Canon RAW: Combine .CRW and .THM files

[Olivier_G]

XnView can currently view+thumbnail .CRW and .THM created by Canon cameras in RAW format. It can also manage EXIF(+orientation) and IPTC for the .THM file.

Is it possible to manage both files as a couple:
- Show only 1 thumbnail (generated from the .THM)
- Manage the EXIF (image orientation, data) and IPTC through .THM
- Open/View/Preview from the .CRW
- Copy/Move/Rename/Delete... both files at the same time
?

Olivier

[helmut]

Think the problem I experience with my Canon IXUS 400 Camera is similar:
The camera allows for taking short videos which are stored as .AVI file. For each video, a file with the extension .THM is created. For the THM file XnView does not show a thumbnail.

When selecting the .THM file in the XnView browser, the image is shown in the preview window. It turns out that the .THM file is simply a JPG v1.1 file.

I surely could deactivate the option "Options > Browser > File List > Recognize only by extension", but this will slow down speed. Perhaps the .THM file should be supported by standard.

Not sure what the content of the .THM file is in your case. Perhaps it's also just a preview of the real image.

[Olivier_G]

The .THM file is a JPEG that contains most of the information (EXIF) and goes along the main file (CRW, AVI). Most people don't know what it is, and some actually delete it (+most of the information ).

It is best (and more convenient) to actually not show the .THM file, but just use its information.
... thus my suggestion to manage the .THM and the associated file as a couple in thumbnails mode...

Olivier
PS: I don't know how usefull this THM file is for AVI... but I can say that it is extremely important with CRW files.

[Olivier_G]

No reaction ?
It is a very convenient feature for digital photographers, though (BreezeBrowser, iMatch, etc... have implemented it). And my guess is that it will become a more and more popular feature...

Olivier

[xnview]

No reaction ?
It is a very convenient feature for digital photographers, though (BreezeBrowser, iMatch, etc... have implemented it). And my guess is that it will become a more and more popular feature...

Ok, i'll take a look how to implement this feature

[mr_munchie]

If this linking of Canon CRW and THM files could be made then could it be possible to include the EXIF data in the THM in a jpeg when you convert the CRW file. This way when you convert your CRW files to jpeg's you would have the EXIF saved in the jpeg. Currently I have to use Exifer software to do this and it is a manual process.

[helmut]

Perhaps a good start to support .THM files would be displaying them. Currently, the thumbnails are only shown if option "Recognize only by extension" is deactivated. As written above, they are simple JPG files.

[ruud]

ik kan het file tmp niet vinden erg ••• SPAM •••.

[NikoJorj]

- Manage the EXIF (image orientation, data) and IPTC through .THM

The problem is that the EXIF metadata is actually duplicated, in CRW and in THM - changing only one might give some out-of-sync situations.

I'd also like to be able to manage IPTC in my CRW files, but I'd think the safer way could be
- Read EXIF from the CRW (see this exiftool page) without writing anything,
- Write the IPTC in a third sidecar, preferably XMP for PS/LR/IVMP/PM compatibility?