Re: [Gimp-user] photo stitching in the gimp

[Bruno Postle]

On Thu 03-Feb-2005 at 09:23 +0100, Olivier Ripoll wrote:
> 
> However, you are not obliged to use gimp for this. Hugin seems to
> have a nice interface that will probably make it easier than the
> plugins: http://hugin.sourceforge.net/

Definitely try hugin, this is currently the best option for
stitching panoramas on Linux.

Though the panorama tools gimp plugin does work with gimp-2, you
have to retrieve the latest CVS:

  http://panotools.sourceforge.net/

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Re: [Gimp-user] Re: Merge pictures??

[Bruno Postle]

On Thu 21-Jul-2005 at 23:43 +0200, Rikard Johnels wrote:
> 
> There is also http://www.ptgui.com/ for yet another way of doing it.

..or if you prefer to use free software, you can use hugin to
assemble scanned images:

  http://hugin.sourceforge.net/tutorials/scans/

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Re: [Gimp-user] Anti-Vignetting

[Bruno Postle]

On Sat 20-Aug-2005 at 06:07 +0200, Stephan Hegel wrote:
> 
> Recently I had to deal with a couple of images with signifcant
> vignetting in the corners: they were a few % darker. So, I was
> looking around for an adjustable anti-vignetting filter for Gimp,
> similar like that one for "digikam". Any idea ?

There is the radial luminance filter in the panorama tools gimp
plugin:

  http://panotools.sourceforge.net/

..but you might prefer to simply create a new layer over your photo,
fill it with a radial gradient (black in the middle and white in the
corners) and set the layer mode to 'multiply' or 'lighten only'.

Then you need to adjust the opacity of this layer until the picture
underneath looks right.  For a more refined technique, follow this
photoshop tutorial:

  http://homepage.ntlworld.com/j.houghton/vignette.htm

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Re: [Gimp-user] dcraw

[Bruno Postle]

On Tue 11-Oct-2005 at 19:57 +0100, Orlando Figueiredo wrote:

I am in great need of some detailed instructions to install the 
dcraw and the necessary plugins to open my Canon EOS350D *.cr2 
files.  I am using Fedora 4 and I already made a lot of trials


Dcraw is actually part of Fedora fc4 extras, you should be able to 
get it like so:


 yum install dcraw

(Though this doesn't give you any of the raw plugins for the gimp)

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Re: [Gimp-user] dcraw

[Bruno Postle]

On Wed 12-Oct-2005 at 14:44 +0100, Bruno Postle wrote:

Dcraw is actually part of Fedora fc4 extras, you should be able to 
get it like so:


  yum install dcraw

(Though this doesn't give you any of the raw plugins for the gimp)


For that you need ufraw:

 yum install ufraw

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Re: [Gimp-user] dcraw

[Bruno Postle]

On Wed 12-Oct-2005 at 19:00 +0100, Orlando Figueiredo wrote:

I went to Dave Coffin's home page  
 and I checked the list 
and the eos350d is there. So I am confused and do not know what 
the next step is?


Ok, I was having trouble with the old FC4 dcraw RPM too, so I've 
rebuilt a fresh one:


 http://bugbear.blackfish.org.uk/~bruno/apt/fedora/linux/4/i386/RPMS.panorama/

This is the command-line tool *not* the urfaw gimp plugin, so you 
need to use it in a shell like so:


 dcraw -w /path/to/myphoto.cr2

It will create an 8bit per channel ppm image in the same folder as 
the original, you can then open this with the gimp.


If you want to make use of the higher dynamic range of the RAW 
image, dcraw can output a 16bit per channel ppm instead.  Though if 
you want to edit it you have to use cinepaint or wait for the gimp 
developers to finish GEGL.


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Re: [Gimp-user] Howto composite over- and under-exposed images

[Bruno Postle]

On Sun 20-Nov-2005 at 09:23 +0100, Milan Knizek wrote:
> 
> is there an easy way to to take shadows from over-exposed image
> and highlights of under-exposed image and composite them together?
> (Assuming the two images are exactly the same, e.g. take from
> tripod or in a quick bracketing sequence.)
 
