Re: [Gimp-user] GIMP throwing away TIFF tags

2007-02-13 Thread Sven Neumann
Hi,

On Mon, 2007-02-12 at 12:52 +0200, Paul Surgeon wrote:

 I have to touch up hundreds of aerial photos and it's a PITA to have to save 
 and then reapply the projection every time I save an image in GIMP.

We would accept a patch that changes the TIFF plug-in so that geographic
tags are attached to the image and saved with the TIFF file when it is
saved again. As long as this patch makes sure that GIMP doesn't alter
any information that is stored in these tags, that should be fine.


Sven


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Re: [Gimp-user] GIMP throwing away TIFF tags

2007-02-13 Thread Claus Cyrny
scott s. wrote:
 Paul Surgeon wrote:
   
 Ok so let's throw the tags away.
 Is there anyway to get GIMP to use libgeotiff instead of libtiff?
 libgeotiff is built on top of libtiff.
 I have to touch up hundreds of aerial photos and it's a PITA to have to save 
 and then reapply the projection every time I save an image in GIMP.

 Avenza Systems sell a Photoshop CS plugin called Geographic Imager that 
 handles GIS formats but it also does far more than what I need and am 
 willing 
 to pay for ($600).

   
 
 I also wish there was an option to keep Geotiff tags in images.  At 
 least the current
 version of GIMP I use only raises 3 errors, vs the many errors I got in 
 the past.
 IIRC the last time I asked about it I was told to write my own plugin.

 scott s.
 .

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Maybe 'listgeo' http://www.remotesensing.org/geotiff/listgeo.html
could help you on that. Found it via Google.
 
Claus

-- 
Home Page: http://home.arcor.de/ccyrny/ (Photographs)
Blog: http://grafomatic.twoday.net (in German)
Djangology http://home.arcor.de/ccyrny/djangology/ (my Django Reinhardt site; 
in German)


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Re: [Gimp-user] GIMP throwing away TIFF tags

2007-02-12 Thread Olivier Ripoll
Paul Surgeon wrote:
 Is there some way to tell GIMP to preserve TIFF tags even if they're not 
 known?
 If not can I file this as a bug? Tags shouldn't just be thrown away.
 
 Paul

Hi Paul,

To complement Sven's reply, I would just add that the TIFF 
specification, section 7, page 26, recommends that TIFF editors 
(applications that modify TIFF files) discards tags/fields/IFD they do 
not understand. To be more precise, the wording is:

It is unnecessary—and possibly dangerous—for an editor to copy fields 
it does not understand because the editor might alter the file in a way 
that is incompatible with the unknown fields.

Best regards,

Olivier

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Re: [Gimp-user] GIMP throwing away TIFF tags

2007-02-12 Thread Paul Surgeon
On Monday 12 February 2007 10:36, Olivier Ripoll wrote:
 To complement Sven's reply, I would just add that the TIFF
 specification, section 7, page 26, recommends that TIFF editors
 (applications that modify TIFF files) discards tags/fields/IFD they do
 not understand. To be more precise, the wording is:

 It is unnecessary—and possibly dangerous—for an editor to copy fields
 it does not understand because the editor might alter the file in a way
 that is incompatible with the unknown fields.

 Best regards,

 Olivier

Ok so let's throw the tags away.
Is there anyway to get GIMP to use libgeotiff instead of libtiff?
libgeotiff is built on top of libtiff.
I have to touch up hundreds of aerial photos and it's a PITA to have to save 
and then reapply the projection every time I save an image in GIMP.

Avenza Systems sell a Photoshop CS plugin called Geographic Imager that 
handles GIS formats but it also does far more than what I need and am willing 
to pay for ($600).

Paul
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Re: [Gimp-user] GIMP throwing away TIFF tags

2007-02-12 Thread scott s.
Paul Surgeon wrote:
 Ok so let's throw the tags away.
 Is there anyway to get GIMP to use libgeotiff instead of libtiff?
 libgeotiff is built on top of libtiff.
 I have to touch up hundreds of aerial photos and it's a PITA to have to save 
 and then reapply the projection every time I save an image in GIMP.

 Avenza Systems sell a Photoshop CS plugin called Geographic Imager that 
 handles GIS formats but it also does far more than what I need and am willing 
 to pay for ($600).

   
I also wish there was an option to keep Geotiff tags in images.  At 
least the current
version of GIMP I use only raises 3 errors, vs the many errors I got in 
the past.
IIRC the last time I asked about it I was told to write my own plugin.

scott s.
.

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Re: [Gimp-user] GIMP throwing away TIFF tags

2007-02-11 Thread Sven Neumann
Hi,

On Sun, 2007-02-11 at 20:47 +0200, Paul Surgeon wrote:
 Is there some way to tell GIMP to preserve TIFF tags even if they're not 
 known?
 If not can I file this as a bug? Tags shouldn't just be thrown away.

Who says so? Can you point me to the part of the TIFF spec that defines
how unsupported tags are supposed to be handled?


Sven


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