Hello, all! I have created a patch to allow multi-layer images to be saved as multi-image TIFF's. This patch was coded against GIT trunk, and has been attached to the bug report.

https://bugzilla.gnome.org/show_bug.cgi?id=335975

First-timer here, so if I missed anything or did anything incorrectly, please let me know :)

Dominic Canare └ dom@domstyle.net

https://bugzilla.gnome.org/show_bug.cgi?id=335975

New patch uploaded today (sorry...). This version allows users to merge or flatten the image on export, if they don't want to save layers as pages. These options match existing functionality.

Dominic Canare └ dom@domstyle.net

On Tue, May 17, 2011 at 21:31, Dominic Canare wrote:

Hello, all! I have created a patch to allow multi-layer images to be saved as multi-image TIFF's. This patch was coded against GIT trunk, and has been attached to the bug report.

https://bugzilla.gnome.org/show_bug.cgi?id=335975

First-timer here, so if I missed anything or did anything incorrectly, please let me know :)

Dominic Canare └ dom@domstyle.net

What's the difference? Is there a benefit? When you open a multi-image TIFF in GIMP, it gives you the option of importing the images as layers, and that works just fine. I guess I just don't understand what that feature would provide for GIMP users (or anyone else, really).

If there's a real benefit (and you can point me to some documentation), I'd consider putting some energy into it. But honestly, good TIFF support seems to be in relatively low demand (this bug report was filed over 5 years ago!).

Dominic Canare
└ dom@domstyle.net

On Mon, May 30, 2011 at 10:45, Alexandre Prokoudine < alexandre.prokoudine@gmail.com> wrote:

On Wed, May 18, 2011 at 8:31 AM, Dominic Canare wrote:

Hello, all! I have created a patch to allow multi-layer images to be

saved

as multi-image TIFF's.

How about saving layers as layers in TIFF? It's "legal", but IIRC is an Adobe extension of TIFF.

Alexandre Prokoudine http://libregraphicsworld.org
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I think I was unclear about my misunderstanding, and maybe I was unclear about what my proposed patch does.

With the proposed patch, GIMP can export a layered image as a single, multi-image TIFF file. That is to say, each layer in the original will be saved as a separate image (or "page", if you prefer) WITHIN the TIFF file.

I hope I've cleared up any confusion. If not, hopefully you can clear up mine. I don't understand the difference between a "multi-layered" tiff and a "multi-image" tiff.

Dominic Canare └ dom@domstyle.net

On Tue, May 31, 2011 at 10:22, Alexandre Prokoudine < alexandre.prokoudine@gmail.com> wrote:

On Tue, May 31, 2011 at 7:04 PM, Dominic Canare wrote:

What's the difference? Is there a benefit? When you open a multi-image

TIFF

in GIMP, it gives you the option of importing the images as layers, and

that

works just fine. I guess I just don't understand what that feature would provide for GIMP users (or anyone else, really).

If there's a real benefit (and you can point me to some documentation),

I'd

consider putting some energy into it. But honestly, good TIFF support

seems

to be in relatively low demand (this bug report was filed over 5 years ago!).

Desktop publishing is one of the areas where it makes sense. E.g. Scribus can read multilayered TIFF files with clipping paths. The only other supported file format like that is PSD :)

In photography reading and saving multilayered TIFF files makes sense too -- you read it in the original report.

Finally, this is a question of being able to interact with the world outside. If a client asks you to save multilayered TIFF file for him/her, would you want to say "Sorry, can't do that, I use GIMP"?

Alexandre Prokoudine http://libregraphicsworld.org
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Right on, but I think we're saying the same thing, albeit with different nomenclature. Somebody please correct me if I'm wrong, but I believe that: Multi-layer = Multi-page = multi-image

And if I'm correct, this patch has exactly what you're looking for.

Dominic Canare └ dom@domstyle.net

On Wed, Jun 1, 2011 at 03:38, Øyvind Kolås wrote:

On Tue, May 31, 2011 at 11:31 PM, Dominic Canare wrote:

I think I was unclear about my misunderstanding, and maybe I was unclear about what my proposed patch does.
With the proposed patch, GIMP can export a layered image as a single, multi-image TIFF file. That is to say, each layer in the original will be saved as a separate image (or "page", if you prefer) WITHIN the TIFF

file.

I hope I've cleared up any confusion. If not, hopefully you can clear up mine. I don't understand the difference between a "multi-layered" tiff

and a

"multi-image" tiff.

Just to chime in on other software that also likes multi layered TIFFs,. hugin the free software panorama stiching tools (or at least some of the components it is built from) prefer such a format. If there really is one preferred way of doing this with TIFFs - I think should welcome a patch that implements it.

/Øyvind K. --
«The future is already here. It's just not very evenly distributed» -- William Gibson http://pippin.gimp.org/ http://ffii.org/