You can do it with layer masks:

  http://www.panotools.info/mediawiki/index.php?title=Contrast_Blending
  http://www.erik-krause.de/blending/
  http://www.luminous-landscape.com/tutorials/digital-blending.shtml

..or you can use an automated tool to build up a high dynamic
range composite:

  http://www.mpi-inf.mpg.de/resources/hdr/calibration/pfs.html
 
Cinepaint 0.20 has a plugin that does a similar thing.
 
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[Gimp-user] Perspective correction (was:doing with the gimp what www.scanR.com does)

[Bruno Postle]

On Tue 07-Feb-2006 at 21:46 +0800, peer miaskowski wrote:

Many of these pictures are photos of pages of books or photos of 
"whiteboard-drawings".  What I want to do is: correct/normalize 
the perspective and size of the images (best "automatically") so 
that it makes sense to archive and/or print them.


Does anyone have an idea how to do this. With the gimp? With 
another software?


Hugin can be used to correct perspective very effectively, but it 
isn't "automatic":


http://hugin.sourceforge.net/tutorials/perspective/

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Re: [Gimp-user] Miniature in top left corner when opening tiff images scanned with Nikon Coolscan V

[Bruno Postle]

Fredrik Israelsson wrote:

I am having trouble editing tiff images captured using Nikon Coolscan V. 
Gimp shows the image with a miniature of the same image added in the top 
left corner. I can't make it go away. This happens both on Linux and on 
Windows.


This is the preview thumbnail stored in the file by the camera, the 
Gimp interprets it as another layer so it appears on top.


Either delete the layer or tell the camera not to generate 
thumbnails in the first place.


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Re: [Gimp-user] HDR manipulation

[Bruno Postle]

On Fri 26-May-2006 at 12:17 +0200, Anastasios Hatzis (Hatzis 
Edelstahlbearbeitung) wrote:


Since I didn't find in the plug-in directory something I searched 
for (HDR) and didn't know other keywords for it, I like to ask in 
this list.


Are there any possibilities in GIMP or GIMP plug-ins to superpose 
multiple photos with different exposures into one new photo?


Cinepaint has a plugin for merging multiple exposures to HDR, 
otherwise you can do it on the command-line with pfscalibration:


http://www.bruno.postle.net/neatstuff/stained-glass-hdr-photo/

Though working with real HDR data is a hassle, you might have more 
success with a simple 'contrast blending' approach:


http://www.luminous-landscape.com/tutorials/digital-blending.shtml

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Re: [Gimp-user] High Dynamic Range (HDR) Images

[Bruno Postle]

On Fri 02-Mar-2007 at 15:32 -0700, Richi Plana wrote:
>
> Is it currently possible to make HDR images using The Gimp?

Not yet, the Gimp doesn't support the necessary floating-point data 
types.

You can assemble HDR images from bracketed photos using 
pfscalibration and apply tone-mapping operators with pfstmo and/or 
qpfstmo.  Alternatively cinepaint has a plugin for assembling HDR 
images from bracketed photos.

http://www.mpi-inf.mpg.de/resources/hdr/calibration/pfs.html
http://www.mpi-inf.mpg.de/resources/tmo/
http://theplaceofdeadroads.blogspot.com/2006/07/qpfstmo-hdr-tone-mapping-gui-for-linux_04.html
http://www.cinepaint.org/
http://freenet-homepage.de/hsbosny/HDR_Tutorial/HDR_Tutorial-en.html

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Re: [Gimp-user] gimp and subversion

[Bruno Postle]

On Mon 05-Mar-2007 at 10:59 +0100, Michael Schumacher wrote:
> Von: Bernhard D Rohrer <[EMAIL PROTECTED]>
>
> > has anybody ever thought about using Gimp with Subversion? I'd love a 
> > module that allows me to make sense of my edited versions of an image.

> Another, different approach could be to save the entire undo 
> history in the XCF file, see 
> http://bugzilla.gnome.org/show_bug.cgi?id=148930. This should 
> mostly eliminate the need for saving previous versions of images 
> except if you want them in a different format.

