Little DCU bug

**fs999** · 04-30-2019, 02:25 AM

I have found a little bug in DCU since at least 5 versions.
When exporting vertical (portrait) oriented DNG and PEF to 16bit TIF files, the orientation is always horizontal (landscape) when showing in Windows 7-10.
This is not the case when exporting to jpeg.

I tried with different software, only DCU produces this behaviour :

dt=Darktable
rt=Raw Therapy
o1=OnOne
ts=Topaz Studio
psp2019=Paint Shop Pro 2019

**UncleVanya** · 04-30-2019, 05:27 AM

Maybe look directly at exif to see if orientation flag is different in tiffs from dcu than from rhe other tools?

**fs999** · 04-30-2019, 06:03 AM

Originally posted by UncleVanya

Maybe look directly at exif to see if orientation flag is different in tiffs from sci than from rhe other tools?

That will not solve the problem

Kobayashi.K · 04-30-2019, 06:08 AM

I can't reproduce this bug (DCU 5.8.3, PSP X5, PSP X7).

Please check the following setting in DCU:

File | Save as ...
Or
File | Save as With Image Processing ...
Options | Tab Image rotation | change image rotation / Rotate the image data

**UncleVanya** · 04-30-2019, 06:22 AM

Originally posted by fs999

That will not solve the problem

It will however reveal if the orientation data is written and if so if there is a difference in what is written. It would give far more data for a bug report.

Or if none is written by dcu but others have a different outcome it would indicate a configuration issue.

**rogerstg** · 04-30-2019, 07:16 AM

Is it a DCU bug or Windows bug since it only seems to affect the thumbnail view in Windows folders? Thumbnail views in several other photo programs appear properly oriented.

---------- Post added 04-30-19 at 10:37 AM ----------

FWIW, I seem to remember the same thing happening when I saved as tiff in camera too.

stevebrot · 04-30-2019, 09:09 AM

IIRC, JPEG supports an orientation flag, while TIFF does not. EXIF has a orientation tag, but such is descriptive, not prescriptive. How software displays depends on the software and whether it retains display settings for each image in a database or sidecar file.

Steve

**fs999** · 04-30-2019, 11:22 AM

Originally posted by Kobayashi.K

File | Save as With Image Processing ...
Options | Tab Image rotation | change image rotation / Rotate the image data

Ok ! I changed to first then to second option and now it seems to be ok.

Originally posted by stevebrot

IIRC, JPEG supports an orientation flag, while TIFF does not. EXIF has a orientation tag, but such is descriptive, not prescriptive. How software displays depends on the software and whether it retains display settings for each image in a database or sidecar file.

When you look with Exiftool at the files, the DCU Tif file has an Orientation tag : Rotate 270° CW when the other have : Horizontal (normal), the imagewidth tag is 7360 and imageheight tag is 4912. The contrary of all other tif files...
The Jpeg doen't seem to be affected because they don't have imagewidth and imageheight tags, only ExifImageWidth and ExifImageHeight.
But now everything seem to be normal after changing the image rotation.

Thank you all for your help ! It was perhaps an old parameter of DCU 4...

04-30-2019, 02:25 AM	#1
fs999 Loyal Site Supporter Join Date: Jul 2008 Location: Luxembourg Photos: Gallery Posts: 8,638	Little DCU bug I have found a little bug in DCU since at least 5 versions. When exporting vertical (portrait) oriented DNG and PEF to 16bit TIF files, the orientation is always horizontal (landscape) when showing in Windows 7-10. This is not the case when exporting to jpeg. I tried with different software, only DCU produces this behaviour : dt=Darktable rt=Raw Therapy o1=OnOne ts=Topaz Studio psp2019=Paint Shop Pro 2019

04-30-2019, 05:27 AM	#2
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,401	Maybe look directly at exif to see if orientation flag is different in tiffs from dcu than from rhe other tools? Last edited by UncleVanya; 04-30-2019 at 06:23 AM.

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04-30-2019, 06:03 AM	#3
fs999 Loyal Site Supporter Join Date: Jul 2008 Location: Luxembourg Photos: Gallery Posts: 8,638 Original Poster	Originally posted by UncleVanya Maybe look directly at exif to see if orientation flag is different in tiffs from sci than from rhe other tools? That will not solve the problem

04-30-2019, 06:08 AM	#4
Kobayashi.K Veteran Member Join Date: Mar 2013 Photos: Albums Posts: 716	I can't reproduce this bug (DCU 5.8.3, PSP X5, PSP X7). Please check the following setting in DCU: File \| Save as ... Or File \| Save as With Image Processing ... Options \| Tab Image rotation \| change image rotation / Rotate the image data

04-30-2019, 06:22 AM	#5
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,401	Originally posted by fs999 That will not solve the problem It will however reveal if the orientation data is written and if so if there is a difference in what is written. It would give far more data for a bug report. Or if none is written by dcu but others have a different outcome it would indicate a configuration issue.

04-30-2019, 07:16 AM	#6
rogerstg Loyal Site Supporter Join Date: Oct 2007 Location: Rhode Island Photos: Albums Posts: 1,168	Is it a DCU bug or Windows bug since it only seems to affect the thumbnail view in Windows folders? Thumbnail views in several other photo programs appear properly oriented. ---------- Post added 04-30-19 at 10:37 AM ---------- FWIW, I seem to remember the same thing happening when I saved as tiff in camera too.

04-30-2019, 09:09 AM	#7
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	IIRC, JPEG supports an orientation flag, while TIFF does not. EXIF has a orientation tag, but such is descriptive, not prescriptive. How software displays depends on the software and whether it retains display settings for each image in a database or sidecar file. Steve

04-30-2019, 11:22 AM	#8
fs999 Loyal Site Supporter Join Date: Jul 2008 Location: Luxembourg Photos: Gallery Posts: 8,638 Original Poster	Originally posted by Kobayashi.K File \| Save as With Image Processing ... Options \| Tab Image rotation \| change image rotation / Rotate the image data Ok ! I changed to first then to second option and now it seems to be ok. Originally posted by stevebrot IIRC, JPEG supports an orientation flag, while TIFF does not. EXIF has a orientation tag, but such is descriptive, not prescriptive. How software displays depends on the software and whether it retains display settings for each image in a database or sidecar file. When you look with Exiftool at the files, the DCU Tif file has an Orientation tag : Rotate 270° CW when the other have : Horizontal (normal), the imagewidth tag is 7360 and imageheight tag is 4912. The contrary of all other tif files... The Jpeg doen't seem to be affected because they don't have imagewidth and imageheight tags, only ExifImageWidth and ExifImageHeight. But now everything seem to be normal after changing the image rotation. Thank you all for your help ! It was perhaps an old parameter of DCU 4...