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#1 2009-06-29 18:32:04

wjh31
Member
From: Surrey, UK
Registered: 2009-04-10
Posts: 458
Website

force resolution of longest focal length

very annoying, ive not had this problem before:

shooting at mixed focal lengths, tele for the details, with wide to fill in gaps (either accidental or in the featureless sky). Normally APP2 will correctly pick the resolution of the image as that of the longer focal length, but for once it's gone for that of the wide angle filler shots. Any ideas how to force it to take it from the tele shots?

TIA

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#2 2009-07-01 16:11:14

wjh31
Member
From: Surrey, UK
Registered: 2009-04-10
Posts: 458
Website

Re: force resolution of longest focal length

pretty please?

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#3 2009-07-01 17:03:43

AlexandreJ
Absolute beginner
From: Challes les eaux, France
Registered: 2005-11-14
Posts: 7631
Website

Re: force resolution of longest focal length

Really ? it should not. The maximal size of the panorama is always calculated on the resolution of the longest focal length.
So 100% means 1 pixel of the longest focal length is converted into 1 pixel on the final panorama.
Nevertheless, there might be some adjustment of that if the longest focal length image is not in the middle and you are using planar mode. In planar mode, at edges, the images can be distorted because of the projection. This facto is taken into account in this maximum size calculation. This may explain that behavior.

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#4 2009-07-01 17:11:46

wjh31
Member
From: Surrey, UK
Registered: 2009-04-10
Posts: 458
Website

Re: force resolution of longest focal length

ill try a few more details:

tele focal length is at 116mm 35mm equiv, wider angle is 36mm equiv. About 50 shots at the long focal length and two at the shorter focal length.
When i give APP2 all the images it puts them together fine in cylindrical projection at about 9000x3000 pixels, if i just give it the longer focal length images with no other changes to settings etc, it goes to about 30000x10000px again in cylindrical projection. Ive used this technique seveal times now and never had it do this.

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#5 2009-07-02 09:17:59

AlexandreJ
Absolute beginner
From: Challes les eaux, France
Registered: 2005-11-14
Posts: 7631
Website

Re: force resolution of longest focal length

This would be a case to share with us to study the calculation behind.

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#6 2009-07-02 10:53:07

wjh31
Member
From: Surrey, UK
Registered: 2009-04-10
Posts: 458
Website

Re: force resolution of longest focal length

ok i have stuck it in /incoming/TSquare.zip

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#7 2010-06-05 22:20:08

wjh31
Member
From: Surrey, UK
Registered: 2009-04-10
Posts: 458
Website

Re: force resolution of longest focal length

i was wondering if there was any further thoughts on this, i just had another one which didnt immediately go to the resolution of the longest focal length before a bit of editing, and often other panoramas will go from the longest focal length to a shorter one after editing with e.g the crop tool...

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#8 2011-02-17 21:42:09

Asher Kelman
Member
Registered: 2010-07-19
Posts: 71

Re: force resolution of longest focal length

What happened to this pano? The image were sent or not and what was the solution?

Asher


Journeys to the Masterpiece

"The Intimate Artistic Photography Forum"

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#9 2011-02-18 13:40:17

AlexandreJ
Absolute beginner
From: Challes les eaux, France
Registered: 2005-11-14
Posts: 7631
Website

Re: force resolution of longest focal length

The zip was corrupted and forgot about this case. Sorry.

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#10 2011-04-07 06:17:53

doc
Member
Registered: 2006-07-14
Posts: 14

Re: force resolution of longest focal length

I'm having the same problem, and can even reproduce it with 3 files.

With 2 images (one at 400mm, the other at 135mm) it works fine, and bases the resolution on the 400mm image as expected.

However adding a 3rd image (400mm) causes it to use the 135mm image as the base, and down-scales the other 2 images.

The three images, as well as a screenshot of the problem, are here

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#11 2011-04-13 08:23:08

Asher Kelman
Member
Registered: 2010-07-19
Posts: 71

Re: force resolution of longest focal length

doc wrote:

I'm having the same problem, and can even reproduce it with 3 files.

With 2 images (one at 400mm, the other at 135mm) it works fine, and bases the resolution on the 400mm image as expected.

However adding a 3rd image (400mm) causes it to use the 135mm image as the base, and down-scales the other 2 images.

The three images, as well as a screenshot of the problem, are here

So, what's the answer?

Is it possible that you could use multiple viewpoints as the entrance pupil will change for the different focal lengths?

Asher


Journeys to the Masterpiece

"The Intimate Artistic Photography Forum"

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#12 2011-10-15 11:45:22

doc
Member
Registered: 2006-07-14
Posts: 14

Re: force resolution of longest focal length

doc wrote:

I'm having the same problem, and can even reproduce it with 3 files.

With 2 images (one at 400mm, the other at 135mm) it works fine, and bases the resolution on the 400mm image as expected.

However adding a 3rd image (400mm) causes it to use the 135mm image as the base, and down-scales the other 2 images

I've just re-tested this with APG 2.6 beta 4, and it worked perfectly!

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#13 2011-10-17 11:22:30

AlexandreJ
Absolute beginner
From: Challes les eaux, France
Registered: 2005-11-14
Posts: 7631
Website

Re: force resolution of longest focal length

Excellent news Doc, thanks for feedback.

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