Øyvind Kolås in his GEGL video/talk suggested that the post-GEGL xcf 
format might be just a collection of single images tied-together 
with an XML file and stored in a zip container (like the 
opendocument format).

Unpacked into a folder, this format would be well suited for storage 
in a system like subversion - All that would be needed is for the 
gimp to be able to read/write the folder directly.

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Re: [Gimp-user] fuzzy logic possibly usefull to find almost perfect overlaps?

[Bruno Postle]

On Mon 16-Apr-2007 at 07:57 -0400, John R. Culleton wrote:
>>
>>   http://hugin.sf.net/
>>
>> These tools can be used together to streamline panorama generation
>> and can be used to create fabulous (and massive) wide-angle images.
>
> Are these tools useful for top-to-bottom merges or even diagonal 
> merges?

You can use them to stitch pictures in any arrangement (rows, 
columns, grids, random rotations, etc...) if that is what you mean.

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Re: [Gimp-user] Maps and sinusoidal projections

[Bruno Postle]

On Wed 02-Jan-2008 at 12:11 -0800, James Colannino wrote:
>
> Basically, I have a rectangular projection of a world map that I 
> want to convert to a sinusoidal map.  I looked around for plugins 
> that could do this, as well as other programs, but couldn't find 
> anything useful.

You could script this in the GIMP mathmap plugin:

http://www.complang.tuwien.ac.at/schani/mathmap/

Alternatively hugin can convert from equirectangular to sinusoidal projection:

http://hugin.sf.net/

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Re: [Gimp-user] How can I specify the tranformation matrix for a perpsective directly

[Bruno Postle]

On Mon, 2008-03-10 at 18:22 -0500, Leonard Evens wrote:
> I don't see a way to specify the matrix used to perform a desired
> perspective transformation manually.  Of course, I can adjust it by
> dragging handles, but it would be much easier for me to calculate what I
> need and then enter the elements of the matrix by hand.

Look for the gimp mathmap plugin, it does everything you need.

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Re: [Gimp-user] chromatic aberration

[Bruno Postle]

On Tue 18-Mar-2008 at 08:13 -0700, Simon Roberts wrote:
>
>Software can certainly help with this, and "that other product" has 
>this built in. Then again, you can buy a couple of really nice 
>lenses for the price you'll pay for that product ;>

Not an immediate solution, but 'over at the hugin project' we have a 
demonstrated technique for automatic correction of transverse 
chromatic aberration.  Sponsorship for turning this into an everyday 
tool is available under the Google Summer of Code:

http://wiki.panotools.org/SoC_2008_ideas#tCA_Correction

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Re: [Gimp-user] chromatic aberration

[Bruno Postle]

On Tue 18-Mar-2008 at 16:23 +, norman wrote:
>
>> http://wiki.panotools.org/SoC_2008_ideas#tCA_Correction
>
>This seems to assume that the optics are the cause of the CA whereas I
>understand that CA is also caused by the chip in e digital camera. Will
>this process take care of that?

Nope.

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Re: [Gimp-user] Is there a moustache distorion correction plugin for GIMP

[Bruno Postle]

There is the PanoTools gimp plugin, which uses the same 'panotools' 
lens correction parameters as hugin/lensfun/ptgui:

http://panotools.sourceforge.net/

..but this is old and full of irrelevant functionality.  These days 
a mathmap script would be simpler.

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On Wed 18-Mar-2009 at 05:02 -0700, Ken Warner wrote:
>I have a wide angle converter lens (Nikon WC63) that induces a
>mustache distortion.  I googled for a GIMP plugin that might
>be able to correct this distortion but didn't find one.
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Re: [Gimp-user] How to "clean" the photo of the paper with drawing?

[Bruno Postle]

On Thu 30-Sep-2010 at 18:59 +0200, Milan Vancura wrote:
>
> I tried to find tips how to "clean" a photo of the drawing but 
> with no success.  I have a photo of a paper with drawing (usually 
> a combination of heavy lines by marker and thin pencil ones) and 
> want to improve the image for printing. So I want to get white 
> background of 100% of the image (no shadows) and still have all 
> details of drawing kept. Even if they are sometimes lighter than 
> shadows in different part of the image. For example a dark shadow 
> in the cormer and light pencil line in the middle.

