Unknown field with tag 34665 (0x8769)

Discussion forum for Tawbaware's Star Tracer and Image Stacker software
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herbraab
Posts: 4
Joined: Tue Jun 28, 2011 3:43 pm

Unknown field with tag 34665 (0x8769)

Post by herbraab » Tue Aug 23, 2011 6:56 am

Hello,

I have been using ImageStacker for a while now, and I like it a lot. You may want to check out some star trails images I have created with this nice software on my flickr page at http://www.flickr.com/photos/herbraab/s ... 356143341/

Instead of using JPEG, I prefer to use 8bit TIFF images, concerted from Canon RAW files using Canon's Digital Photo Professional (Version 3.8.0.0). However, on reading these images, ImageStacker displays the message: "Warning, unknown field with tag 34665 (0x8769) ignored." Is that any problem, or is it safe to ignore this warning?

Somwetimes (not always) the resulting image after stacking such images is a corrupted image file that displays all green, while the result is OK when I convert the same images from RAW to JPEG. But I don't know if the problem is connected to the above mentioned warning, or if there is any other problem.

Thanks for your comments,
Herbert

maxlyons
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Joined: Fri Jun 20, 2003 8:55 pm
Location: USA
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Re: Unknown field with tag 34665 (0x8769)

Post by maxlyons » Wed Aug 24, 2011 9:06 pm

In general, warnings about unknown tags are harmless...it just means that the TIFF library doesn't recognize that TIFF tag. TIFF files can contain tags for all sorts of metadata, most of which can be happily ignored (e.g. GPS tags) as they are not relevant for the purpose at hand. Corrupted images are probably unrelated to the TIFF warnings, but if you can provide me with a set of files that produce corrupted output, I can investigate.

Max

herbraab
Posts: 4
Joined: Tue Jun 28, 2011 3:43 pm

Re: Unknown field with tag 34665 (0x8769)

Post by herbraab » Sat Aug 27, 2011 1:43 pm

Thank you, Max, for the reply. When I run into a corrupted stack the next time, I will try to make the individual frames available to you.

Thanks again,
Herbert

herbraab
Posts: 4
Joined: Tue Jun 28, 2011 3:43 pm

Re: Unknown field with tag 34665 (0x8769)

Post by herbraab » Sun Sep 02, 2012 5:49 pm

Hello Max!
maxlyons wrote:Corrupted images are probably unrelated to the TIFF warnings, but if you can provide me with a set of files that produce corrupted output, I can investigate.
Here is a set of two 16 bit TIFF files, reduces in size, packed in a 16 MB zip archive: http://www.astrometrica.at/Images/16bitTIFF.zip

These files were created from RAW files with the Adobe's Camera Raw tool. Stacking these images with Image Stacker 2.1.0.0 results in a corrupted output file, which display only one single color, no matter what blending option I select. Maybe you can check what goes wrong there. After converting the images to 8 bit TIFF files, stacking works just fine. Under difficult conditions, however, it would sometimes be enourmously helpful if one could use 16 bit TIFFs.

Thanks a lot!
Herbert

maxlyons
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Re: Unknown field with tag 34665 (0x8769)

Post by maxlyons » Sun Sep 02, 2012 6:49 pm

herbraab wrote:Here is a set of two 16 bit TIFF files...Stacking these images with Image Stacker 2.1.0.0 results in a corrupted output file
Yes. Image Stacker currently only supports 8 bit TIFF files.

Thanks,

Max

herbraab
Posts: 4
Joined: Tue Jun 28, 2011 3:43 pm

Re: Unknown field with tag 34665 (0x8769)

Post by herbraab » Sun Sep 02, 2012 7:49 pm

maxlyons wrote: Image Stacker currently only supports 8 bit TIFF files.
Any plans to add the possibility to stack 16 bit images?
Would be much appreciated!

Thanks,
Herbert

maxlyons
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Location: USA
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Re: Unknown field with tag 34665 (0x8769)

Post by maxlyons » Sat Sep 08, 2012 4:49 pm

herbraab wrote:Any plans to add the possibility to stack 16 bit images?
Would be much appreciated!

Thanks,
Herbert
No immediate plans, but it is on my list of likely upgrades for Image Stacker.

Max

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