearing of Gimp ways to do it.

One of the tools on the Gimp front panel toolset since at least 2.2 is the Perspective Tool (see also the Shear Tool) which does just that. There are some relevant instructions in my out of date version of 'Grokking the Gimp' in the Panorama and Transform sections; perhaps someone else can point you to more recent and better versions.

Doug

Hi !

You can try the Gimp Wideangle filter : http://members.ozemail.com.au/~hodsond/wideangle.html

Cheers,

Jeff

Hi!

Is there an easy way in GIMP to make corrections to those distortions that happen for instance, when we try to take a photo from a very high building (when the straigh edges get a bit rounded or inclined). I think there are some similar apps in wich we can do that by using a grid to distort the whole picture. Is there anything like that in GIMP?

Thanks in advance, Victor Domingos
http://lojamac.com/blog

I think in PS CS2 you can compensate (roughly) for actual lens distortions like barrel, pin-cushion, vignetting as well as key stoning (the last, you can do easily in GIMP)

This company claims to actually have distortion profiles and lots of lenses to do specific corrections
http://www.dxo.com/en/photo

ASJF wrote:

Hi !

You can try the Gimp Wideangle filter : http://members.ozemail.com.au/~hodsond/wideangle.html

Cheers,

Jeff

Hi!

Is there an easy way in GIMP to make corrections to those distortions that happen for instance, when we try to take a photo from a very high building (when the straigh edges get a bit rounded or inclined). I think there are some similar apps in wich we can do that by using a grid to distort the whole picture. Is there anything like that in GIMP?

Thanks in advance, Victor Domingos
http://lojamac.com/blog

Is there an easy way in GIMP to make corrections to those distortions that happen for instance, when we try to take a photo from a very high building (when the straigh edges get a bit rounded or inclined).

Yes, there is. However, you'll have to wait for 2.4 version (or install development version). Filters > Distorts > Lens Distort.

Alternatively, you can try Gimp Wideangle filter: http://members.ozemail.com.au/~hodsond/wideangle.html