This is what I do:

Duplicate the layer and remove all the dark lines/text with the 
Dilate filter, repeat until they are all gone.

Gaussian Blur this duplicated layer with a large radius.

Effectively you want to subtract this duplicated layer from the 
original, do this by setting the layer Mode to Grain Extract, then 
Flatten.

The result will have an even grey background, adjust the Levels to 
make it white again.

This works very well, I use it for cleaning up photos of sketches, 
whiteboards etc...  There is an alternative method using a 
Convolution Matrix, but it doesn't get such good results for me.

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Re: [Gimp-user] Panoramic merging

[Bruno Postle]

<<< No Message Collected >>>
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Re: [Gimp-user] Photo stitch

[Bruno Postle]

On Sun 30-Mar-2003 at 07:29:32 +0200, Alf C Stockton wrote:
> 
> Is there any way to stitch photos together using the gimp ?

If you just want stick a couple of images together and need
something a little simpler than Panorama Tools, then you could try
the VIPS image processing tool, this has a photo stitching mode:

http://www.vips.ecs.soton.ac.uk/

Though if you want to seriously create 360 degree panoramas it's
worth while learning Panorama Tools; there is a very promising
open-source GUI front-end:

http://www.nic.fi/~juhe/ptbcbgui/

(this is Windows-only, but it works ok using Wine)

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Re: [Gimp-user] Fixing Hot/Stuck/Dead Pixels?

[Bruno Postle]

On Tue 01-Jul-2003 at 09:52:03PM -0400, Brian White wrote:
> 
> I have a digital camera which has developed a few stuck pixels and
> I'd like to automate the process of fixing them.

Try Jpegpixi:

http://jpegpixi.sourceforge.net/

"Jpegpixi" is short for "JPEG pixel interpolator". The intent of
the program is to interpolate pixels in JFIF images (commonly
referred to as "JPEG images"). This is useful to correct images
from a digital camera with CCD defects. For example, if one
pixel is always bright green, this pixel can be interpolated
away with jpegpixi.

Jpegpixi is unique in that it tries to preserve the quality of
the JFIF image as much as possible.

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Re: [Gimp-user] Panorama, panotools, ptools

[Bruno Postle]

On Thu 24-Jul-2003 at 11:13:58PM +1200, Robin Gilks wrote:
> 
> Take your pick of the flavour of plugin from the above - whatever
> its called I can't find any basic instruction on how to use it
> with the gimp.

> All I want to do is quickly and simply stick a few pix together
> with a bit more style than printing and then using Sellotape :-))

The panorama tools gimp plug-in is probably not what you need.
There are a couple of other simpler gimp plug-ins that do panoramas:

Pandora
http://www.shallowsky.com/software/pandora/

phfluuh
http://www.acc.umu.se/~janlert/phfluuh/

> A tutorial that doesn't launch straight into the positioning of
> controlpoints would be really good - can't find them documented
> anywhere either!

Hugin is a panorama stitcher gui tool that is developing fast and is
very nearly usable; it should be relatively easy to use, though it
*will* involve picking control points:

http://sourceforge.net/projects/hugin/

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Re: [Gimp-user] picture orientation

[Bruno Postle]

On Mon 03-May-2004 at 23:01 +0200, David Neary wrote:
> 
> When you open the image in the GIMP, that information is not used
> before presenting the image. And when you rotate the image, the
> exif header is not modified. So when you save your jpg again, the
> same exif header (saying that the image should be rotated 90
> degrees) is saved with the image.

> The only way to avoid this problem currently is to destroy the
> exif data saved in the header of your file. That way, your image
> viewer will not do any automatic adjustments based on it.

Photomolo/exifiron is a tool that can be used to batch rotate JPEGs
so they match the orientation data in the EXIF header:

http://www.funet.fi/pub/sci/graphics/packages/photomolo/photomolo.html

The transformation is lossless like jpegtran.

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