[E] [ enblend-Bugs-2885858 ] 16bit Tiff's containing preview imgs "stop" enfuse/enblend

[Enblend <enb...@li...>]

Bugs item #2885858, was opened at 2009-10-25 12:01
Message generated for change (Comment added) made by harryvanderwolf
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=696409&aid=2885858&group_id=123407

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: Internal error
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Harry van der Wolf (harryvanderwolf)
Assigned to: Nobody/Anonymous (nobody)
Summary: 16bit Tiff's containing preview imgs "stop" enfuse/enblend

Initial Comment:
16bit Tiff images sometimes contain small preview images. Canon camera's (can) do this for example, but also some programs (can) do this, also when converting from raw to 16bit tiff.
It means that the tiff contains actually 2 images: a "normal" 16bit image with an alpha-mask, and an 8bit thumbnail without an alpha mask. Enfuse/enblend can deal with multilayer tiffs and will compensate for differences in size (e.g. the thumbnail). However, it can't work with tiffs with and without an alpha-mask or with different bitdepths. This makes both enblend and enfuse stop.

enfuse mentions when running "enfuse -o pipo.jpg img_0141.tif img_0141_ds1.tif ":
enfuse: warning: input image "img_0141.tif" does not have an alpha channel;
enfuse: warning: assuming all pixels should contribute to the final image
enfuse: warning: input image "img_0141.tif" does not have an alpha channel;
enfuse: warning: assuming all pixels should contribute to the final image
enfuse: input image "img_0141.tif" has pixel type UINT8,
enfuse:   but previous images have pixel type UINT16 

enblend mentions when running "enfuse -o pipo.jpg img_0141.tif img_0141_ds1.tif":
enblend: input image "img_0141.tif" does not have an alpha channel

Both test images contain a 2912x4368 and 182x273 image.

Note: When using tiffsplit to separate the big ones from the previews, I can enblend/enfuse both sets without problem.

note 2: I can't generate the images from my camera or software and can't add them now. I have asked both owners if the images can be used for "bugfixing". I have no answer yet. I still filed the bug now as I think the issue will occur more and more when users are going to use these 16 bit tiff images, converted from their RAW images (as I understood: default Canon hardware and conversion software behaviour).



----------------------------------------------------------------------

>Comment By: Harry van der Wolf (harryvanderwolf)
Date: 2009-10-25 15:52

Message:
I received permission ("yes please do") from one of the users. As the
images are 146 MB (total) in size I can't upload them to SF. They can be
found at http://harryvanderwolf.dyndns.org/tmp/thrift/. I bzipped both
images. They are 2 "false bracketed" images from the same RAW Canon image.
It's from my resident server which doesn't have huge bandwidth. You can
off course only download one and copy it as that doesn't matter for the
process.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=696409&aid=2885858&group_id=123407