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Today's Topics:
1. Re: Subtracting from image (Joao S. O. Bueno Calligaris)
2. Re: Subtracting from image (Axel Wernicke)
3. Re: Subtracting from image (Rikard Johnels)
4. No JPG recognized on one host: 2.2.8 (Rich Shepard)
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Date: Wed, 24 Aug 2005 16:12:39 -0300
From: "Joao S. O. Bueno Calligaris" <[EMAIL PROTECTED]>
To: gimp-user@lists.xcf.berkeley.edu
Subject: Re: [Gimp-user] Subtracting from image
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On Wednesday 24 August 2005 14:54, Rikard Johnels wrote:
Hi all!
I have a "problem".
I have two images taken with a few seconds difference, and i want
to subtract the differences between them from one of them.
Its a crowded square, with people walking around, And i want to
"keep" all the stationary object, as benches etc, and remove the
things that have moved. Its a experiment to "enhance" pictures
taken for a panorama of populated areas.
Any pointers on where to look for a solution?
Well...for strcit "subtraction of an image" - the GIMP provides layer
modes taht do that.
Just open both your images as different layers on teh same gimp image,
and change the one on the layer above to "subtract" or "difference"
- that will do a subtraction on the RGB pixel value of each pixel.
That is not your intended final result. But from the "difference"
layer mode you should get everything that is fixed in place (ground +
benchs + billboards) in black or near black (with outlines since it
is little likely that the images will match exactly at pixel level),
with negative or otherwise color distorted sillouetes of the moving
objects (e.g. persons + dogs + vehicles) . You can then copy this
"silloueted" view with "copy visible" and paste it as another layer.
Then yoiu can try different ways of getting this "sillouete layer" to
the layer mask of the top image, to trying to let only the parts
where people appear transparent. You will need to work a lot to find
good combinations of operations to do on the layer masks (you will
have to blur + play with curves or levels on them)
I think what you desire would be easier with three instead of two
photos from the same place - or your sillouete layer will contain
data of people on both photos. With three photos you have to further
generate a second sillouete layer, and then combine both sillouetes
to generate a suitable mask for one of your layers.
It will requiere quite some experimenting - and I know this I am
writing must be sounding confuse. If you have three photos of the
same place, mail me (it can be reduced resolution version) of then,
and I might try to document all the steps in detail.
If you just have two images, send then anyway ... but it may be
harder.
Regards,
JS
-><-
/Rikard
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Date: Wed, 24 Aug 2005 22:43:51 +0200
From: Axel Wernicke <[EMAIL PROTECTED]>
Cc: gimp-user@lists.xcf.berkeley.edu
Subject: Re: [Gimp-user] Subtracting from image
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Am 24.08.2005 um 21:12 schrieb Joao S. O. Bueno Calligaris:
It will requiere quite some experimenting - and I know this I am
writing must be sounding confuse. If you have three photos of the
same place, mail me (it can be reduced resolution version) of then,
and I might try to document all the steps in detail.
If you just have two images, send then anyway ... but it may be
harder.
Yeees, and if it works, Joao makes short tutorial and puts it online =20
- - please. That is exactly the kind of stuff people need to get done =20=
with that tons of digital pictures we all take today :)
Seriously, I think after we got an almost complete GIMP reference =20
manual by now, we need to focus more and more to use cases like the =20
one from Rikard.
Regards,
JS
-><-
just my 2c Axel!
- ---
Live is like a chocolate box, you never know what you wanna get...
GPG Signatur auf http://wernicke-online.net/Impressum/ pr=FCfen
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Date: Thu, 25 Aug 2005 13:12:39 +0200
From: Rikard Johnels <[EMAIL PROTECTED]>
To: gimp-user@lists.xcf.berkeley.edu
Subject: Re: [Gimp-user] Subtracting from image
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On Wednesday 24 August 2005 22.43, Axel Wernicke wrote:
Am 24.08.2005 um 21:12 schrieb Joao S. O. Bueno Calligaris:
It will requiere quite some experimenting - and I know this I am
writing must be sounding confuse. If you have three photos of the
same place, mail me (it can be reduced resolution version) of then,
and I might try to document all the steps in detail.
If you just have two images, send then anyway ... but it may be
harder.
Yeees, and if it works, Joao makes short tutorial and puts it online
- please. That is exactly the kind of stuff people need to get done
with that tons of digital pictures we all take today :)
Seriously, I think after we got an almost complete GIMP reference
manual by now, we need to focus more and more to use cases like the
one from Rikard.
Regards,
I tried using a version of the technique used here:
http://www.photo.net/learn/dark_noise/
But it gave me odd results with partially see through ppl, and ghosts.
So maybe i didnt get it right.
Setup:
* Sergels Torg Square, Stockholm, Sweden. Tripod. camera set on manual
exposure to ensure same colorbalance, shutter, aperture etc.
* Take two shots of the same object in rapid succession. (Small timelapse)
* Swivel camera to the next segment of the panorama, with the same setting. *
* Shoot two pictures.
* Repeat until covered the whole pano field.
So far so good.
Next. Back tho the "digital photolab" and fire up gimp.
Project, to remove everything from the pictures except the stationary objects,
leaving an empty square. (With a few sitting/standing people.)
Stitch a panorama from the resulting edited pictures.
It is apparently harder then i thought to remove the "noise" of moving
objects.
/Rikard
------------------------------
Date: Thu, 25 Aug 2005 09:01:28 -0700 (PDT)
From: Rich Shepard <[EMAIL PROTECTED]>
To: gimp-user@lists.xcf.berkeley.edu
Subject: [Gimp-user] No JPG recognized on one host: 2.2.8
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Message: 4
This has me completely baffled. We run Slackware-10.1 on all hosts; each
had a copy of gimp-2.2.8 installed from the same package. On all but one
laptop, there is no problem opening and working with .jpg files. On this one
host, .hrz, .ico, and .jpg files are not recognized and not available in the
file type list.
I've removed and reinstalled the application, and moved ~/.gimp-2.2/ to
another name so it is regenerated when the application is invoked. No
difference in behavior: it will not accept .jpg as a valid file type.
ImageMagick's 'display' has no problem with them.
When I searched google for this problem I found a reference to a missing
library on freeBSD. On the host here, /usr/lib/libjpeg* are all present.
Suggestions and solutions greatly appreciated.
TIA,
Rich
