Can PT Gui convert cylindrical images to equirectangular and HOW?

[VKNT]

Can PT Gui convert cylindrical images to equirectangular?

How should I do this?

Thanks in advance

[PTGui Support]

Hi Valentijn,

Yes, it can:

Start a new project. Load your cylindrical panorama as a source image.
Switch to Advanced mode, lens settings. Choose Cylindrical 360 degree.
Set a, b and c to zero.

Then go to the panorama editor and choose Projection: spherical (360x180
equirectangular).

Joost

[VKNT]

Thanks! It works.
At first it didn't. I was getting the following error:

"The PTGui stitcher does not support source images with a field of
view of 110 degrees or higher, and the installed version of Panorama
Tools is limited toa field of view of 150 degrees. To stitch these
images, you need to have a wide-angle capable version of Panorama
Tools installed."

But then I got the new pano12.dll from here:

http://www.photocreations.ca/panotools/
(I got pointed to it from panotools forum)

And it worked.

Joost, when I purchased PtGui, i remember downloading some panotools
from the ptgui site. Do i have to get the update from ptgui site
again? Cuz i suppose I have overridden that one now.

Best regards

[PTGui Support]

VKNT wrote:
> Joost, when I purchased PtGui, i remember downloading some panotools
> from the ptgui site. Do i have to get the update from ptgui site
> again? Cuz i suppose I have overridden that one now.

No that's not necessary, the version on Jim's site is newer.

Joost

[VKNT]

Ok, thanks!

[panostar]

Remapping cylindricals may not be quite as simple as Joost suggests.
The cylindrical image may have been cropped at the top or bottom, with
the horizon not centrally positioned. It's ok to input an uncropped
cylindrical image exactly as PTGui has generated it. If it has been
cropped not symmetrically, then some attempt should be made to restore
the cropped areas, albeit blank. Only then will the perspectives in
the equirectangular image be correct.

John

[VKNT]

Thanks John for that remark, I will pay attention to that.

[yuval levy]

--- panostar <j.hou...@ntlworld.com> wrote:
> If it has been cropped not symmetrically, then some
> attempt should be made to restore the cropped areas,
> albeit blank.

any idea how this could be achieved?

It is an interesting topic, I'll cross post to NG.

Yuv

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[panostar]

On Mar 28, 11:16 pm, yuval levy <yuval_l...@yahoo.com> wrote:

> any idea how this could be achieved?
>

If the horizon in the cylindrical is level and flat, it's just a
matter of extending the canvas to bring the horizon to the centre.
Measure the height from the horizon to the top or bottom (whichever is
the larger) and double it to get the new canvas size.

If the horizon is curved, then you will have to estimate the mid point
of the curve. There should be one hump and one trough like a sine wave
for the full 360 view.

John

[Philippe Laine]

Hi

Is there a way to neutralize a little part of image before PTgui
stitches the panorama (like creating a mask with a specific color
which will not be blended with the image). I tried with black, white
and grey - but if the grey is the better, it is not completely
satisfying.
... or in other words, how can I get control of the mask shape while
keeping the blending method of PTgui?

thanks

Philippe

[yuval levy]

--- Philippe Laine <cp...@wanadoo.fr> wrote:
> Is there a way to neutralize a little part of image
> before PTgui stitches the panorama

yes - use TIFF as input images and use the alpha
transparency layer.

Yuv

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[Pat Swovelin]

yuval levy wrote:

--- Philippe Laine <cp...@wanadoo.fr> wrote:

Is there a way to neutralize a little part of image
before PTgui stitches the panorama

yes - use TIFF as input images and use the alpha
transparency layer.

Just in case you don't know how to do that here's the workflow.  Select the area you want to mask (I find it easiest to switch to Quick Mask mode with "Q", paint the area I want masked and switch back out of Quick Mask mode with "Q") then click on the Channel tab and click on the "Save selection as channel" button at the bottom of the palette (it looks like a small circle).  When you save the file as a TIF that Alpha channel will be stored in the file.  When that image is used by PTGui it will ignore (even though you can see them) all of the area within the Alpha channel when it blends the images.

Obviously you'll be doing this for all of the images that have the head and tripod in them and your feet and legs in the nadir shot.  You can also use this to hide lens flares from the Sun or lights and other naughty bits you don't want to see and/or have to deal with later in the post-production process.

Yuv

Pat Swovelin
Cool Guy @ Large

[Philippe Laine]

Hi all

Many thanks to Yuval and Pat. It works now. I had tried with mask, but didn't use them correctly.

Thanks again

Philippe

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Le 10 avr. 07 à 03:25, Pat Swovelin a écrit :